Atrophy
E. Cells decrease in size
P. Still functional; imbalance between protein synthesis and degradation. Essentially there is an increase in the catabolism of intracellular organelles, reducing structural components of cell
Physiologic: thymus gland in early childhood
Pathological: disuse (m...
Afferent nerves - answer sensory nerves that carry impulses from
the cells, tissues, and organs to the CNS system.
Efferent nerves - answer carry impulses from the CNS to cells,
tissues, and organs, motor nerve
Central Nervous System - answer brain and spinal cord
peripheral nervous system - answer *12 cranial nerves and 31 spinal
nerves
*further subdivided into the somatic nervous system and the
autonomic nervous system
, * PNS has the afferent and efferent pathways
Neuron - answer * basic functional unit of the nervous system
* fueled by glucose
* 3 parts to a neuron
- cell body
- dendrite
- axon
* mostly in the CNS and called nuclei in a group
* in the PNS the groups are called ganglia or plexus
* dendrites- projections that collect information and direct it to the
cell body
* Axon- conducts impulses to the next neuron, axons are covered in
myelin sheaths that are lipid material, the myelin sheaths are
interrupted in certain spots by the nodes of Ranvier
* Myelin sheath- allows impulses to flow between the nodes of
Ranvier in an increased velocity called the salutatory conduction.
* mature neurons do not replicate and injury to them is permanent
* grey matter
Sensory neurons - answer afferent neurons that carry impulses to
the CNS
motor neurons - answer efferent neurons that carry away from the
CNS
associational neurons - answer transmit impulses form neuron to
neuron and only found in the CNS
axonal reaction - answer process in which the peripheral nerves are
capable of self repair
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