Exam 3

Which is not a component of the PNS?

• brain

• cranial nerves

• spinal nerves

• ganglia

Supporting cells surround and wrap _______

What are the receptive regions of a neuron called?

• axons

• dendrites

• axon terminal

• cell body

What region of the brain contains the thalamus and hypothalamus

• cerebral hemisphere

• cerebellum

• brain stem

• diencephalon

_______ is an increase in membrane potential

What does a stimulus open during a graded potential

• ion channels

• gated ion channels

• intermembrane proteins

What type of ion channels have 1 gate and 2 states?

• Na+

• Ca+

• K+

• K-

What is step 1 of an action potential?

• depolarization

• hyperpolarization

• resting state

• hyperpolarization

During resting state, all gated channels are _______

The critical level for an action potential, around -55 to -50 mV is called the _________