Question

1)What area of the body is known as the "thermostat of the body"?

Select one:

a. Eccrine sweat glands

b. The preoptic-anterior hypothalamus

c. The peripheral nervous system

d. Skin arterioles

2)How does dehydration affect blood volume?

Select one:

a. Dehydration decreases blood volume by increasing sweat production

b. Dehydration decreases blood volume by decreasing plasma volume

c. Dehydration increases blood volume by limiting the amount a person sweats

d. Dehydration increases blood volume initially and then reduces it if a person starts exercising

3. What steps should be taken to avoid the risk of hyperthermia during exercise or sporting events?

a. Participants should bundle up so they do not get cold.

b. Participants should monitor their body temperature and cease exercise if it exceeds 98.5 degrees Fahrenheit.

c. Events should avoid the hottest time of the day and provide drinks for participants.

d. Participants should train in hot environments so they don't need to cancel events in hot weather.

Answer 1

1. ANSWER: Preoptic anterior hyppthalamus.

Reason: Preoptic anterior hyppthalamus is a part of hypothalamus which sense the core temperature of the body and regulates it to about 98.6'F.

2. ANSWER: Dehydration decreasesblood volume by decreasing the plasma volume.

Reason: Dehydration decreases the plama volume and there is a relative decrease in the blood volume.

3. ANSWER: Events should avoid the hottesttime of the day and provide drikms for the participants.

Reason: During the hottest time of the day the body becomes more fatigue and the participants who are involved in sporting events may undergo dehydration.