Which send blood to either esophageal arteries or esophageal branches to supply the esophagus with blood?
A. Thoracic aorta
B. Bronchial arteries and left gastric artery
C. Thoracic aorta and left gastric artery
D. Bronchial arteries
E. Left gastric artery
Answer: C
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The squamous suture is the boundary between which bones?
A) frontal and nasal B) frontal and parietal C) nasal and vomer D) frontal and sphenoid E) parietal and temporal
Which of the following is a function of hCG?
A) It breaks down the corpus luteum. B) It stimulates the release of enzymes that enable the blastocyst to implant into the endometrium. C) It helps protect the blastocyst against being rejected. D) It prevents the developing placenta from secreting hormones.
Why are action potentials sometimes described as being "all-or-none" in character?
A. The rate of propagation of an action potential down an axon is independent of stimulus strength. B. They are associated with an absolute refractory period. C. A supra-threshold stimulus is required to stimulate an action potential during the relative refractory period. D. An action potential occurs whenever a suprathreshold stimulus occurs, and its amplitude does not vary with the size of a stimulus, as long as the membrane is not in the refractory period. E. Action potentials are always the same size, even when ion gradients vary in size.
An abnormal shortening of a muscle that is not stimulated by the nervous system is called ________.
Fill in the blank(s) with the appropriate word(s).