The spinal nerves of the PNS are formed by the combination of ________
A) white matter and gray matter
B) a ventral root and a dorsal root
C) an anterior horn and a posterior horn
D) a dorsal root ganglion and a ventral root
B
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If blood flow through the afferent arterioles increases,
A) stretch reflexes trigger vasoconstriction to reduce the flow. B) the smooth muscle in the vessel walls stretches to accommodate the increased flow and the stretch triggers further relaxation of the arteriolar wall, lessening blood pressure. C) the smooth muscle in the vessel walls stretches to accommodate the increased flow. D) the stretch triggers further relaxation of the arteriolar wall, lessening blood pressure.
When fatty acids are metabolized for cellular respiration, the first step involves breaking two carbons off the chain at a time to form acetyl CoA molecules. Acetyl CoA then
A. is converted to pyruvate and lactate. B. begins the electron transport chain. C. undergoes glycolysis. D. enters the citric acid cycle.
A certain drug decreases heart rate by blocking a receptor on cardiac pacemaker cells. This drug probably binds to ________ receptors
A) nicotinic cholinergic B) muscarinic cholinergic C) alpha-1 adrenergic D) alpha-2 adrenergic E) beta-1 adrenergic
Pulse oximetry is used to measure the:
A) percentage of hemoglobin that is saturated with oxygen. B) exchange of oxygen and carbon dioxide at the cellular level. C) percentage of carbon dioxide that is eliminated from the body. D) amount of oxygen dissolved in the plasma portion of the blood.