BIOL 1201 Chapter : Action Potential Worksheet

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azuremammoth471

15 Mar 2019

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All cells have a membrane potential, but only certain cells (muscle and neurons) have the ability to generate changes in their membrane potentials (excitable cells). Excitable cells have special ion channels called gated ion channels. If the depolarization is great enough it will stimulate an action potential. (reaches a threshold level) There are both na+ and k+ voltage gated channels, these differ not only in the ion allowed to pass through, but also in the speed and the number of gates in each channel. Na+ two gates activation gate (open) very fast. The action potential is the result of a rapid depolarization of the membrane that is then propagated along the neuronal membrane. All action potentials are the same, it is an all or none response. Larger diameter sheathing portions of the membrane in myelin. The action potential normally moves in one direction from the cell body to the tips of the axon.

Related Questions

Why do ion channels not function like open pores?

What is membrane potential?

How do K⁺ leak channels work? Why is the membrane potential of a resting cell negative?

What is patch clamp recording? What is one of the major insights gained from patch clamp reporting experiments?

Compare and contrast the three types of gated ion channels.

Be familiar with the different parts of a neuron.

During an action potential, what happens to the membrane potential, voltage-gated Na⁺ channels, Na⁺ ions, voltage gated K⁺ channels, K⁺ ions, and Na⁺-K⁺ ion pumps?

When an action potential reaches a synapse, what happens to the Ca²⁺ channels, Ca²⁺ ions, neurotransmitters, transmitter-gated ion channels, and the post synaptic neuron?

What effect do excitatory or inhibitory neurotransmitters have on postsynaptic cells?

What is an example of a mechanically gated ion channel?

Some cells of the body spontaneously generate action potentials. For these cells, they do not remain at a given resting membrane potential, instead suddenly depolarizing to threshold. The mechanism of spontaneous depolarization results from a combination of changing gated channel permeability and intracellular protein levels (second messengers, such as cAMP). Medications aimed at delaying or accelerating this spontaneous depolarization come in many different forms, targeting different aspects of these channels or second messenger systems. Answer the following questions.

If one of the ion channels involved in spontaneous depolarization are K+ channels, are they spontaneously opening or closing to cause depolarization? Explain.

3. Which of the following is TRUE about a motor neuron?

		It passes information to another motor neuron.
		It passes information to another neuron.
		It stimulates cells associated with muscles or glands.
		It cannot generate an action potential.

2. Choose the immediate event that needs to occur for a nerve to fire an action potential.

		Voltage-gated potassium ion channels need to open.
		A threshold potential will need to be reached.
		Depolarization will need to be happen.
		Voltage-gated sodium ion channels need to close.

1. Choose the TRUE statement with respect to axons and/or dendrites.

		Dendrite is the location that a neurotransmitter moves into the synamptic cleft.
		Action potentials travel along the axon of a neuron.
		A neuron will typically have more axons than dendrites.
		More than one is correct

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BIOL 1201 Chapter : Action Potential Worksheet

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