7.3 pt2

Question 1

Thermoregulation

Answer 1

-Homeostasis processes like thermoregulation typically involve negative feedback loops
-The outcome of the loop will decrease the initial stimulus and return body back to its ideal condition

Question 2

How does the nervous system react when a rise in temp is recorded?

Answer 2

When a rise in temperature (>37oC) is detected, the hypothalamus will:
-Send a nerve impulse to trigger sweating
As sweat evaporates, it cools the body
-Send a nerve impulse to trigger blood vessels near the skin become wider. This is called vasodilation.
-more blood flowing to the skin increases heat loss to the environment – makes your face red!

Question 3

How does the nervous system react when a drop in temp is recorded

Answer 3

When a drop in temperature (<37oC) is detected, the hypothalamus will:
-Send a nerve impulse to trigger shivering in muscles around the vital organs
moving muscles increase internal body temperature
-Send a nerve impulse to trigger blood vessels near the skin become narrower. -This is called vasoconstriction.
less blood flowing to the skin reducing heat lost to the environment

Question 4

How does the Endocrine system affect the metabolic rate of cells

Answer 4

If the body is too warm,
 less thyroxine will be released
lower metabolic rate
body temp drops back to 37oC

If the body is too cold,
 more thyroxine will be released
increase metabolic rate
body temp increases to 37oC

Question 5

regulating Body Temperature

Answer 5

-Humans are endotherms (warm-blooded):
-We can generate our own heat through metabolic reactions
-We need a stable body temperature to function properly (~37oC)
-Maintaining a constant body temperature is known as thermoregulation.