Which of the following statements is part of Starling's law of the heart?
a. a slightly larger and better-contracting heart will increase stroke volume
b. the greater the ventricular stretch, the more forceful the contraction
c. an increase in venous return will increase blood flow into the heart
d. all of the listed responses are correct
Ans: d. all of the listed responses are correct
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Which type(s) of muscle tissue is/are found in the walls of hollow internal organs?
A. Smooth B. Skeletal C. Cardiac D. Both smooth and skeletal
What is a local potential?
A. The flow of electricity begun by stimulating the cell body of a neuron B. The flow of electricity begun by stimulating the dendrite of a neuron C. The flow of electricity begun by stimulating the axon of a neuron D. None of these answers are correct
During contraction of heart muscle cells ________
A) all of the calcium required for contraction comes from storage in the sarcoplasmic reticulum B) some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores C) calcium is prevented from entering cardiac fibers that have been stimulated D) the action potential is prevented from spreading from cell to cell by gap junctions
Which of the following factors would decrease the GFR?
a. a fall in plasma protein concentration. b. an obstruction such as a kidney stone in the tubular system, which increases Bowman's capsule hydrostatic pressure. c. vasodilation of the afferent arterioles. d. two of these answers. e. all of these answers.