Answer to Question 1
1, 4
Rationale 1:The hypothalamus and pituitary are the two endocrine structures that control other endocrine glands.
Rationale 2:The thyroid is one of the glands in the endocrine system.
Rationale 3:The pancreas is one of the glands in the endocrine system.
Rationale 4:The hypothalamus and pituitary are the two endocrine structures that control other endocrine glands.
Rationale 5:The adrenal is one of the glands in the endocrine system.
Global Rationale: Two endocrine structures in the brain deserve special recognition because they control many other endocrine glands. The hypothalamus secretes chemicals called releasing hormones that travel via blood vessels a short distance to an area immediately below, called the pituitary gland. These releasing factors tell the pituitary gland which hormone to release.
Answer to Question 2
2
Rationale 1:As serum calcium levels decrease, PTH is released, not decreased.
Rationale 2:This is the correct example of negative feedback.
Rationale 3:As serum calcium levels fall, PTH is released.
Rationale 4:As serum calcium levels fall, PTH is released.
Global Rationale: In the endocrine system, it is common for one hormone to control the secretion of another hormone. It is also common for the last hormone or action in the pathway to provide feedback. Most endocrine glands work by feedback inhibition in which the last hormone or action in the pathway prevents the production and release of the first hormone. As the serum calcium levels fall, PTH is released.
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