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3 Overlapping Functions:
a) Sensory Input via millions of sensory receptors…senses changes inside &outside the body
b) Integration– Analyzes sensory info, stores info, makes decisions; it interprets the infoand decides how to react
c) Motor Output – Activates effector organs (muscles, glands) to respond
2 Major Parts of the NervousSystem:
1. Central Nervous System - Brain & Spinal Cord
2. Peripheral Nervous System – Parts outside the central nervous system
Sensoryaka (Afferent) Division
Convey info FROM sensory receptors TO the CNS
Afferent – going in
Motor aka (Efferent) Division
Carry impulses from CNS to effector organs
Efferent – going out
Somatic Motor
Voluntary, conscious control of skeletal myos
Autonomic Motor
“Visceral” nerve fibers (involuntary) * Motor fibers that conduct nerve impulses from CNS to smooth & cardiac myo & glands
2 Classes of Cell in Nerve Tissue:
1. Neuron– “THE” Functional Cell
2. Neuroglia– aka Glial Cell (Glia); supportive cell, does not conduct impulses; 6different cells (4 in CNS (Central Nervous System), 2 in PNS (PeripheralNervous System))
CNS Neuroglia
–Outnumber neurons in CNS 10-1
-Make up ½ the mass of the brain
Astrocytes
(CNS Neuroglia)
- Support & brace neurons
- Anchor neurons to blood vessels
- Guide the migration of young neurons
- Help form synapse [synaptic cleft/gap..place of joining]
-Control chemical environment around neurons by buffering K+ and recapturing neurotransmitters
Microglia Cells
-Cantransform to macrophage
-By the useof phagocytosis, can get rid of microorganisms & cellular debris
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