BIO 240 1.2 D

"Action Potential Reaches the Synaptic Nob" Is Synaptic transmission step ____.

1

"Voltage Gated Calcium Channels Open" Is Synaptic transmission step ____.

2

"Calcium Enters the Synaptic Knob" Is Synaptic transmission step ____.

3

"Calcium triggers exocytosis of Vesicles" Is Synaptic transmission step ____.

4

"The neurotransmitter diffuses across the synaptic cleft" Is Synaptic transmission step ____.

5

"The neurotransmitter binds to postsynaptic receptors" Is Synaptic transmission step ____.

6

The myelin sheath covers the ____.

Axon

The myelin sheath is made up of a high percentage of _______?

Lipids

The picture depicts the process of myelination in the ________ nervous system.

Peripheral

Neurofibril nodes are also called nodes of _____.

Ranvier

Before a vesicle of neurotransmitter can be released which of the following must occur? a)voltage-gated calcium channel open b)alcium must flow out of the synaptic knob c)calcium must travel across the synaptic cleft d)action potential reaches synaptic knob

a,c

The nerve impulse causes ______ in the number of calcium ions that enter the synaptic knob.

an increase

The presence of ______ ions causes the synaptic vesicles to bind to the membrane, allowing neurotransmitters to be released.

calcium

A myelinated axon has a ______ conduction velocity than an unmyelinated axon.

faster

It usually takes ______ neurolemmocyte(s) to myelinate one axon.

many

A(n) ______ is much more efficient because saltatory conduction occurs and less energy is required to maintain the RMP.

myelinated axon

The thin outer layer of the neurolemmocyte is called the ________.

neurilemma

The small spaces that interrupt the myelin sheath are called ______.

neurofibril nodes

In this figure showing the process of myelination, a(n) ______ is represented by the letter A.

neurolemmocyte

A toxin that interferes with the activity of neurons is called a

neurotoxin

Interfere with the transmission of action potentials correct Induce detrimental structural change to a neuron incorrect Alter events that occur at a synapse are examples of mechanism by which _________ may do ______.

neurotoxins, harm