Anatomy Test Chapter 7 part 1

_______ reflexes include the secretion of saliva, changes in the size of our pupils, and digestion involve the activities of smooth muscles

autonomic

The Schwann cell forms a myelin sheath around the ______.

axon

The part of the neuron that typically conducts nerve impulses away from the cell body is the _______.

axon

The organs of the central nervous system are the _____ and _______.

brian and spinal nerves

Which ion causes neurotransmitter vesicles to use with the axon's membrane during the conduction of a nerve impulse from one neuron to the next?

calcium

The nervous system is structurally subdivided into two systems: ________ nervous system and __________ nervous sytem

central; peripheral

The ability of a neuron to transmit an electrical impulse is called _____.

conductivity

The major role of the interneuron (association neuron) is to _______.

connect motor and sensory neurons in their pathways

The organs of the peripheral nervous system are the _____ and _______.

cranial nerves and spinal nerves

the neuron processes that normally receive incoming stimuli are called ______.

dendrites

Rick quickly pulled his hand away from the hot stove. This reflex is best known as a(n) _________.

flexor withdrawal reflex

Sensory receptors located in muscles and tendons are termed _____.

golgi tend organ

The two major functional properties of neurons are ______.

irritability and conductivity

Impulse condition is fastest in neurons that are

myelinated

Support cells in the central nervous system are collectively called _______.

neuroglia

The substance that is released at axonal endings to propagate a nervous impulse is called ______.

neurotransmitter

Chemical messengers held in vesicles within the synaptic terminal are ______.

neurotransmitters

The ______ chemically modify proteins in a nerve cell

nissl body

The gaps between Schwann cells found at regular intervals in peripheral system neurons are called _______.

nodes of Ranvier

which of these neuroglial cells forms the myelin sheath in the central nervous system?

oligodendrocytes

During repolarization, ________ ions move out of the cell

potassium

An action potential is caused by an influx of these ions into the cell ________.

sodium

A ______ begins an action potential in a neuron by stimulating local depolarization

sodium ion

The junction between nerve cells is the ______.

synapse

The gap between two communicating neurons is termed

synaptic cleft

Which one of the following is the correct sequence of events that correlates to the sequence of events of a nerve impulse? 1. the membrane becomes depolarized 2. sodium channels open and sodium ions diffuse inward 3. the membrane becomes repolarized 4. potassium channels open and potassium ions diffuse outward while sodium is actively transferred out of the cell

2,1,4,3

________ cells form the myelin sheaths around nerve fibers in the PNS

Schwann