Ch 5, 3 Functions of the integumentary system

Question 1

chemical protection

Answer 1

skin has a low pH and produces protective chemicals

Question 2

physical/mechanical barriers

Answer 2

keratin and glycolipids block water and most water soluble substances
some penetration by lipid-soluble substances, organic solvents, salts of heavy metals, some drugs

Question 3

biological barriers

Answer 3

dendritic cells in epidermis. macrophages in dermis, and DNA itself (acts as a sunscreen)

Question 4

body temperature regulation

Answer 4

at elevated temp

• dilation of dermal vessels
• increased sweat gland activity

Question 5

cutaneous sensations

Answer 5

temp, touch, pain

Question 6

metabolic functions

Answer 6

synthesis of vitamin D precursor and collagenase

chemical conversion of carcinogens and some hormones

Question 7

blood reservoir

Answer 7

up to 5% of bodys blood volume

Question 8

excretion

Answer 8

salt and tiny amounts of nitrogenous wastes in sweat