Page 45 - Science Course 2 (Book 1)
P. 45
5. jaw muscles
6. circulatory system
7. villi
8. blood vessels
9. muscular system that
surrounds the blood vessels
Mo2-L2: Key Concept Check
Direction: On the line before each statement, write P if the statement describes positive feedback or N if
the statement describes negative feedback.
1. You are hungry.
2. Platelets move to the site of a wound.
3. The endocrine system signals the muscular system to contract during childbirth.
4. You have been working for two hours and begin to feel tired.
5. You feel full after finishing a large meal and are asked if you would like another helping of
mashed potatoes.
6. You would like to go swimming, but the water feels cold.
7. White blood cells rush to the site of an infection.
8. You feel a severe cramp in your leg while playing basketball.
Direction: Answer each question on the lines provided.
9. In what way do feedback systems help maintain homeostasis?
10. What is the difference between positive feedback and negative feedback?
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