Question

question 1 (mandatory) (0.5 points) the skin plays a role in regulation of body temperature, when environment is cool and body heat must be conserved, arterioles serving the skin __ so that blood bypasses the dermal __ networks temporarily? a) constrict, capillary b) dilate, capillary c) constrict, papillae d) dilate, papillae question 8 (mandatory) (0.5 points) these cells produce a brown - to - black pigment that colors the skin and protects dna from ultraviolet radiation damage. these cells are: a) melanocytes b) keratinocytes c) dendritic cells d) tactile cell

Explanation:

Question 1 (Temperature Regulation)

To conserve body heat in a cool environment, dermal arterioles serving the skin's capillary networks constrict. This reduces blood flow to the skin's surface (bypassing capillary networks temporarily), minimizing heat loss. Dilating would increase blood flow and heat loss, and papillae are not related to blood vessel regulation for heat conservation.

Question 8 (Skin Pigment Cells)

Melanocytes are the cells that produce melanin, a brown - to - black pigment. This pigment colors the skin and protects DNA from ultraviolet radiation damage. Keratinocytes are involved in producing keratin, dendritic cells are part of the immune system, and tactile cells are for touch sensation, so they don't produce the pigment for UV protection.

Answer:

A) constrict, capillary