Ch 8 Study Guide Flashcards
actions of the sympathetic nervous system
- increase blood pressure
- stimulate adrenal glands
- dilate pupils
what does the brachial plexus do
the brachial plexus supplies motor impulses to the shoulder
what kind of reflexes is a knee jerk reflex
- simple reflex
- spinal reflex
- stretch reflex
the correct order of a impulse conducting through a reflex arc
receptors –> sensory neuron –> spinal cord –> motor neuron –> effector
where do motor impulses travel through
motor impulses travel through the spinal cord in the descending tract
what does the central canal of the spinal cord contain
the central canal of the spinal cord contains Cerebrospinal Fluid (CSF)
what part of the nervous system that consists of all the spinal nerves and cranial nerves
Peripheral Nervous System
what is the division of the nervous system that exclusively contains the skeletal muscle
somatic nervous system
how many pairs of cervical spinal nerves
8
how many pairs of spinal nerves
31
where do sensory impulses enter in the spinal cord
dorsal horn of spinal cord
what kind of nervous tissue is grey matter
nerve cell bodies and dendrites
what kind of nervous tissue is white matter
myelinated nerve fibers (axons)
what is a neurotransmitter
a chemical messenger; crosses the synapse
what is a point of junction between 2 nerve cells
synapse
which nerve impulses conduct faster in axons
nerve impulses that are coated with myelin
which ions enter the neuron through channels during depolarization phase of the action potential
sodium ions
what is a dendrite
a branched extension of a neuron that receives signals from other neurons and transmits those signals to the body
what is the scientific name for a nerve cell
neurons
where do the impulses travel from a dendrite
travel toward the cell body
what are the components of the voluntary or somatic nervous system
afferent (sensory) nerves and efferent (motor) nerves
what are the components of the parasympathetic nervous system
cranial and spinal nerves
what are the components of the sympathetic nervous system
- preganglionic neurons
- sympathetic ganglia
- postganglionic neurons
what are the components of the central nervous system
brain and spinal cord
