Excess glucose in animals is stored as ________.
A. cellulose
B. glycogen
C. galactose
D. starch
E. sucrose
Answer: B
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A long bone is covered externally with a sheath called the __________, whereas the marrow cavity is lined with the __________.
A. epiphysis; diaphysis B. diaphysis; epiphysis C. compact bone; spongy bone D. periosteum; endosteum E. endosteum; periosteum
What causes the opening and closing of the heart valves?
A. The action of the papillary muscles and chordae tendineae B. A pressure difference on the two sides of the valve C. Turbulent flow in the atria and ventricles D. Na+ and K+ fluxes during ventricular depolarization E. Stimulation by the sympathetic and parasympathetic nerves
The most abundant cell type in bone is
A) osteoclasts. B) osteoblasts. C) osteolytes. D) osteoprogenitor cells. E) osteocytes.
The lymphatic system differs from the cardiovascular system in that
A. the lymphatic vessels have their own "pump" to assist flow. B. the lymphatic system only carries fluid away from tissues. C. lymph circulates fluids and cardiovascular does not. D. lymph capillaries allow free movement of fluid in and out of the capillaries. E. lymph capillaries do not contain any fluid.