Question

Choose the CORRECT statement.

• A. The number of parathyroid glands in humans is three.
• B. The pineal gland secretes thymosin.
• C. Cortisol is a protein hormone
• D. The thyroid gland is composed of follicles and stromal tissues.

Answer 1

Answer:

D. The thyroid gland is composed of follicles and stromal tissues.

• The thyroid gland consists of two lobes connected by an isthmus. Each lobe is made up of thyroid follicles (which produce $T_3$ and $T_4$) and stromal (connective) tissues. •Humans typically have four parathyroid glands (two pairs), located on the posterior surface of the lobes of the thyroid gland. • The Pineal gland secretes Melatonin (which regulates the sleep-wake cycle). Thymosin is actually secreted by the Thymus gland. • Cortisol is a Steroid hormone (derived from cholesterol), not a protein hormone. Protein hormones include things like Insulin or Growth Hormone.