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21 Cards in this Set
- Front
- Back
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What is paraplegia? |
Paralysis of half of the body (top/bottom) |
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What is hemiplegia? |
Paralysis of half of the body (side/side) |
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What is a hematoma? |
A huge layer of blood |
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What happens to the size of the brain as a result of encephalosclerosis? |
Hardening of the brain tissues depletes water thereby causing the brain to shrink |
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What does polyneuropathy typically result from? |
Diabetes |
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What does the neurological system do? |
Directs bodily functions |
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About how many nerve cells does the human body contain? |
100 billion nerve cells |
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Do nerve cells regenerate? |
No |
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What are the two principals of why nerve cells are different from all of the other cells in the body? |
(1) excitability - the ability to respond to stimuli (2) conductivity - the ability to transmit a signal |
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Are reactions different than reflexes? |
Yes. Example of reaction: hand on hot stove Example of reflex: knee tap |
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How is a signal transmitted? |
A signal transmits from cell to cell (think hand squeezing lab) |
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What does a nerve cell equal? |
1 nerve cell = 1 neuron |
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Do signals travel one or two directions? |
Signals only travel one direction to increase speed |
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What happens without bad neurons and also with less neurons? |
The signal travels faster |
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What are the 3 types of neurons? |
(1) efferent (motor) (2) afferent (sensory) (3) interneurons |
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What are efferent (motor) neurons? |
Go from brain and spinal cord to muscles |
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What are afferent (sensory) neurons? |
From muscles to brain and spinal cord |
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What are interneurons? |
Carry and process sensory information |
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What is special about reflexes? |
Reflexes are the only function that does not send signals to the brain |
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Will reflexes be effected by a spinal cord injury? |
No |
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How is an interneurons different from efferent and afferent neurons? |
Interneurons do not go to and from the brain. They typically connect efferent and afferent neurons in the spinal cord during reflexes |
