Chemical Coordination and Integration Test - 6

People who need to adjust to an earlier bedtime are advised to wear blue-blocking goggles to block the blue light as blue light suppresses melatonin. Melatonin is a sleep inducing hormone and if it is suppressed, sleep cycle can be disturbed. Thus, both A and R are true and R is the correct explanation of A.

Thymic humoral factor (THF) increases the immune responses particularly to viruses.

This sentence is false. Steroid hormones are lipids in their chemical nature.

ANP has exactly the opposite function of the aldosterone which is secreted by the zona glomerulosa in regard to its effect on sodium in the kidney. Aldosterone stimulates sodium retention and ANP reduces the sodium load to reduce the blood pressure.

The thyronamines inhibit the neuronal activity which plays an important role in the hibernation cycles of mammals and the moulting behaviour of birds.

Epinephrine causes vasodilation of the arterioles of the skeletal muscles and vasoconstriction of the arterioles of the skin, mucus membrane and splanchnic viscera.

Prolactin is a protein hormone generated by mammotrophs of anterior pituitary. Prolactin is known for its role in enabling mammals, usually females, to produce milk.

Renin is stimulated when there is a decrease in blood pressure or sodium level. Renin stimulates the proximal tubules in the kidney to reabsorb sodium ions, and constricts the walls of arterioles closing down capillary beds; thus, increasing the blood pressure.

Dopamine is produced by Dopamine neurons of the arcuate nucleus, and functions in inhibition of prolactin release.

This sentence is false. Secretin decreases water and electrolyte secretion in stomach.