Explain how cardiac tetanus is prevented
What will be an ideal response?
Tetanus cannot occur normally in cardiac muscle because the absolute refractory period is significantly long. It lasts during the entire plateau phase of the action potential and occurs because the voltage-gated sodium channels responsible for the rising phase of the action potential remain closed throughout the plateau phase. This is physiologically important because the normal function of the heart relies on alternating contraction and relaxation. If tetanus were to occur, the heart chambers could not fill and empty in a synchronized fashion and cardiac function would stop.
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Which of the following changes occur during the third trimester?
A) Completion of pulmonary branching and alveolar formation. B) Formation of the plicae of the intestines. C) Completion of the formation of the nephrons. D) In male fetuses, the testes descend. E) All of the answers are correct.
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secretion of waste materials reabsorption of over 90 percent of water from the tubule reabsorption of useful organic substrates All of the listed responses are correct.
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Fill in the blank(s) with the appropriate word(s).