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A&P 2 ch. 12
section 12.1
20
Anatomy
Undergraduate 2
01/10/2012

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Term
endocrine system
Definition
communicates by means of chemical messengers (hormones) secreted in the blood
Term
nervous system
Definition
employs electrical and chemical means to send messages quickly b/w cells
Term
first step of CNS
Definition
through sense organs and simple sensory nerv ending
Term
2nd step of CNS
Definition
CNS processes info and relates it to past experience and determines response
Term
3rd step of CNS
Definition
CNS commands primarily to muscle and gland cells to cary out response
Term
CNS
Definition
consists of brain; enclosed and protected by cranium and vertebral column
Term
PNS
Definition
composed of nerves and ganglia
Term
nerve
Definition
bundle of nerve fibers (axons) wrapped in fibrous CT
Term
ganglion
Definition
knotlike swelling in a nerve where the cell bodies of neurons are concentrated
Term
divisions of the PNS
Definition
sensory and motor
Term
sensory division
Definition
carries signals from receptors to the CNS
Term
somatic sensory division
Definition
carries signals from receptors in skin, muscles, bones and joints
Term
visceral sensory division
Definition
carries signals mainly from viscera of the thoracic & abdominal cavities; heart, lungs, stomach, and urinary bladder
Term
motor division
Definition
carries signals from CNS to glad and muscle cells that carry out the body's responses
Term
effectors
Definition
cells & organs thatr respond to commands from the NS
Term
somatic motor division
Definition
carries signals to the skeletal muscles
Term
somatic reflexes
Definition
contractions that are under voluntary and involutionary control
Term
visceral motor division
Definition
carries signals to glands, cardiac muscle, and smooth muscle
Term
sympathetic division
Definition
tends to arouse the body for action
Term
parasympathetic division
Definition
tends to have a calming affect on body
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