42: Thermoregulation

Question 1

When does the body’s peak temp occur?

Answer 1

Peak: evening

Question 2

What is unique about neuron somas in brain thermoreceptors area?

Answer 2

Somas are sensitive to temp

Question 3

When are set points some of the lowest and highest?

Answer 3

Lowest: during sleep
Highest: exercise (up to 40 degrees)

Question 4

Low vs high flow rate of sweat

Answer 4

Low flow rate: concentrated sweat

High flow rate: loss of water bc no time to reabsorb

Question 5

Acclimation to high flow rate of sweat

Answer 5

Aldosterone acts -> less Na comes through sweat

Question 6

Fever vs hyperthermia

Answer 6

Fever: controlled increase in body temp
Hyperthermia: uncontrolled increase in body temp

Question 7

What happens to set point in fever vs hyperthermia

Answer 7

Fever: set point increases, so body temp follows
Hyperthermia: set point does not change, but core temp does

Question 8

S/S in fever vs hyperthermia

Answer 8

Fever: pallor, shivering, feeling cold
Hyperthermia: flushed, sweating, behavioral changes associated with being hot

Question 9

Major reason for fevers that increases set point

Answer 9

Prostaglandin E2

Question 10

What forms prostaglandin E2?

Answer 10

Immune cells

Question 11

What happens when a fever breaks?

Answer 11

Less prostaglandins -> hypothalamic set point returns -> body temp is higher than set point, so you feel hot as youre losing heat