Anatomy & Physiology Endocrine #4

Question

Which hormone is secreted by the pineal gland?

Answers

  1. Prolactin
    • Rationale:

      Prolactin is stored and secreted by the anterior pituitary gland, not the pineal gland.

  2. Oxytocin
    • Rationale:

      Oxytocin is a hormone that is secreted and/or stored by both the hypothalamus and the posterior pituitary gland, not the pineal gland.

  3. Thyroxine
    • Rationale:

      Thyroxine is stored and secreted by the thyroid gland, not the pineal gland.

  4. Melatonin
    • Rationale:

      Melatonin is stored and secreted by the pineal gland. It plays a role in maintaining circadian rhythm.

Overview

The pineal gland is a pea-shaped, small gland located in the brain. Its function is not entirely understood.

Explanation

Learning Outcomes

Evidence suggests that the pineal gland both produces and regulates some hormones, including melatonin. Melatonin’s role is in regulating an individual’s sleep patterns. Sleep patterns are also referred to as circadian rhythms.

Test Taking Tip

Consider the function of the pineal gland when answering this question.

Video Rationale