When a neuron changes its ion permeability from the resting state,
A) a variety of gated ion channels may open or close, Na+ channels may open, allowing Na+ to enter the cell, and K+ channels must open, allowing K+ to enter the cell.
B) a variety of gated ion channels may open or close.
C) K+ channels must open, allowing K+ to enter the cell.
D) Na+ channels may open, allowing Na+ to enter the cell.
E) only a variety of gated ion channels may open or close and Na+ channels may open, allowing Na+ to enter the cell.
E) only a variety of gated ion channels may open or close and Na+ channels may open, allowing Na+ to enter the cell.
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Movement of large molecules into a cell is called ________.
A. bulk transport B. endocytosis C. exocytosis D. Both endocytosis and bulk transport are correct.
When fatty acids contain one or more double bonds, they are considered
A. emulsified. B. unsaturated. C. saturated. D. synthesized.
You are performing an experiment in a research lab. In this experiment you take cells and remove all of their cell membranes, in order to collect all the internal contents into a tube. What is the most accurate term for the content of your tube?
A. Cytoplasm B. Phospholipids C. Cell organelles D. Nuclei E. Intracellular fluid
Which of the following describes a severe and often fatal disorder caused by exposure to high temperatures?
a) Heat cramps b) Heat exhaustion c) Heat prostration d) Heatstroke e) None of these