Triggering of the muscle action potential occurs after
A) acetylcholine binds to chemically-gated channels in the motor end plate.
B) acetylcholinesterase is released from synaptic vesicles into the synaptic cleft.
C) calcium ion binds to channels on the motor end plate.
D) the action potential jumps across the neuromuscular junction.
E) Any of these can produce an action potential in the muscle cell.
A
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In the diagram, which labeled structure contains motor proteins that convert the energy in ATP into mechanical movements?
a) C b) A c) E d) D e) None of these are correct.
Which of the following statements is false?
a. Each taste bud is most sensitive to one of the five basic tastes. b. Sensitivity of taste buds for sweet taste is very high. c. Adaptation for taste is rapid. d. Olfaction influences taste. e. Sensitivities for sweet and salty tastes are the lowest.
Which of the following is not a rotator cuff muscle?
A. teres major B. infraspinatus C. supraspinatus D. subscapularis E. all of the above are rotator cuff muscles
Answer the following statements true (T) or false (F)
1. The average individual has 500 ml of residual volume in his lungs 2. Atelectasis (lung collapse) renders the lung useless for ventilation. 3. The Hering-Breuer reflex is a potentially dangerous response that may cause overinflation of the lung. 4. Strong emotions and pain acting through the limbic system activate sympathetic centers in the hypothalamus, thus modulating respiratory rate and depth by sending signals to the respiratory centers. 5. As carbon dioxide enters systemic blood, it causes more oxygen to dissociate from hemoglobin (the Haldane effect), which in turn allows more CO2 to combine with hemoglobin and more bicarbonate ion to be generated (the Bohr effect).