Term
| What is the resting membrane potential permeable to? |
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Definition
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Term
| What is the reason that the resting membrane potential is at -70mV |
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Definition
| Because of the sodium potassium pumps |
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Term
| How do the sodium potassium pumps keep functioning? |
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Definition
| With energy in the form of ATP |
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Term
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Definition
| Occurs when inside the membrane potential becomes less negative(more positive), it passes the threshold of -50mv. This helps open up sodium channels. its required for nerve impulses |
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Term
| Explain hyperpolarization |
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Definition
| This occurs when resting membrane potential becomes more negative -70mV to -90mV and needs a stronger signal for an action potential. |
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Term
| Which causes inhibition of muscles? Depolarization or Hyperoplarization? |
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Definition
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Term
| What is graded potential? |
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Definition
| attempt to communicate neurologically to propogate an action potential but fails to do so because it cant pass threshold. |
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Term
| What is action potential? |
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Definition
| When it does pass threshold to depolorize and there is an exchange of ions |
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Term
Which can excite or inhibit a neuron?
a) action potential
b) graded potential |
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Definition
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Term
Which can ONLY excite a neuron?
a) action potential
b) graded potential |
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Definition
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Term
| What does potassium efflux to the membrane potential? |
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Definition
| It causes an inhibtory hyperpolarization |
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Term
| What does an sodium influx do to the membrane potential? |
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Definition
| It causes an excitatory depolorization |
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Term
| What are localized changes in the membrane potential called? |
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Definition
| It is called graded potential |
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Term
| Can a strong Graded potential lead to action potential? |
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Definition
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Term
| Action potential will be propogated down the _____ and transmitted to the next _____ |
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Definition
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Term
| Once an action potential starts, is there a way to inhibit it? |
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Definition
| No, it is an all-or-none principle |
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Term
| Threshold potential can vary depending on the open ______ channels |
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Definition
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Term
| Is it easier to activate a smaller alpha motor neuron or a larger motor neuron? |
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Definition
| Smaller alpha motor neuron because it would take a lot less stimulus to activate |
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Term
| All Alpha motor neurons have the same amount of open sodium channels per surface area. T or F? |
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Definition
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Term
| does a smaller alpha motor neuron have less open sodium channels vs. a larger motor neuron? |
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Definition
| yes, smaller akpha motor neurons have less open sodium channels |
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Term
| What are the two important neurotransmitters we need to know for exercise physiology? |
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Definition
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Term
| What is ACH and why is it important? |
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Definition
| ACH helps stimulate skeletal muscle contraction and helps mediate parasymphatetic response |
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Term
| Noripheniphrine helps mediate symphatetic nervous system response. T or F |
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Definition
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