BIOM 2000 Lecture Notes - Perineurium, Axon Hillock, Sensory System

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beigetiger812

29 Oct 2012

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Neuron basic cellular unit; an electrically excitable cell that processes and transmits information by electrical and chemical signalling. Dendrite receive; the branched projections of a neuron that act to conduct the electrochemical stimulation received from other neural cells to the cell body or the soma of the neuron from which the dendrites project. Axon message sent, action potential; long slender projection of a nerve cell, or neuron that typically conducts electrical impulses away from the neuron"s cell body. Synapse releases message; a structure that permits a neuron to pass an electrical or chemical signal to another cell. Resting membrane potential to send sodium out of cell and potassium in; (resting voltage); relatively static. Depolarization of the axon membrane start of the sodium channels being opened. Action potential short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a consistent trajectory.

Related Questions

26. When it comes to ligand-gated ion channels located in a postsynaptic neuron's membrane, why are they so important with respect to how synapses pass along information?

		These channels allow specific neurotransmitters originating in the presynaptic neuron exert effects on the postsynaptic neuron.
		These channels are located specifically in the dendrites but not another part of the neuron, such as the axon.
		These channels open when a given amount of electrical signal in generated in the cell's membrane.
		These channels allow the neurotransmitter to enter and travel within the postsynaptic neuron.

25. When the receptor of a sensory neuron is activated and a nerve impulse is generated, the first step in the overall process would be ____________________________.

		the potassium channels to open
		the hyperpolarization of the membrane
		the repolarization of the membrane
		the depolarization of the membrane

periwinklecoyote319

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

amaranthmouse537

Which of the following statements is FALSE? (choose one)

A.	Voltage-gated sodium (Na+) channels open in the dendrites and cell body during a local, graded potential.

B.	During repolarization, potassium ions are leaving the cell (K+ is diffusing out of the cell), and the inside of the cell becomes more negative

C.	If someone damaged an efferent motor neuron, they could feel pain, but not respond to move away from the pain

D.	Myelin serves as electrical insulation and increases the speed at which an action potential travels along the axon

E.	Movement of ions can be excitatory (if sodium ligand-gated channels bind the neurotransmitter), or inhibitory (if potassium ligand-gated channels bind the neurotransmitter)

BIOM 2000 Lecture Notes - Perineurium, Axon Hillock, Sensory System

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