Question

Which hormone among these is not secreted by an endocrine gland?
A. ADH
B. ANF
C. T4
D. PTH

Answer 1

A gland is an organ that produces and releases substances that help the body perform specific tasks. There are two different kinds of glands. Endocrine glands are ductless glands that produce hormones and release them directly into the bloodstream.

Complete answer:
Hormones are chemicals that influence a variety of bodily functions, including hunger, reproduction, and growth, as well as more complex functions such as human emotions and behavior. The endocrine system is made up of nine primary glands that produce hormones in our bodies, as well as other organs that provide auxiliary functions.
Endocrine glands, unlike exocrine glands (sweat, saliva), secrete their substances directly into the bloodstream rather than through a duct. These endocrine glands are part of the body's control system, and they produce hormones that aid in the regulation of cell and tissue functions. Some glands are only found in males (testes) or females (ovaries).
Option A: ADH: The hypothalamus in the brain produces ADH, which is then stored in the posterior pituitary gland at the base of the brain.
Option B: ANF: Atrial natriuretic factor (ANF) is a hormone produced by the heart's atrial walls. It is the cause of a drop in blood pressure. When blood pressure rises, ANF secreted dilates the blood vessels, resulting in a drop in blood pressure. The hypothalamus, pituitary gland, pineal gland, thyroid, parathyroid, thymus, and pineal gland are endocrine glands in animals.
Option C: T4: The thyroid gland produces thyroxine (T4), which is regulated by the hypothalamus and pituitary gland. The feedback loop stimulates the pituitary gland to release thyroid-stimulating hormone by signaling the hypothalamus to release the thyrotropin-releasing hormone.
Option D: PTH: The most important regulator of blood calcium levels is the parathyroid hormone, which is secreted by the parathyroid glands.

Hence, Option B: ANF is the correct answer.

Note:
In between two halves of the brain, the pineal gland is located. Because of its location in the brain and connection to light, it has been referred to as the "third eye" for most of history. Melatonin is a hormone that regulates the body's internal clock. It affects the body's sleep/wake cycle and is also called the Circadian Rhythm.