Term
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Definition
motor neuron and all the muscle cells it services |
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Term
motor unit is the basic _____________ of the muscle |
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Definition
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Term
Motor neurons are connected to the rest of the nervous systerm via _____________ |
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Definition
a complex network of neurons |
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Term
neurons and muscle cells are activated by changing their_______ |
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Definition
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Term
Electrical charges can or can't jump between cells |
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Definition
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Term
neurons communicate with other neurons and with muscle cells by releasing |
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Definition
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Term
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Definition
chemcials released by a neuron which cause either excitation, facilitation, or inhibition |
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Term
neuron activations or excitations are really waves of ________________ caused by ______ influx |
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Definition
depolarization; Na+ influx |
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Term
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Definition
going from negative to positve |
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Term
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Definition
going from positive to negative |
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Term
Two types of Sodium Gates or Channels |
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Definition
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Term
the Na+ channels allow Na+ entry and |
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Definition
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Term
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Definition
least numerous
found mainly in the nerve cell body and dendrties
gates are unlocked by neurotransmitters |
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Term
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Definition
most numerous
neuronal axons and distal to the synapses
opened when resting membrane potential exceeds a specific threshold voltage (~60mV) |
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Term
It is the opening and closing of the electrical gates that causes the necessary wave of |
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Definition
depolarization called action potential |
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Term
before another impulse can be sent down an axon, the nerve must |
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Definition
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Term
repolarization is faciliated by the _____ which allows |
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Definition
Na-K pump; NA+ out and K+ in |
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Term
The Na-K pump must have energy in the form of |
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Definition
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Term
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Definition
raising the RMP above the normal potential, thereby increasing rhe likelihood that succeeding neurotransmitters releases will cause the potential to exceed threshold |
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Term
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Definition
lowering the RMP below the normal potential, thereby decreasing the likilihood of reaching the threshold. usually prevents neuron from acitvating target |
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Term
Most common excitatroy neurotranmitters |
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Definition
norepinephrine and acetylcholine (nerve to muscle) |
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Term
most common facilitory neurotansmitters |
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Definition
norepinephrine and acetylcholine (in lower amounts) |
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Term
most common facilitory neurotransmitters |
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Definition
norepinephrine and acetylcholine (in lower amounts) |
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Term
norepinephrine activates the __ _____ which produces _______ |
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Definition
adrenal medula; epinephrine |
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Term
epinephrine also is known as |
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Definition
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Term
most common inhibitory neurtransmitter |
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Definition
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