02 Feb Damaged myelin on an

QUESTION 1

1. The generation or creation of an action potential depends on the strength of the stimulus a neuron receives.

True

False

QUESTION 2

1. Action potential is unique to neurons and muscle cells. Other body cells do not use this process.

True

False

QUESTION 3

1. Which portion of the neuron processes information?

Dendrites

Soma

Myelin

Axon

QUESTION 4

1. As long as neurotransmitters are bound to a receptor, ion channels remain open.

True

False

QUESTION 5

1. During an action potential, positive ions move into the cell as the depolarization spreads down the axon.

True

False

QUESTION 6

1. Which statement is true regarding the action potential process?

Depolarization occurs because voltage gated K+ channels allow K+ ions to rush into the cell

The repolarization phase must occur prior to depolarization

The action potential process only occurs at the nodes of Ranvier in myelinated axons

Hyperpolarization allows for Na+ and K+ ions to move into and out of the cell

QUESTION 7

1. Which statement is true regarding neurons?

They are only found in the central nervous system

Dendrites pass information from the neuron to another cell

All axons have myelin sheaths surrounding them

The action potential is transmitted from the cell body to the axon terminal

QUESTION 8

1. During relative refractory period, a neuron cannot create another action potential to a stimulus no matter how strong or intense that stimulus is.

True

False

QUESTION 9

1. Which choice is true regarding neuroglia cells?

The majority of neuroglia cells are found in the peripheral nervous system

Schwann cells function are located in the central nervous system

Oligodendrocytes produce myelin sheaths

Astrocyte cells protect the neurons by acting almost like an immune cell

QUESTION 10

1. Which statement is true regarding the neuron synapse?

The presynaptic and postsynaptic neuron membranes are not physically separated

Binding of a neurotransmitter on the postsynaptic neuron membrane can generate an action potential in that neuron

The binding of a neurotransmitter always causes an excitatory effect on that cell, never inhibitory

The human body only uses one type of neurotransmitter in all of its synapses

QUESTION 11

1. The autonomic nervous system is a sub-division of sensory (afferent) division?

True

False

QUESTION 12

1. Inhibitory synapses cause depolarization, leading to the possibility of an action potential formation.

True

False

QUESTION 13

1. Which of the following ions rushes into the axon terminal, causing the release of neurotransmitters into the synaptic cleft?

Sodium

Potassium

Magnesium

Calcium

QUESTION 14

1. Which statement is true regarding the nervous system?

Neuroglia cells are only responsible for providing immunity to the nervous cells

Depolarization is the reduction of the membrane potential; going from negative to a more positive charge

Neurons can communicate with other cells without the use of neurotransmitters

Damaged myelin on an axon has no effect with its ability to transmit an action potential

QUESTION 15

1. Which statement is true regarding neurons?

Both the axons and dendrites receive information from other neurons and cells

The nucleus of the neuron is located in the axon

Neurotransmitters are released from the axon terminal(s)

Myelin sheaths provide protection to the axons but slow the nerve impulse (action potential) through it