Tissue Types That Compose the Research Proposal

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Why are fat-soluble drugs more suitable for this type of delivery than drugs that are soluble in water?

Fat-soluble drugs are more suitable for skin diffusion than soluble drugs because they tend to be hydrophobic compounds, which facilitates their diffusion across the lipid membrane of skin cells. Water-soluble drugs are often hydrophilic and thus cannot easily diffuse through a hydrophobic milieu like the plasma membrane.

5. Which cutaneous glands are associated with hair follicles and what is their function?

The sebaceous glands are associated with hair follicles and function to secrete sebum (oil-like composition) into the follicular canal. Sebum helps to waterproof hair and skin, and it also serves to prevent cracking due to dehydration.

6. In which layer(s) of the epidermis does cell division occur?

Cell division occurs primarily in the stratum basale.

7. What is the function of the arrector pili muscles?

Arrector pili are bands of muscle which function to contract, causing hair to stand up on the skin, i.e. goose bumps. Relaxation of the arrector pili conversely reverses the process.

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8. A common misconception is that cutting your hair will make it thicker. Explain why this is not true.

Growth of hair is driven by stem cells located within the hair follicle itself, thus cutting the hair outside, which is not alive, should have no effect on the nature of the hair growing within the follicle. It is possible people believe the hair is thicker after cutting because it is shorter and therefore more rigid and rough feeling.

9. What critical metabolic function does the skin serve?

One critical metabolic function of the skin is to produce Vitamin D

10. One of the factors to which "lie detectors" respond is an increase in skin conductivity resulting from the presence of moisture. Explain the physiological basis for the use of this indicator.

Galvanic skin response, or skin conductivity, is thought to be the result of increased sweat production due to stress or emotional response. Individuals who are lying are presumed to be under greater stress than when telling the truth and therefore….....

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