What is the primary hormone secreted by the thyroid?

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Question 1 of 5

What is the primary hormone secreted by the thyroid?

Correct Answer: D

Rationale: The thyroid secretes T3 (triiodothyronine) and T4 (thyroxine) (D) as its primary hormones. Oxytocin (A) is from the pituitary, TSH (B) stimulates the thyroid, and adrenaline (C) is from the adrenal glands.

Question 2 of 5

The hypothalamus is part of the

Correct Answer: B

Rationale: The hypothalamus is part of the endocrine system (B), regulating hormones. It’s not primarily cardiovascular (A), respiratory (C), or lymphatic (D).

Question 3 of 5

What is the function of parathyroid hormone?

Correct Answer: D

Rationale: Parathyroid hormone activates vitamin D (D) to regulate calcium. Energy (A) and metabolism (C) are thyroid-related, and cell reproduction (B) is not its role.

Question 4 of 5

Which is not an example of nonspecific immune response?

Correct Answer: D

Rationale: Antibody production (D) is specific immunity. Inflammation (A), vasodilation (B), and histamine release (C) are nonspecific.

Question 5 of 5

Unlike the cone cells in the eye, the rod cells are responsible for

Correct Answer: C

Rationale: Rod cells handle night vision (C), unlike cones (color, A). Depth perception (B) involves both, and eye color (D) is iris pigment.

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