Aortic stenosis results from
A. a narrowed opening through the aortic valve.
B. leakage from the AV valves.
C. low oxygen levels.
D. a hole in the interatrial septum.
E. a weakening of heart muscle.
Answer: A
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What will be an ideal response?
The ion that triggers the release of acetylcholine into the synaptic cleft is
A) sodium. B) potassium. C) calcium. D) chloride. E) magnesium.
Which of the following statements is NOT true with regard to bones of the skull?
a) Some skull bones are covered with a mucous membrane. b) The only movable bone in the skull is the mandible. c) The bones of the skull contain foramina but no fissures. d) The facial bones provide support for the entrance of the digestive system. e) Some bones of the skull contain sinus cavities.