Question

1. How does non shivering thermogenesis contribute to thermoregulation?

Select one:

a. It increases heat production by increasing metabolic activity.

b. It increases heat production by speeding up the rate of blood flow throughout the body.

c. It vasoconstricts peripheral blood vessels and directs blood flow to the core of the body.

d. It increases sweat production in hot environments.

2. Depending on the environment, heat can be lost or gained through various channels. Which of the following statements are true about heat transfer during exercise? Select all that apply.

Select one or more:

a. Wind increases heat loss via convection

b. Heat produced by active muscles is picked up by circulating blood and transported to other parts of the body.

c. On hot days, heat can be radiated from the ground to the body.

d. Convection occurs when sun rays heat the body on hot days.

e. The potential risk for heat stress can be measured by air temperature alone

3. Mary is exercising outside on a hot humid day and is sweating a lot. What statement is likely true about Mary's condition?

Select one:

a. Mary's risk for heat stress is reduced due to the humid air and a high sweat rate.

b. Mary's ability to thermoregulate is limited because sweat is less able to evaporate in humid environments.

c. Mary is likely experiencing non-shivering thermogenesis due to the temperature.

d. Mary is likely experiencing an increased blood plasma volume due to dehydration.

Answer 1

1	a. It increases heat production by increasing metabolic activity.	It is due to metabolism associated at the brown adipose tissue and is controlled by the activity of sympathetic nerve supply
2	a. Wind increases heat loss via convection	There is an increase in the loss of heat due to convection. This can happen by the air of fan also.
b. Heat produced by active muscles is picked up by circulating blood and transported to other parts of the body.	The heat radiated from muscles and respiring cells is taken up by the blood vessels and this heat is transferred around the body.
3	b. Mary's ability to thermoregulate is limited because sweat is less able to evaporate in humid environments.	Performing exercise in the hot weather adds the stress over the body. The process of exercising along with the temperature of air and humidity can have serious impact. In humid environment, the stress is unable to evaporate and body temperature may raise.