Worn-out red blood cells are removed from circulation by the ________ and ________.
A. kidneys; thymus gland
B. spleen; kidneys
C. liver; kidneys
D. liver; spleen
Answer: D
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Sound signals are carried from the ear to the brain by the optic nerve.
Answer the following statement true (T) or false (F)
Which hormone does not play a role in regulating fluid and electrolyte balance?
A) ADH B) aldosterone C) cortisol D) atrial natriuretic peptide E) B-type natriuretic peptide
The first recognizable feature of the cardiovascular system is (the)
A) heartbeat at birth. B) formation of blood cells in the liver. C) heartbeat at five months. D) development of the aorta at two months. E) None of the answers are correct
Which is NOT true regarding antibodies?
A. They are secreted by plasma cells. B. They protect against viruses by binding to them and presenting them to phagocytes. C. They protect against viruses by binding to them and neutralizing them. D. They activate complement. E. They are the main mediators of the innate immune response.