Thermoregulation (coordination and control) *

Question 1

How is temperature change detected by the body?

Answer 1

by the hypothalamus or temperature receptors in the skin

Question 2

What happens when the body is too hot?

Answer 2

vasodilation
sweating
hair lies flat

Question 3

What is vasodilation?

Answer 3

shunt vessel constricts causing more blood to flow through capillaries close to the surface of the skin
heat is released through the skin by radiation

Question 4

How does sweating reduce body temperature?

Answer 4

sweat gland secretes sweat onto the surface of the skin
water in the sweat absorbs the heat from the skin/body as it evaporates

Question 5

How does hair lying flat reduce body temperature?

Answer 5

there is no insulating layer of air over the skin

Question 6

What happens when the body is too cold?

Answer 6

vasoconstriction
shivering
hair stands up

Question 7

What is vasoconstriction?

Answer 7

shunt vessel relaxes meaning more blood flows through it and less blood flows close to the surface of the skin
heat is stopped from escaping through the skin

Question 8

How does shivering increase body temperature?

Answer 8

muscles contract repeatedly using energy from respiration which produces heat

Question 9

How does hair standing up increase body temperature?

Answer 9

creates an insulating layer of air above the skin