When the voltage of a plasma membrane shifts from +35mV towards 0 mV, the cell is ________
A) reaching the threshold
B) depolarizing
C) exiting the threshold
D) repolarizing
E) hyperpolarizing
D
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The pituitary and thyroid glands are components of the
A) endocrine system. B) cardiovascular system. C) respiratory system. D) lymphoid system. E) digestive system.
Which cells within the alveoli form a single thin epithelial layer, located very near the capillaries, ensuring efficient gas exchange occurs between the air and the blood?
A. alveolar macrophage B. type I alveolar cells C. type II alveolar cells D. goblet cells
Which of the following is a function of the amnion?
A. It enables the embryo to develop symmetrically. B. It protects the embryo from trauma. C. It limits temperature fluctuation. D. It allows movement and supports muscle development. E. All of the choices are correct.
Using Figure 17.2, match the following:
1) Atrial depolarization.
2) Point after which pressure begins to rise in the aorta.
3) Ventricular repolarization.
4) Point that represents the "dup" sound made by the heart.