Chapter 5. module 2 A&P1 (M2A3, lecture)

Which hormone, released during times of stress, can loosen the connections between keratinocytes?

glucocorticoids

All of the following are true of the dermis EXCEPT that __________.

the hypodermis is part of the dermis

What mode of secretion do the eccrine sweat glands utilize?

merocrine

What is the initial response of the skin to being exposed to the ultraviolet rays of sunlight?

Epidermal cells produce cholecalciferol.

What are the primary effects of calcitriol on the body? Check all that apply.

Increase blood concentration of phosphorus. Increase blood concentration of calcium.

According to the textbook, which of the following organs is stimulated by calcitriol?

Small intestine

Several hours after an injury to the skin and a scab has formed, cells from which integumentary layer undergo rapid divisions and begin to migrate along the edge of the wound?

cells of the stratum basale of the epidermis

Patterns established by these fibers determine the lines of cleavage.

collagen and elastic fibers

What is the composition of the nail body?

dead cells

With aging, hair turns gray or white due to which of the following causes?

decreased melanocyte activity

Immediately after an initial injury to the skin, bleeding and __________ occur.

mast cell activation

In dark-skinned individuals, __________.

the melanosomes are more numerous