Nervous System Flashcards
True or false
Neurons do not regenerate
True
Neurons love what
Sugar (glucose)
The central nervous system consists of
Consists of sensory, motor, integration
Neurons =
Nerve cells
Conduct nerve impulses away from the cell body towards another neuron
Axon
Receive stimuli or impulses from other neurons and conduct this stimulation to the body cell
Dendrites
What nerves are part of the central nervous system
Spinal nerves
The cerebellum allows the body to what
Have coordinated movements, balance, posture, and complex reflexes.
What part of the brain solves problems
Cerebrum
What part of the Brain is responsible for coordination
Cerebellum
True or false
Axons can repair themselves
True
What do dendrites do
Receive stimuli, or impulses from other neurons and conduct this stimulation to the cell body.
What do axons do
Conduct nerve impulses away from the cell body and towards another neuron
What protects and supports neurons
Neuroglia
What is a efferent process
Conduct impulses away from the cell body
What is afferent process
Conduct impulses toward the cell body
Nerve fibers =
Axons
(Mean the same thing)
Axons are often covered by a sheath of a fatty substance called what
Myelin
Nervous tissue that is made up of cell bodies and appears darker
Gray matter
Nervous tissue containing many myelinated axons
White matter
Between the adjacent glial cells are small gaps in the myelin sheath called
Nodes of ranvier
True or false
Myelinated axons conduct nerve impulses much slower than unmyelinated axons
False
(Myelinated axons conduct nerve impulses much faster)
Name the parts of a neuron
From top to bottom:
Dendrites
Cell body
Nucleus
Axon
Schwann cell
Myelin sheath
Nodes of ranvier
Telodendron
Synaptic knobs
CNS Central Nervous system is composed of
The brain and the spinal cord
PNS Peripheral nervous system is composed of
Components of the nervous system that extend away from the central axis outward, toward the periphery of the body.
Conscious or voluntary control of the skeletal muscles is referred to as a
Somatic nervous system function
An example of a somatic motor function would be
A dog turning it’s head when it’s name a called
An example of a somatic sensory function would be
Impulses being sent to CNS from receptors in the muscles, skin, eyes, or ears.
The part of the nervous system that controls and coordinates automatic functions is called
Autonomic nervous system
Autonomic motors nerves send impulses to
Smooth muscle, cardiac muscle, and glands
Somatic motor and sensory nerves send impulses to
Skeletal muscle
What is a refractory period ?
The period of time a neuron can generate another impulse
The cell can absolutely not respond to a stimulus to depolarize again
Absolute refractory period
The cell is still refractory to stimuli of normal intensity but may respond to strong stimuli
Relative refractory period
Rapid means of conducting an action potential when a depolarization wave jumps from one node of ranvier to another
Saltatory conduction