Contractions of the papillary muscles
A) close the atrioventricular valves.
B) close the semilunar valves.
C) eject blood from the ventricles.
D) prevent the atrioventricular valves from reversing into the atria.
E) eject blood from the atria into the ventricles.
Answer: D
You might also like to view...
Myxedema commonly occurs in:
a. middle-aged men. b. children. c. middle-aged women. d. older women.
Specialized muscle fibers associated with detection of muscle length are ________.
A. muscle spindles B. Golgi tendon organs C. Pacinian corpuscles D. Merkel disks E. Ruffini end organs
The squid served as an ideal model system to study neurophysiology because
A) Squids are invertebrates and invertebrates have a simpler nervous system than vertebrates. B) The large diameter of the squid's neurons enabled researchers to make recordings from inside of a nerve cell. C) Fast electrical communication is a unique feature of squids. D) Squids are active predators and therefore have many nerves that can be easily studied.
The second thoracic spinal nerve exits the spinal column through the
A. vertebral canal of vertebrae T1, T2, and T3. B. intervertebral foramen between vertebrae T1 and T2. C. sacral hiatus. D. intervertebral foramen between vertebrae T2 and T3.