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