What structure regulates what enters the colon from the ileum?
A) ileocecal valve
B) internal anal sphincter
C) external anal sphincter
D) pyloric sphincter
A
Explanation:
B) The internal anal sphincter does not regulate what enters the colon.
C) The external anal sphincter does not regulate what enters the colon.
D) The pyloric sphincter does not regulate what enters the colon.
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Once inside the sympathetic trunk, the sympathetic preganglionic axons may/will
A. follow any of the routes listed. B. travel inferiorly. C. remain at the level of entry. D. travel superiorly.
The P wave of an ECG corresponds to
A) the depolarization of the atria. B) the progressive wave of ventricular depolarization. C) atrial repolarization. D) the repolarization of the ventricles. E) None of the answers are correct.
The most nutrient absorption takes place in the
A) duodenum and jejunum. B) stomach and duodenum. C) jejunum and ileum. D) esophagus and stomach. E) ileum and cecum.
The rapid increase in ventilation and heart rate that occurs at the onset of exercise:
A. is not altered by training. B. is an anticipatory neural response. C. is driven by arterial blood gas changes. D. reflects an adjustment period where oxygen delivery and consumption are matched. E. is due to the exceeding of the anaerobic threshold.