Exam 19: Nerve Signaling

Excitatory neurotransmitters are most likely to initiate an action potential.

Neurotransmitters are released in a synapse and bind to:

Match each term with its definition or description. -Space between the presynaptic and postsynaptic cells

Action potentials usually occur in the axon of the cell.

The basic tenet of the neuron doctrine is that neurons function as independent units connected by chemical synapses.

The presence of numerous electrical synapses in the nervous system supports the neuron doctrine regarding the functioning of the nervous system.

Enkephalins and endorphins are subclasses of amines that are pain relievers.

In a myelinated fiber, the action potential jumps from one node of Ranvier to the next.

Compared with the outside of the neuron, the inside has a(n) ____ charge.

The relative refractory period can determine the strength of a stimulus even if the axon functions on the "all-or-none" law.

When an impulse reaches a synapse:

When epinephrine and norepinephrine are released into the bloodstream, they are called hormones instead of neurotransmitters.

A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential.

Match each term with its definition or description. -Type of synapse in which the signal from the presynaptic to postsynaptic cell is carried by a neurotransmitter

Myelinated axons without gaps in the myelin (nodes of Ranvier) conduct impulses more efficiently than axons with nodes of Ranvier.

When a neuron is resting, the inner surface of its plasma membrane is slightly positive compared with its outer surface.

Absolute refractory periods occur in the axon of the cell; relative refractory periods occur in the dendrite or soma of the cell.

Myelinated fibers conduct impulses faster than unmyelinated fibers.

Describe the process of impulse conduction across a synapse.

If a membrane exhibits a membrane potential, it is said to be polarized.