Both acetylcholine and norepinephrine can affect
A. exercise tolerance.
B. synthesis of actin and myosin.
C. smooth muscle contraction.
D. skeletal muscle contraction.
Answer: C
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When plasma glucose concentration exceeds the renal plasma threshold,
A) the glomerular filtration rate increases. B) glucose is secreted into the peritubular capillary. C) the volume of urine decreases. D) glucose appears in the urine.
Vasodilation is a widening of the lumen due to smooth muscle contraction.
a. true b. false
Why is type O blood called the universal donor?
A. Because everyone with type O blood is Rh+, like most of the population, so this blood type is compatible with all others B. It is not well understood why type O blood can be transfused into people with all blood types. C. Because type O blood plasma does not contain anti-A or anti-B antibodies, so it can be transfused into recipients of any blood type D. Because everyone with type O blood is Rh-, and therefore, this blood type cannot initiate any transfusion reactions E. Because type O red blood cells contain neither antigen A nor antigen B, so they can be transfused into most recipients of any blood type, without being attacked by antibodies
Blood pressure is ________
A) generally measured in veins B) the pressure of the blood against the blood vessel walls C) a number that is the average of the systolic and diastolic pressures D) the pressure of the blood against the blood vessel walls, generally measured in veins, and a number that is the average of the systolic and diastolic pressures