Test Bank For Human Physiology From Cells To Systems 3rd Edition by Lauralee Sherwood

Test Bank For Human Physiology From Cells To Systems 3rd Edition by Lauralee Sherwood

Chapter 2

Indicate whether the statement is true or false.

1. Secretory vesicles are about 200 times larger than transport vesicles.

a. True

b. False

2. Sheets of epithelial cells are joined by gap junctions.

a. True

b. False

3. The stronger the stimulus, the greater the frequency of action potentials generated in a neuron.

a. True

b. False

4. Temporal summation occurs when EPSPs from several different excitatory presynaptic inputs occur simultaneously.

a. True

b. False

5. When equilibrium is achieved and no net diffusion is taking place, there is no movement of molecules.

a. True

b. False

6. Action potentials can be summed.

a. True

b. False

7. Action potentials are initiated at the axon hillock region because it has the lowest threshold voltage.

a. True

b. False

8. The period of time following an action potential during which a membrane cannot be restimulated, no matter how strong the stimulus, is known as the subminimal response period.

a. True

b. False

9. If a concentration or electrical gradient is present for a given substance, the substance will always passively permeate the membrane.

a. True

b. False

10. A postsynaptic neuron can either excite or inhibit a presynaptic neuron.

a. True

b. False