Endocrine System Quizzes

B: The anterior pituitary produces and releases six hormones.

B: Parafollicular (or “C”) cells of the thyroid produce calcitonin which aids in lowering of blood calcium.

D: The pituitary gland releases peptide hormones which are soluble in blood. The other choices refer to steroid hormones which are insoluble in blood. They require transport via plasma proteins.

D: Aldosterone promotes the absorption of sodium from the filtrate, while potassium (also a positively charged ion) is secreted to maintain electrical neutrality.

D: Hypothalamus secretes regulatory hormones that control endocrine cells in the anterior pituitary gland, produces ADH and oxytocin and contains “autonomic centres” that exert neural control over endocrine cells of the adrenal medullae.

B: ADH and OT are produced in the hypothalamus and transported to the posterior pituitary.

C: The hypothalamus controls the secretion of the anterior pituitary by the use of “releasing hormones” and “inhibitory hormones”.

C: Steroids are lipid soluble so diffuse through the plasma membrane to bind to a receptor within the cell.

C: PTH causes increased calcium absorption and hence increases blood calcium level.

D: As steroid hormones are lipid soluble, their receptors are inside the cell as they can cross the plasma membrane.

A: Thyroid hormones T3 and T4 contain three and four iodine atoms, respectively.

C: The acini cells produce digestive enzymes.

A: Catecholamines (adrenaline, noradrenaline), dopamine and thyroid hormone are all derived from tyrosine.

A: PTH increases plasma Ca2+ (calcitonin aids in lowering blood calcium).

B: Testosterone is not produced in the pituitary nor does the pituitary contain autonomic centres.