In people who stand for long periods, blood tends to pool in the lower limbs and this may result in varicose veins. What causes the varicose veins?
A. A ruptured aneurysm in a vein
B. An aneurysm or weak point in a vein
C. Failure of the lymphatic valves
D. An aneurysm or weak point in an artery
E. Failure of the venous valves
Answer: E
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Membrane-bound proteins that use metabolic energy to move ions across the plasma membrane are called ________ pumps
A) channel B) receptor C) active D) motor E) ion
Activation energy is
A) required to convert an endergonic reaction to an exergonic reaction. B) the energy required for an endergonic reaction. C) the energy lost or gained in a reaction. D) the energy required to bring molecules into a position where they can interact.
The renal function is approximately what percent of the cardiac output?
a) 21 b) 1 c) 5 d) 83
The type of connective tissue fiber that stretches is reticular fibers.
Answer the following statement true (T) or false (F)