__________ filaments are structures within the sarcomere that consist mostly of actin.
Fill in the blank(s) with the appropriate word(s).
Thin
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Which hormone promotes the final step of spermatogenesis?
a) Relaxin b) Testosterone c) Inhibin d) Estrogen e) Aldosterone
During exhalation of the first breath, the lungs do not collapse completely again in a newborn infant because
A) the incoming air is warmed by the upper portion of the respiratory tract, and this causes the lung tissues to expand and remain larger in size than previously, even when emptied of air. B) surfactant covering the alveolar surfaces prevents their collapse. C) exhalation is never as forceful as is inhalation. D) cartilages and connective tissues keep the conducting passageways closed. E) None of the answers are correct.
What is the purpose of the signal delay at the AV node during excitation of the heart?
A. Allows for greater excitation of the ventricles B. Spreads the action potential across a greater surface area C. Allow for total ventricular filling D. Increases the end-systolic volume
Which of the following would decrease the velocity of blood flow?
A. Increased afterload B. Decreased vasomotion C. Increased viscosity D. Increased blood pressure E. Increased vessel radius