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28 Cards in this Set
- Front
- Back
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Nervous system provides
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Swift, brief responses to stimuli
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Endocrine System Adjusts
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metabolic operations and directs long-term changes
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Nervous system carries
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•sensory information in (afferent info)
•Information processing (brain / spinal cord ) • motor response out (efferent info ) |
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Nervous System Organs
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Brain, spinal cord, sensory receptors, and nerves
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CNS contains
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neural tissue, connective tissues, and blood vessels
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CNS Functions
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Process and coordinate sensory data, motor commands, and higher functions of brain
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PNS includes
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Neural tissue outside the CNS. Composed of nerves and ganglia
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What is a NERVE?
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bundle of nerve fibers wrapped in fibrous connective tissue
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What is a GANGLION?
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knot - like swelling in a nerve where neuron cell bodies are concentrated
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PNS Functions
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Deliver info to the CNS (afferent) &
carry motor commands to peripheral tissues and systems (efferent) |
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How many pairs of nerves are there?
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43.
12 Cranial & 31 Spinal |
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Receptors do what?
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Detect changes or respond to stimuli w/ neurons
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Effectors do what?
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Respond to efferent signals usually w/ muscles and glands
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Somatic nervous system does what?
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controls skeletal muscle contractions
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Autonomic nervous system does what?
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controls subconscious actions & contractions of muscle
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The Sympathetic division of the ANS has what?
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A stimulating effect
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The parasympathetic division of the ANS has what?
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A relaxing effect
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What are the 2 divisions of the ANS?
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Sympathetic & Parasympathetic
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What happens with CONDUCTIVITY?
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Neurons respond to stimuli by producing action potentials quickly propagated down membranes
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What does excitability (irritability) do?
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Respond to environmental changes by producing action potentials
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What happens with SECRETION?
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When an action potential reaches the end of an axon, a neurotransmitter is secreted crossing the synapse & stimulating the next cell
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What are the 3 properties of Neurons?
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Excitability, Conductivity, and Secretion
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What is a multi-polar neuron?
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1 axon & multiple dendrites, most common
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What is a bi-polar neuron?
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One axon and one dendrite
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What is a uni-polar neuron?
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Single process leading away from the soma
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What is a anaxonic neuron?
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Many dendrites & NO axon
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What is the Axon Hillock?
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Where the axon and cell join. Spot where action potential is 1st generated
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What is collateral in a neuron?
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Where the axon splits
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