11. Nervous Tissue and Nervous System

___________ are all identical, whereas __________ can be larger or smaller depending on the level of stimulation.

Which of the following statements about graded potentials is FALSE?

Assume that an EPSP is being generated on the dendritic membrane. Which will occur?

a. Specific Na⁺ channels will open.

b. Specific K⁺ channels will open.

c. A single type of channel will open, permitting simultaneous flow of Na⁺ and K⁺.

d. Na⁺ channels will open first and then close as K⁺ channels open.

a. Describe the composition and function of the cell body.

b. How are axons and dendrites alike? In what ways (structurally and functionally) do they differ?

State the all-or-none principle of action potentials.