Which structures pull on the tendinous cords (chordae tendinae) and hold them taut during ventricular contraction?
A. Papillary muscles
B. Pectinate muscles
C. Trabeculae carneae
D. Coronary ropes
E. Fibers in the atrioventricular bundle
Answer: A
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The following angle is given in degrees, arcminutes, and arcseconds. Rewrite them in degrees and fractions of degrees: 60 38' 42"
At a synapse the 0.2-0.5 milliseconds it takes for calcium influx and neurotransmitter release is called
A) latency period. B) synaptic delay. C) recovery period. D) repolarization. E) synaptic diffusion.
The smooth muscle of the digestive viscera is served largely by the ________
A) pelvic nerves B) vagus (X) nerves C) lumbar splanchnic nerves D) cephalic plexus
The defecation reflex
A. constricts the internal anal sphincter. B. is stimulated by distention of the rectum. C. lasts several hours. D. inhibits further peristalsis in the rectum and lower colon. E. None of the choices are correct.