12.2 Nervous system

The structure that carries action potentials over long distances are called

Axons

Effects produced by the sympathetic branch of the autonomic nervous system include

dilation of the pupils. *

Effects produced by the parasympathetic branch of the autonomic nervous system include

increased secretion by digestive glands.

In general, the nervous system

is fast acting, with brief effects. *

Opening of voltage-gated potassium channels in the membrane of a neuron immediately results in

repolarization.

Which of the following lists the parts of a reflex arc in the correct order?

sensory neuron, interneuron, motor neuron

The structures where nervous system signals are passed from one neuron to the next are called

synapses. *

The resting potential of a neuron is ________.

-70 mV

Identify the correct sequence of steps in the generation of an action potential. 1. Opening of sodium channels and rapid depolarization 2. Closing of sodium channels and opening of potassium channels 3. Depolarization to threshold 4. Closing of potassium channels

3, 1, 2, 4 *

The central nervous system (CNS) is made up of the

Brain and spinal cord *

Interneurons

Connect other neurons *

The nervous system

Controls other organ systems

The branching structures that, together with the cell body, are sensitive to chemical, mechanical, or electrical stimulation are called

Dendrites

Opening of voltage-gated sodium channels in the membrane of a neuron immediately results in

Depolarization

All of the nervous tissue outside of the central nervous system comprises the ________ nervous system.

Peripheral *

Ascending pathways

carry sensory information to the brain.