Chapter 6 (page 34)

Question 1

____________ - When the body sweats, water accumulates on the skin, this water is then evaporated away.

Answer 1

Evaporation

Question 2

What is Convection?

Answer 2

This is the transfer of heat to or from the body as air or fluid passes over the body, i.e. wind-chill.

Question 3

What are the heat promoting mechanisms?

Answer 3

Vasoconstriction of cutaneous blood vessels
Increased metabolic rate
Shivering

Question 4

What fibres cause blood vessels in skin to vasoconstrict?

Answer 4

SNS fibres

Question 5

What stimulates the release of norepinephrine, which elevates
metabolic rate, which enhances heat production.

Answer 5

Cold

Question 6

_______________________ - SNS fibres cause blood vessels in skin to
vasoconstrict. Blood is restricted to deep areas so less heat is lost through radiation, evaporation, etc.

Answer 6

Vasoconstriction of cutaneous blood vessels

Question 7

__________ - Brain centers controlling muscle tone become more active causing
involuntary shuddering contractions of skeletal muscles.

Answer 7

Shivering

Question 8

_______________ - Cold stimulates release of norepinephrine, which elevates metabolic rate, which enhances heat production.

Answer 8

Increased metabolic rate