The principle that increasing the end-diastolic volume results in a corresponding increase in the stroke volume is known as
A) afterload.
B) cardiac capacity.
C) cardiac reserve.
D) Frank-Starling principle.
E) expandibility.
D
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At an excitatory synapse, an action potential in the presynaptic neuron increases
a. the membrane potential of the postsynaptic cell membrane b. the permeability of the postsynaptic cell to Na+ c. the permeability of the postsynaptic cell to Cl- d. the presynaptic neuron's membrane potential e. all of the above
Which system's function for a fetus is not performed by the placenta?
a. digestive b. respiratory c. circulatory d. urinary e. none of the above; the functions of all of the systems are performed by the placenta
Stenosis (constriction) of the pyloric sphincter would interfere with
A. peristalsis. B. passage of chyme into the duodenum. C. mucus secretion. D. passage of bile and pancreatic juice into the duodenum. E. passage of a bolus into the stomach.
The respiratory membrane includes the ________
A) the capillary and alveolar epithelial sheets, and a common, mucous-coated basement membrane B) capillary wall, a thin fluid-filled space, and the alveolar wall C) capillary and alveolar walls and their fused basal laminae