Critical Thinking

22. Making Comparisons Why might damage to the pituitary gland be considered far more serious than damage to one of the other endocrine glands?

23. Inferring Relationships Describe the importance of "fit" between a receptor protein and a hormone.

24. Analyzing Graphics Identify and describe the type of feedback mechanism operating in the diagram shown below.

w y11

Standardized Test Preparation

DIRECTIONS: Choose the letter of the answer choice that best answers the question.

1. What are the chemical messengers of the endocrine system called?

A. neurons

B. hormones

C. blood cells

D. carbohydrates

2. X and Y are hormones. X stimulates the secretion of Y, which exerts negative feedback on the cells that secrete X. Suppose the level of Y decreases. What should happen immediately afterwards?

F. Less X is secreted.

G. More X is secreted.

H. Secretion of Y stops. J. Secretion of X stops.

3. Endocrine glands

A. function only after puberty.

B. function only before puberty.

C. release products through ducts.

D. release products into the bloodstream.

INTERPRETING GRAPHICS: Study the figure below to answer the following questions.

Blood-Glucose Level

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Good Carb Diet

Good Carb Diet

WHAT IT IS A three-phase plan that has been likened to the low-carbohydrate Atkins program because during the first two weeks, South Beach eliminates most carbs, including bread, pasta, potatoes, fruit and most dairy products. In PHASE 2, healthy carbs, including most fruits, whole grains and dairy products are gradually reintroduced, but processed carbs such as bagels, cookies, cornflakes, regular pasta and rice cakes remain on the list of foods to avoid or eat rarely.

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