Identify functions of calcium within the body.

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A. Clotting B. Hardens bone C. Nerve conduction and muscle contraction D. All of the above.

Correct Answer: D

Rationale: Calcium is essential for blood clotting, bone structure, and nerve/muscle function.

A moth sex attractant would be a _______.

A. hormone B. neurotransmitter C. pheromone D. steroid

Correct Answer: C

Rationale: Pheromones are chemical signals affecting behavior in other individuals of the same species.

The hypothalamus regulates ___________.

A. heart rate B. body temperature C. water balance D. all of the above

Correct Answer: D

Rationale: The hypothalamus controls heart rate, temperature, water balance, and glandular secretions.

An overproduction of GH in adults causes a condition called ______.

A. hyperthyroidism B. acromegaly C. a pituitary giant D.

Correct Answer: B

Rationale: Excess GH in adults leads to acromegaly, not gigantism (which occurs in childhood).

Calcium plays an important role in __________.

A. neural conduction B. muscle contraction C. blood clotting D. all of the above

Correct Answer: D

Rationale: Calcium is critical for nerve signaling, muscle contraction, and clotting.

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