Answer: d. helps to hold the lens and retina in place.
Explanation:
The vitreous humor is a clear and colorless fluid which helps in filling up the space between the lens and retina of the human eye.
The composition of the vitreous humor consists of 99% of water, rest composition includes the proteins, sugars and salts. It has a jelly like appearance. The vitreous humor remains in contact with the retina. The pressure created by the vitreous humor keeps the retina and lens at it's place.
Thus option d is correct.
A beer koozie is designed to keep a beer cold. The koozie is effective at blocking heat transfer from your warm hand into the cold beer and it also prevents condensation from forming on the side of the beer. Why does preventing condensation on a beer bottle keep the beer cool on a hot humid day?
Answer:
Water-vapour molecules give of their heat to convert into liquid water which is absorbed by the surface on which they condense.
Explanation:
Preventing condensation on the surface of a cold beer container will prevent the heat gain by the beer by absorbing the energy from the surrounding molecules of the water vapour present in the air in the form of humidity.When water vapour of the atmosphere which is present in the form of humidity condenses on the cold surface it releases the latent heat of vapourization to the cold surface of the container which is directly in contact with the beer which further absorbs the heat form the container.We know that the latent heat of vapourization of water is [tex]2260\ kJ.kg^{-1}[/tex] . This amount of heat is very high and can lead to gain of temperature considerably.Answer:
Water-vapour molecules give of their heat to convert into liquid water which is absorbed by the surface on which they condense.
The typical dosage of statin drugs for the treatment of high cholesterol is 10 mg.Assuming a total blood volume of 5.0 L and the density of blood in healthy individuals is approximately 1.05 g/mL, report the concentration of drug in units of ppm.
Answer:
1.904 ppm
Explanation:
Concentration of drug in units of ppm = mass of solute ÷ (mass of solution ) × 1000000
mass of blood = density of blood × volume = 1.05 g / ml × 5000 ml = 5250 g
mass of solution = mass of blood + mass of solute ( statin) = 5250 + 0.01 g = 5250.01 g
Concentration of drug in units of ppm = (0.01 g / 5250.01 g) × 1000000 = 1.904 ppm
Which of the following examples listed below illustrates homeostasis maintained by a negative feedback? Select one: a. Release of chemical signals by keratinocytes that have been damaged by UV light that will increase the production of melanin. b. The near waterproof secretions of glycolipids that is released by cells in the stratum granulosum. c. The secretion of antibacterial compounds in sebum. d. Removal of nitrogenous compounds like urea within the sweat.
Answer:
Option A, Release of chemical signals by keratinocytes that have been damaged by UV light will increase the production of melanin.
Explanation:
Negtaive feedback mechanism of homeostasis maintains the stability of any internal condition or function through lessening of output of a system or through slow down of a functional system.
Here in this case the keratinocytes function is reduced by damaging them on exposure to UV light which further triggers the release of chemicals that enhance the production of melanin.
Hence, option A is correct
An example that illustrates homeostasis maintained by negative feedback is the removal of nitrogenous compounds within sweat.
Explanation:The correct answer is d. Removal of nitrogenous compounds like urea within the sweat.
In homeostasis, the body maintains a stable internal environment. Negative feedback is a mechanism that helps maintain homeostasis by responding to a deviation from a set point and reversing the direction of change. In this case, the removal of nitrogenous compounds like urea within sweat is an example of homeostasis maintained by negative feedback.
When there is an increase in body temperature, such as during exercise, the sweat glands produce sweat that contains nitrogenous compounds like urea. This helps to cool down the body by evaporating from the skin's surface. As the body temperature decreases and returns to the set point, the production of sweat and nitrogenous compounds decreases as well, restoring homeostasis.
Learn more about Homeostasis here:https://brainly.com/question/31789146
#SPJ2
What is the active functional group on the drug that is most responsible for its potency? How does artemisinin achieve selectivity between healthy cells and pathogen infected cells?
Answer:
The active functional group of a drug is that one that has the most prominent quality of adherence to the corresponding group on the target site and this selective binding of the group gave the property of targeted therapy and action. The pharmacophore modelling is done to ensure the design success of a drug but real life circumstances are mostly unpredictable. By this specific targeted action a drug acquires the property of differentiating between healthy and infected cells. Infected cells always have something different in their functional group expression as compare the the healthy cells. This helps the drug to differentiate between them.
A person who visits the eye doctor is often given eye drops containing the drug atropine to dilate the pupils. A side effect of this drug is paralysis of the ciliary muscle, an effect called cycloplegia. Will a person with cycloplegia have difficulty with near vision or distance vision? Explain
Answer: the person with cycloplegia will have difficulty with near vision.
Explanation: Cycloplegia is the paralysis of the ciliary muscle which leads to loss of accommodation ( that is, loss in the ability to focus on an object as the distance varies) this occurs with topical application of atropine. Ciliary muscle is a smooth muscle at the vascular layer of the the eye that controls the shape of the lens.
Atropine is a cycloplegic drug that is used by eye doctors during eye examination to:. - better visualize the retina and to
-determine the true refractive error of the eye. This application by the doctor wears off with hours after the eye examination.
Paralysis of this muscle can lead to inability to adjust the curvature of the lens to focus on nearby objects. I hope this helps. Thanks.
Skin, lung, and blood vessel walls have which tissue characteristic in common? Select one: a. simple squamous epithelium b. simple columnar epithelium c. reticular fibers d. elastic fibers
The common tissue characteristic between the skin, the lung, and the walls of blood vessels is simple squamous epithelium. This tissue facilitates processes such as filtration and diffusion. Hence, it aids in the efficient exchange of gases, nutrients, and waste materials. So, the correct option is a.
Explanation:The skin, lung, and blood vessel walls all have the tissue characteristic of simple squamous epithelium in common. This type of tissue is made up of a single layer of flat cells that have a smooth surface appropriate for reducing friction, and enhancing the process of filtration and diffusion. It's the kind of tissue that lines the alveoli in the lungs, capillaries and other small blood vessels, and the skin. This makes it an ideal tissue for the exchange of gases, nutrients, and waste materials.
Learn more about Tissue Characteristics here:https://brainly.com/question/33447829
#SPJ2
Why is physical treatment of the wastewater important as a treatment prior to chemical or biological treatment?
Answer:
The most common method of treatment of wastewater is known as the biological method of wastewater.
The biological method of waste is performed in three stages called treatment in which the primary treatment is known as physical treatment.
During the physical treatment, the wastewater is treated physically by making a slope with the filters. The filters remove the large-sized debris and the plastic waste from the wastewater which does not become a problem during the biological treatment.
The antidepressant fluoxetine (or Prozac) has a half-life of about days. What percentage of a dose remains in the body after one day?
The complete question is :
The antidepressant fluoxetine (or Prozac) has a half-life of about 3 days. What
percentage of a dose remains in the body after one day
Answer: 79.4 per cent.
Explanation:
Half life of a substance can be defined as the amount of time taken to degrade it half or it can be defined as the time which is required by the substance to become half of its original amount.
Here we need to find the half life of a medicine fluoxetine.
The equation which can be written for the question is :P(t) which will provide the information about the amount of medicine left in the body after one day or time (t)
Since the half-life is 3 days, P(t) = 2 −t/3.
Then P(1) = 2 −1/3 ≈ 0.794 = 0.794*100=79.4% is the amount of substance left in the body after one day.
A message to drink is sent when Select one: a. too little ADH is detected by the kidneys. b. the kidneys detect too much glycogen. c. ADH is detected by the hypothalamus. d. angiotensin is detected by the hypothalamus.
Answer: d. angiotensin is detected by the hypothalamus.
Explanation:
Angiotensin is a hormone which causes the narrowing of the blood vessels. This helps in maintaining the blood pressure and also maintains the fluid balance in the body. The hormone acts on the brain. This hormone binds to the hypothalamus gland of the body, it stimulates the thirst and increases the demand for water intake. It also stimulates the release of antidiuretic hormone by the pituitary gland to increase the concentration of urine by preventing water loss.
Which opiate causes euphoria, relaxation, drowsiness, and detachment from reality and has possible effects on the pregnancy, including preeclampsia, intrauterine growth restriction, and premature rupture of membranes?
Answer:
Heroin (opiate) causes euphoria, relaxation, drowsiness, and detachment from reality and has possible effects on the pregnancy, including preeclampsia, intrauterine growth restriction, and premature rupture of membranes.
Explanation:
OPIATES are a group of CNS drugs which include :
1) Heroin.
2) Meperidine.
3) Methadone.
4) Codeine.
5) Buprenorphine.
They act on number of receptors in order to produce their effects especially analgesia.
Heroin can cause following signs and symptoms :
1) Analgesia ( relief from pain ) : by increasing pain tolerance and decreasing pain perception.
2) Euphoria and relaxation : Heroin changes back to morphine in the brain , acts on opiod receptors and produce euphoria and relaxation.
3) Detachment from reality : As the prolonged use of heroin can change the functional level of the brain, it causes detachment from reality.
Effects on pregnancy ( Preeclampsia , intrauterine growth restriction and premature rupture of membranes ) : These effects occur with heroin because it crosses the placental membrane and causes the relaxation ( inhibition of uterine contractions ) and also causes respiratory depression in the newborn. Hence opiates are strongly prohibited in pregnancy.
The nursing instructor is pointing out the various complcations which can occur during pregnancy in women with diabetes mellitus. The instructor determines the session is successful after the students correctly choose which complication that can occur if the diabetes is not kept under control
Answer:
The nursing instructor is pointing out the various complcations which can occur during pregnancy in women with diabetes mellitus. The instructor determines the session is successful after the students correctly choose which complication that can occur if the diabetes is not kept under control?
A. hydramnios
B. hypotension
C. Placenta previa
D. Cerebral Vascular accident
Explanation:
Out of control diabetes can result in hyperglycemia which tend to lead to excessive amniotic fluid( hydramnios or poly hydramnios) because of Osmotic presure fluid shifts. A small placenta is more common than placenta previa. the woman may experience hypertension verus hypotension if the diabetes is not controlled. cerebral vascular accidents are usually not related to diabetes but to circulatory issues.
Ovulation typically produces just one egg per cycle. Why does ejaculate contain more than just one sperm?
Explanation:
The female reproductive system produces one egg cell every month but males can ejaculate about 50 million sperm cells to fertilise one egg cell as:
1. The sperms released from the males are killed by the acidic nature of the cervix due to the acidic secretion of the female reproductive structure.
2. The sperms get trapped in the structure of the cervix which reduces the chances of reaching the egg cell.
3. only a few sperms reach the egg cell out of which only one sperm cell fuses with the egg cell and the rest are degraded by the system.
Thus, male ejaculate a large number of cells.
Cochlea implants could consist of: Select one: a. a percutaneous plug b. both a percutaneous plug and magnetic couplings c. magnetic coupling d. isometric coupling
Answer:Cochlea implants could consist of both a percutaneous plug and magnetic couplings. Correct option is B.
Explanation: Cochlea implants are hearing aids which are surgically implanted to provide a person with moderate to profound sensorineural hearing loss, a modified sense of sound. The implant has two components:
- percutaneous plug: This makes up the outside component which is generally worn behind the ear.
-magnetic couplings. This makes up the inner component which is generally implanted inside the skull.
Hope this helps. Thanks.
Which organization is responsible for the continuation of defining, explaining, classifying, and researching summary statements about health problems related to nursing?
Answer:
The North American Nursing Diagnosis Association-International (NANDA-I)
Explanation:
NANDA International (formerly the North American Nursing Diagnosis Association) is a professional organization of nurses interested in standardized nursing terminology, that was officially founded in 1982 and develops, researches, disseminates and refines the nomenclature, criteria, and taxonomy of nursing diagnoses.
Nerve fibers from all regions of the retina converge on the ___ and exit the eye by way of the optic nerve.
Answer: Optic Disc
Explanation:Optic Disc is a portion of the eye,it can be seen as black spot on the eye,it doesn't contain rods. Optic disc is the point of exit for optic nerve.
The optic disc is also known as the optic nerve Head,it is made up of connective and elastic tissue, it is the passage to the nerve fibre bundles and retinal blood vessels it also maintain intra-ocular pressure against a gradient between the intra-ocular and extra-ocular spaces.
Answer:Nerve fibers from all regions of the retina converge on the optic disc and exit the eye by way of the optic nerve.
Explanation: The eye is part of the sense organs which is used for visual purposes. It is made up if different parts that aid to achieve its visual functions, they include:
Lens, retina, optic nerve, cornea and many among others.
The images that are reflected through the len on the retina is converted into a set of electrical signals, and these signals are transmitted to the brain through complex neural pathways that connect the eye via the optic nerve to the visual cortex and other areas of the brain.
The optic nerve is made up of ganglion cell axon while the optic disc represents the beginning of the optic nerve and is the point where the axons of retinal ganglion cells come together. I hope this helps, thanks.
What effect will the calcitonin injections have on the calcitonin-treated rat’s vertebral bone density?
Answer:
The answer is - The calcitonin injections will increase the rat's vertebral bone density (indicated by a less-negative T score)
Explanation:
Calcitonin is produced in the thyroid gland by the parafollicular cells. It is a hormone which prevents the development of osteoporosis by reducing bone resorption and is known to increase bone density. Administering calcitonin to the rats resulted in their T score becoming less negative compared to the control rat therefore showing that it reduced the progression of osteoporosis.
A farmer's long-term exposure to pesticides has made the cells in his alveoli and bronchial tree susceptible to malignancy. Which of the following processes has taken place in the farmer's lungs?A) PromotionB) ProgressionC) InitiationD) Differentiation
Answer: Initiation
Explanation:
The farmers cell has be initiating its susceptibility towards the pesticides. The farmer if continues working in the field then he will develop the disease.
This susceptibility has developed because the cell has been in long term exposure to the pesticides as he works in the field.
The cells of the body lacks natural and fresh environment which is replaced with dirty and pesticides.
The [α] of pure quinine, an antimalarial drug, is −165. If a solution contains 69% quinine and 31% of its enantiomer (ee = 38%), what is [α] for the solution?
Answer: The required [a] for slotion will be -62.7
Explanation:
The specific rotation of pure quinine= -165
% of pure quinine= 69%
% of its enantiomer=ee=31%
Enantiomer excess =(ee)=excess of a single enantiomer/entire mixture×100
Now,
Excess of a single enantiomer=69% - 31%=38%
Entire mixture=69% + 31%= 100%
(ee)=38/100 × 100
=38%
Net rotation= 0.69-0.31=0.38
Hence, [a] for solution will be = -0.38×165= -62.7
According to the __________ strategy, fertility is a pattern of behavior tied closely to the institutional and organizational structure of society. Select one: a. family planning b. societalist c. coercion d. developmentalist