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1. Homeostasis.
1. Identify the feedback mechanism that maintains your body temperature
when your surroundings are very hot.
a. The brain sends a message to the skin. The muscles in the skin
contract, or shiver, to cool the body.
b. The muscles in the skin contract, which sends a message to the
brain that you feel hot. The brain sends a message to the skin’s heat
receptors.
c. Heat receptors in the skin send a message to the brain. The brain
sends a response to start sweating, which cools the body.
d. The skin starts sweating. The sweat sends a message to the brain,
which sends a response to stop sweating.
2. If you apply an ice pack to an injury ankle, will your body temperature
decrease? Why or why not?
3. Negative feedback is a control system that helps the body maintain
homeostasis by sending a signal to ____________ a response.
4. ____________ feedback is the type of control system in effect when you
feel hungry and eat.
5. Positive feedback is a control system that sends a signal to ________ a
response.
6. Childbirth is another example of ____________ feedback.
7. What type of feedback loop is shown?
a. Positive
b. Negative
c. Neutral

2. 8. If the environment gets cold, we will often shiver in order to:
a. keep body temperature the same as the external temperature
b. decrease body temperature
c. increase body temperature
d. regulate blood pressure
9. When you get cut, your skin cells release hormones that signal platelets to
come and stop the bleeding. Platelets then release more hormones that
signal even more platelets to help stop bleeding. The hormone signals
continue until the cut is closed. This is an example of what type of
feedback?
a. Positive Feedback Mechanism
b. Negative Feedback Mechanism
10.This statement about Homeostasis is incorrect
a. because of this, the fluctuations of the internal environment are of
extremely narrow range as compared to that of the external environment
b. there is a definite control system regulating the homeostatic activities
c. homeostatic mechanisms keep the internal environment fixed despite
wide changes in the external environment
d. all the above
11. Construct a table like the one below to show the changes that take place
when a person is put in a hot or cold environment. Your table should have
Three columns.
12.