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Cards In This Set
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____ refers to maitenance of a relatively stable internal environment.
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None of these
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Severe disruptions in homeostasis can lead to..
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Pain, illness, pathophysiology, and death
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Positive feedback is the primary homeostatic control mechanism and works to return a deviation back to the set point
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False
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____ are cell to cell connections through which materials can pass from the cytoplasm of one cell into the cytoplasm of an adjacent cell.
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Gap Junctions
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Because of the presence of tight junctions, passage of materials across an epithelial barrier must take place through the cells, not between them
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True.
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Which of the following is not a component of a second messenger pathway.
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Steroids
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Secondary active transport in which two substances pass through the membrane in the same direction is called co transport
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True
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The pathway in which proteins are synthesized and stored in secretory vesicles prior to secretion is..
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Regulated Exocytosis
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Which process is responsible for a cell swelling when placed in a hypotonic solution?
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Osmosis
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Net movement of water due to an osmotic pressure is counteracted by which force?
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Hydrostatic pressure
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Exocytosis of secretory vesicles from neuron terminals is triggerd by the entry of ___ into the cytoplasm.
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Ca2+
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Which of the following statements about the Na+- K+ pump is incorrect?
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It helps decrease Na+ and K+ concetration gradients across the plasma membrane
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A membrane potential ..
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Refers to a difference in electrical charge on opposite sides of a membrane.
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Graded potentials..
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All of the above:
are local changes in membrane potential
occur in varying degress of magnitude
die out over short distances
spread by passive current flow
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A change in membrane potential from -70 mV to -60 mV is an example of ..
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Depolarization
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