Which of the following statements is correct in relation to the e…

MCQ

Which of the following statements is correct in relation to the endocrine system?

✓
Nonnutrient chemicals produced by the body in trace amounts that act as intercellular messenger are known as hormones.
B
Releasing and inhibitory hormones are produced by the pituitary gland.
C
Adenohypophysis is under direct neural regulation of the hypothalamus.
D
Organs in the body like gastrointestinal tract, heart, kidney and liver do not produce any hormones.

✓

Answer

Correct option: A.

Nonnutrient chemicals produced by the body in trace amounts that act as intercellular messenger are known as hormones.

a
(a) : Releasing and inhibiting factors are released by hypothalamus. The hypothalamus is connected to adenohypophysis by hypophysial portal vein and is connected to the neurohypophysis by axons of neurosecretory cells. Hence, neurohypophysis is directly under the neural control. The cardiocytes of atria of the heart secrete peptide hormone, called atrial natriuretic factor $(ANF)$ in response to an increased return of the deoxygenated (venous) blood. The liver produces angiotensinogen which is changed to angiotensin $II$ by an enzyme renin secreted by juxtaglomerular apparatus $(JGA)$.