Podcast
Questions and Answers
What is the resting membrane potential of a neuron?
What is the resting membrane potential of a neuron?
- About -30mV
- About -70mV (correct)
- About +70mV
- About -90mV
What happens during the depolarization phase of an action potential?
What happens during the depolarization phase of an action potential?
- The potential becomes more negative
- The potential moves from less negative to more negative
- +30mV triggers Na+ and K+ channels to close
- Na+ channels open and K+ channels close (correct)
What is the threshold potential that needs to be met to start depolarization?
What is the threshold potential that needs to be met to start depolarization?
- Summate to a depolarization of 5mV or more
- Summate to a depolarization of 20mV or more
- Summate to a depolarization of 10mV or more
- Summate to a depolarization of 15mV or more (correct)
What characterizes hyperpolarization in a neuron's action potential?
What characterizes hyperpolarization in a neuron's action potential?
What are EPSPs and IPSPs in relation to the threshold potential?
What are EPSPs and IPSPs in relation to the threshold potential?
What is the role of myelin in the nervous system?
What is the role of myelin in the nervous system?
What is the role of an IPSP in a neuron?
What is the role of an IPSP in a neuron?
What does an increase of Calcium into the axon terminal signal?
What does an increase of Calcium into the axon terminal signal?
What is the sequence of events in a reflex arc?
What is the sequence of events in a reflex arc?
What happens during neurotransmitter release at the synapse?
What happens during neurotransmitter release at the synapse?
During which phase of an action potential does the potential move from less negative to more negative?
During which phase of an action potential does the potential move from less negative to more negative?
What triggers Na+ channels to close and K+ channels to open during an action potential?
What triggers Na+ channels to close and K+ channels to open during an action potential?
Which process describes the way an electrical impulse skips from node to node down the full length of an axon?
Which process describes the way an electrical impulse skips from node to node down the full length of an axon?
What is the voltage needed to be met to start depolarization during an action potential?
What is the voltage needed to be met to start depolarization during an action potential?
What characterizes the resting membrane potential of a neuron?
What characterizes the resting membrane potential of a neuron?
What is the role of myelin in the nervous system?
What is the role of myelin in the nervous system?
What triggers Na+ channels to close and K+ channels to open during an action potential?
What triggers Na+ channels to close and K+ channels to open during an action potential?
What is the voltage needed to be met to start depolarization during an action potential?
What is the voltage needed to be met to start depolarization during an action potential?
What characterizes hyperpolarization in a neuron's action potential?
What characterizes hyperpolarization in a neuron's action potential?
During which phase of an action potential does the potential move from less negative to more negative?
During which phase of an action potential does the potential move from less negative to more negative?
In chemical signaling, which of the following is responsible for making the extracellular fluid more positive by moving 3 sodium ions out of the cell?
In chemical signaling, which of the following is responsible for making the extracellular fluid more positive by moving 3 sodium ions out of the cell?
In the mechanism of a synapse, which process involves the removal of neurotransmitters from the synaptic cleft and is part of the cancellation of the signal?
In the mechanism of a synapse, which process involves the removal of neurotransmitters from the synaptic cleft and is part of the cancellation of the signal?
What is the primary function of myelin in the nervous system?
What is the primary function of myelin in the nervous system?
What role does calcium play in chemical signaling at the synapse?
What role does calcium play in chemical signaling at the synapse?
Which division of neurons causes an effect and sends messages out from the peripheral nervous system (PNS)?
Which division of neurons causes an effect and sends messages out from the peripheral nervous system (PNS)?
