In the process of diffusion, net movement of substances is always from a region
A. of lower concentration to a region of higher concentration.
B. outside the cell to a region inside the cell.
C. inside the cell to a region outside the cell.
D. of higher concentration to a region of lower concentration.
E. None of the choices are correct.
Answer: D
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Duodenal gland secretion prevents
A. digestive enzyme release. B. release of bile from the liver. C. irritation of the duodenal mucosa by acidic chyme and digestive enzymes. D. the release of insulin. E. peristalsis.
A neuron is exposed to a drug that completely blocks voltage-gated potassium channels, but has no effect on non-gated channels or the sodium-potassium pump. Which of the following describes the effect on action potential generation?
A. Resting potential would not be maintained, as potassium could not leak out of the neuron. B. Repolarization will never occur after threshold is crossed and sodium will continue to flow into the neuron. C. Repolarization will still occur, but at an inefficiently slow rate. D. Threshold will never be crossed, and therefore an action potential will never be generated.
The "fluid-filled, hollow ball of cells" stage of development is the blastocyst
Indicate whether the statement is true or false
Sympathetic stimulation of the urinary bladder relaxes the activity of this organ
Indicate whether the statement is true or false