Flashcards in Chapter 12: Nervous Tissue (Part 1) Deck (100)
What systems maintain the internal coordination? (2)
endocrine & nervous system
Which system communicates using chemical messengers secreted into the blood?
Which system employs electrical & chemical means to send messages?
3 basic tasks of the nervous system
1. Receive info about changes in the body & transmit info to spinal cord & brain
2.Brain & spinal cord process the info and determine response
3.Brain & spinal cord issue commands to muscles & glands to carry out response
What are the 2 subdivisions of the nervous system?
-central nervous system (CNS)
-peripheral nervous system (PNS)
What is included in the CNS?
spinal cord & brain
What is the PNS composed of?
ganglia & nerves
a bundle of nerve fibers wrapped in fibrous connective tissue
a knotlike swelling in a nerve where neuron cell bodies are concentrated
What are the 2 subdivisions of the PNS?
sensory & motor
sensory afferent division
carries sensory signals from various receptors to the CNS
somatic sensory division
carries signals from receptors in the skin, muscles, bones, & joints
visceral sensory division
carries signals from the viscera of the thoracic and abdominal cavities
towards the CNS
away from the CNS
motor efferent division
carries signals from the CNS to gland and muscle cells that carry out body responses
cells and organs that respond to commands from CNS
somatic motor division
carries signals to skeletal muscles
visceral motor division is also known as_____
autonomic nervous system
involuntary that carries signals to glands, smooth muscle
visceral motor division is divided into
sympathetic & parasympathetic system
"fight or flight" response
tends to arouse body for action
"rest or digest"
tends to have calming effect
respond to environmental changes called stimuli
properties of neurons (3)
neurons respond to stimuli by producing electrical signals
when electrical signal reaches end of nerve fiber and a chemical is secreted
afferent; interneurons; efferent
-lie entirely within the CNS
-carry out the integration function of the CNS
-90% of neurons
ability to process, store, and retrieve info to make decisions