A passageway connecting neighboring osteocytes in an osteon is a
A. lacuna.
B. lamella.
C. osteocanal.
D. canaliculus.
E. central canal.
D
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The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it ________
A) pumps blood against a greater resistance B) expands the thoracic cage C) sends blood through a smaller valve D) pumps a greater volume of blood
A harmful substance that the liver produces when metabolizing fatty acids is ________.
A) urea. B) ammonia. C) rancid fatty acids. D) ketone bodies. E) beta units.
How is the basal metabolic rate (BMR) different from the total metabolic rate (TMR)?
A) The BMR is calculated when one is asleep. B) The TMR includes the BMR. C) The BMR includes energy expenditures for muscular contractions. D) The BMR includes the TMR.
Which of the following is NOT an effect of aging on the immune system?
A. Response to vaccines increases B. Thymus gland degenerates C. B cells do not clone D. A reduced amount of T cells that do not respond to foreign antigens