11. Nervous Tissue and Nervous System

Spatial summation occurs when __________.

Which of the following statements concerning inhibitory synapses (IPSPs) is correct?

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.