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MariaCamacho5008

Physiology weeks 7-13.

Which of the following is not used by the body as a neurotransmitter? Nitric oxide Acetylcholine Carbon monoxide All of the above are used by the body as neurotransmitters. All of the above are used by the body as neurotransmitters.
Within the nervous system, coding for the strength of a stimulus is accomplished through: changes in the length or duration of the action potential. the frequency of nerve impulses. an increase in the number of opening sodium channels. the frequency of nerve impulses.
Which is true of a neuron with a resting potential? The outer surface of the plasma membrane has a negative charge. The highest concentration of K+ is extracellular. The sodium pump has moved Na+ to the outside of the plasma membrane. The sodium pump has moved Na+ to the outside of the plasma membrane.
Which of the following is not an example of sympathetic stimulation? Constriction of the bronchioles Decreased secretion of the pancreas Constriction of the urinary sphincters Dilation of skeletal muscle blood vessels Constriction of the bronchioles
Sensory impulses ending in what part of the CNS trigger imprecise or “crude” sensation awareness? Thalamus Cerebellum Brainstem Cerebral cortex Thalamus
The chemoreceptors in the carotid bodies are particularly sensitive to: hypercapnia. hypoxia. a decrease in blood pH. an increase in the hydrogen ion concentration of the blood. hypercapnia.
A decrease in the amount of white blood cells is called leukocytosis. leukopenia. differential white blood cell count. hemostasis. leukopenia.
Which of the following vessels do not have the ability to constrict and dilate? capillaries Arterioles arteries veins capillaries
Inhibition of sympathetic vasoconstrictor impulses is considered a major mechanism of vasoconstriction. vasodilation. vasopressure. vasomotor control. vasodilation.
After blood leaves the lungs and returns to the heart, it enters the right atrium. left atrium. right ventricle. left ventricle. left ventricle. left atrium.
During pregnancy, what happens to the oxygenated blood returned from the placenta via the umbilical vein? It flows into the inferior vena cava. It flows into the superior vena cava. It flows into the ductus venosus. It flows into the inferior vena cava.
Inhibition of sympathetic vasoconstrictor impulses is considered a major mechanism of vasoconstriction. vasodilation. vasopressure. vasomotor control. vasodilation.
Ciliated cells lining the respiratory tract: help move air into and out of the lungs. trap and phagocytize microorganisms. help move the mucus blanket toward the pharynx. do both B and C. help move the mucus blanket toward the pharynx.
During inspiration, the expansion of the lungs causes: cohesion of visceral and parietal pleura. a pressure gradient from alveoli to atmosphere. a decrease in alveolar pressure. a decrease in alveolar pressure.
External respiration can be defined as: the exchange of gases between the lung and the blood capillaries in the lung. pulmonary ventilation. the exchange of gases between the blood capillaries and the tissue cells. both A and B. both A and B.
Created by: MariaC5008
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