1893487
Description
Flashcards by itstinachen, updated more than 1 year ago
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Created by itstinachen
over 9 years ago
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| Question | Answer |
| Central Nervous System | - brain and spinal cord |
| Peripheral Nervous System | carry info between CNS and rest of body - ganglion cell and nerves |
| Somatic Nervous System | Nerves running to organs at the body surface -Controls skeletal muscles, bones and skin -Voluntary action - Ex. moving away from something warm |
| Autonomic Nervous System | Nerves running within inner organs - Controls smooth muscles, cardiac muscles, and glands - Involuntary action - Ex. Blinking |
| Sympathetic Nervous System | Prepares body for stress - Nerves stimulate internal organs for action - Ex. Fight or flight |
| Parasympathetic Nervous System | Returns body to normal after adjustments to stress -Nerves cause inhibition of reactions in internal organs -Conserves energy |
| Nervous System Cells | Glial cells: non-conducting - support cells for neuron Neurons: - conduct nerve impulses - 3 types: sensory, motor, interneuron |
| - Sensory (afferent) neurons | o have sensory receptors that detect stimuli from environment and relay it to CNS o highly sensitive to a particular type of stimulation Ex. touch, light, chemicals o located in clusters called ganglia (sing. ganglion) outside of the spinal cord |
| Motor (efferent) neurons | Excited by other neurons and conduct impulses from CNS to effectors such as muscles, glands, and organs |
| Interneurons | o links neurons together o integrate and interpret sensory information and relay to motor neurons o nervous system consists mostly of these |
| Nodes of Ranvier | Gaps between myelin sheath o Impulses jump from node to node → speed up impulse - Impulses move faster in myelinated neurons - Larger the diameter of axon, faster the speed of impulse |
| Myelin sheath | - Insulated covering over axon -Prevents loss of charged ions from nerve cell -Produced by Schwann cells (special glial cells) |
| Neurilemma | Membrane surrounding the axon of some neurons Promote regeneration of damaged axons |
| white matter | Nerves that have myelin sheath and neurilemma, can regenerate |
| grey matter | without myelin sheath and neurilemma are called grey matter (don’t regenerate; damage is permanent) |
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