What largely determines preload?
A) end-systolic volume (ESV) B) end-diastolic volume (EDV)
C) afterload D) stroke volume
Answer: B
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When blood passes through systemic capillaries, the oxygen saturation of hemoglobin changes
A. from about 98% to about 75% saturated. B. from about 40% to about 80% saturated. C. from about 70% saturated to about 99% saturated. D. from about 99% saturated to about 25% saturated.
A nurse pricks your finger to type your blood. You flinch at the pain, pulling your hand back. This is called the ________ reflex.
A. flexor (withdrawal) B. tendon C. convergence D. crossed extension E. stretch
Contrast appositional and interstitial growth of cartilage
A) Appositional growth adds more fibers, and interstitial growth adds more interstitial fluid around the fibers. B) Appositional growth adds more fibers, and interstitial growth adds more ground substance around the fibers. C) Appositional growth adds new layers to the outside, and interstitial growth enlarges the cartilage from within. D) Appositional growth enlarges the cartilage from within, and interstitial growth adds new layer to the outside. E) Apposition growth enlarges cartilage length-wise, and interstitial growth enlarges cartilage width-wise.
When calcium ion binds to troponin,
A) tropomyosin moves into the groove between the helical actin strands. B) active sites on the myosin are exposed. C) troponin shifts to expose the active sites on actin. D) muscle relaxation occurs. E) myosin shortens.