Question
Question: The pituitary gland does not control the secretory activity of (A)Thyroid (B)Adrenal cortex (C...
The pituitary gland does not control the secretory activity of
(A)Thyroid
(B)Adrenal cortex
(C)Adrenal medulla
(D)Testes
Solution
The Pituitary gland is a pea-shaped gland found in the middle of the skull base and plays an important role in the regulation of other hormones and major physiological functions.
Complete answer:
From the above options, the secretion activity of the adrenal medulla is not under the control of the pituitary gland.
The adrenal medulla secretes epinephrine, norepinephrine, and a small amount of dopamine as a response to the stimulation of the sympathetic nervous system. It is the main site for the conversion of the amino acid tyrosine and catecholamines.
Additional Information:
All other organs mentioned in the question secrete their specified secretions in control of the pituitary gland.
The thyroid is an endocrine gland that secretes three types of hormones namely triiodothyronine, thyroxine, and calcitonin. Secretion of the two thyroid hormones is regulated by TSH secreted by the anterior pituitary.
The adrenal cortex produces mineralocorticoids and glucocorticoids and is the secondary site of androgen synthesis. The secretory activity of this organ is controlled by the hormone ACTH from the anterior pituitary.
The cells that lie between the seminiferous tubules in the testes secrete testosterone hormone which is also in control of pituitary secretions. The testes also produce androgen which is a female hormone but males need it to produce testosterone.
So, the correct answer is "Adrenal Medulla".
Note: The hormones released by the pituitary gland plays important role in the regulation of physiological functions, therefore they are listed below-
Hormones | Function |
---|---|
Thyroid-stimulating hormone (FSH) | Stimulate the production and secretion of thyroid hormones |
Adrenocorticotropic hormone (ACTH) | Stimulates adrenal gland to release stress hormones |
Follicle-stimulating hormone (FSH) and Luteinizing hormone (LH) (Gonadotrophins) | Stimulate ovary to release estrogen and progesterone and the testes to release testosterone |
Growth hormone (GH) | Stimulate growth in children and participates in maintaining various body organs in adults |
Prolactin | Stimulate mammary gland to produce milk after childbirth |
Antidiuretic Hormone (ADH) | Controls water retention by the kidney and regulates fluid balance and mineral concentration in the body |
Oxytocin | Stimulate uterine contraction essential during delivery of a baby |