Chapter 11: Fundamentals of the Nervous System and Nervous Tissue

Sensory input, integration, motor output

The nervous system has three overlapping functions. Which of the following represents a logical sequence of the three functions?

Somatic

While studying for an exam, you reach for a beverage. To extend your arm, your_________ nervous system is activated

Autonomic

The door slams shut loudly and you flinch. After a few seconds, you realize that your heart is beating very rapdily and forcefully. This response is the result of your _________ nervous system.3

Schwann Cells

Complete the following analogy: Electrical wire is to the elctrical insulating tape as peripheral nerurons are to_______

Axon Terminal

The portion of an axon that commincates with its target cell is the ____________

Myelinated Fibers

The basis for differentiation between gray matter and white matter in the CNS is the presence of _________ in white matter.

Multipolar

_____________ are the most common structural type of neuron in humans

Increases

Sodium ion concentration in the cytoplasm of a neuron ________ when its voltaged-gated sodium channels open.

ATP expenditure of the neuron

The actions of the sodium-potassium pump

Maintenance of the resting membrane potential is possible due to:

A reduction in membrane potential

Depolarization of the neuron refers to

Voltage-gated potassium channel gates open

Neurons generally repolarize once the membrane potential reaches approximately +3-mV because:

Threshold

The point at which the all-or-none principle of action potential generation is reached is termed the __________

More frequent

Stronger stimuli are interpreted when the CNS recieves ________ action potentials

The threshold is substantially elevated

Exceptionally strong stimuli could trigger action potentials

During the relative refractory period:

Synapse

The location at which a neuron interacts with its target cell (either another neuron or a muscle cell, etc.) is called the __________

Neurotransmitter exocytosis from the presynaptic neuron

During the events involved in information transfer across a chemical synpase, which of the following steps would be directly interrupted by exposing a neuron to a calcium channel blocker?

Chemical

Neurotransmitters are important in function of __________synapses