The AV node stimulates the contraction of the ___________
Fill in the blank(s) with the appropriate word(s).
Answer: Ventricles
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A lack of vitamin C in the diet results in which of the following?
A. A mutation in the gene for elastin B. A mutation in the gene for collagen C. Abnormally loose collagen fibers, loose joints, and stretchy skin D. Decreased production of the amino acids proline and lysine leading to weak collagen E. Atrophy of skeletal muscle tissue
A quadriplegic with damage high in the cervical spinal cord may have a paralyzed diaphragm, such that the patient cannot ________ on his own
A) Breathe B) Swallow food C) Speak D) Close their eyes
Physicians are interested in cardiac output because it provides a useful indication of __________.
a. ventricular efficiency over time b. the amount of blood ejected by each ventricle c. valvular malfunctions d. atrial efficiency in respect to time
Which of the following may explain why self-tolerance may fail?
A. A noncirculating antigen becomes exposed to the immune system. B. Antibodies produced against foreign antigens cross-react with self-antigens. C. Antibodies directed against other antibodies are produced. D. All of the choices are correct.