Which of the choices below is the major muscle for breathing?
A) diaphragm
B) rectus abdominis
C) latissimus dorsi
D) temporalis
A) diaphragm
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Arrival of an action potential at the synaptic knob results in
A. opening of voltage-gated calcium channels and diffusion of calcium into the synaptic knob. B. opening of voltage-gated calcium channels and diffusion of calcium out of the synaptic knob to the interstitial fluid. C. closure of voltage-gated calcium channels in the synaptic knob membrane. D. opening of chemically gated calcium channels and diffusion of calcium into the synaptic knob. E. opening of chemically gated calcium channels and diffusion of calcium out of the synaptic knob to the interstitial fluid.
Define the terms end diastolic volume (EDV) and end systolic volume (ESV) and relate them to the calculation of stroke volume
What will be an ideal response?
What is the path of blood flow from the heart to the lung tissues and back to the heart?
A. Left ventricle ? aorta ? bronchial arteries ? lung tissues ? bronchial veins ? azygos vein ? superior vena cava ? right atrium B. Left ventricle ? aorta ? brachiocephalic artery ? lung tissues ? bronchial veins ? brachiocephalic vein ? superior vena cava ? right atrium C. Right ventricle ? pulmonary trunk ? pulmonary arteries ? lung tissues ? pulmonary veins ? left atrium D. Right ventricle ? brachiocephalic arteries ? lung tissues ? brachiocephalic veins ? inferior vena cava ? left atrium
Central chemoreceptors detect a decrease in pH in interstitial fluids in the brain. What is the response of the medulla to maintain delivery of oxygen to cells?
A) A feedback loop is initiated that indirectly increases parasympathetic activity which results in vasodilation and a decrease in blood pressure. B) A feedback loop is initiated that indirectly decreases sympathetic activity which results in vasodilation and a decrease in blood pressure. C) A feedback loop is initiated that indirectly increases parasympathetic activity which results in vasoconstriction and a rise in blood pressure. D) A feedback loop is initiated that indirectly increases sympathetic activity which results in vasoconstriction and a rise in blood pressure.