BIOL 115 Lecture Notes - Lecture 21: Episodic Memory, Synaptic Plasticity, Basal Ganglia

25 views8 pages

jadebat19

23 Nov 2017

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

The advantage of myelin is that it helps o improve the efficiency of the action potentials. Instead of having to open every voltage gated channel along the axon, it can cluster at the nodes of ranvier. If a neuron does not fire action potentials, this might be because these neurons do not have voltage- gated sodium channels and no voltage-gated potassium channels. The sodium gets the action potential moving, so if (cid:455)ou do(cid:374)(cid:859)t ha(cid:448)e sodiu(cid:373), (cid:455)ou (cid:272)a(cid:374)(cid:859)t ha(cid:448)e a(cid:374) a(cid:272)tio(cid:374) potential. The potassium brings the potential back down after the action potential. If (cid:455)ou (cid:272)a(cid:374)(cid:859)t (cid:271)ri(cid:374)g the pote(cid:374)tial (cid:271)a(cid:272)k do(cid:449)(cid:374), (cid:455)ou (cid:272)a(cid:374)(cid:374)ot ha(cid:448)e a(cid:374)(cid:455) (cid:373)ore a(cid:272)tio(cid:374) pote(cid:374)tials. Myelin helps the action potential move faster along the axon must is not necessary for action potentials to happen. An effect that a neurotransmitter could have that would result in inhibition would be opening channels to let chloride in.

Related Questions

1.A stronger stimulus to a neuron results in ________.

A. larger voltage changes in graded potentials and greater frequency of action potentials produced in response

B. greater frequency of graded potentials and larger voltage changes in the action potentials produced in response

C. larger voltage changes in the graded potentials, but no changes in action potentials

D. larger voltage changes in both graded and action potentials

E. larger voltage changes in graded potentials but smaller action potentials

2. Why is it more difficult to fire an action potential when the interval between stimuli decreases?

A. because sodium is flowing out of the cell

B. because potassium is flowing into the cell

C. because some sodium channels may still be in an inactivated state

D. because chloride is flowing into the cell

E. because chloride is flowing out of the cell

3. As an action potential zips down an axon,

A. voltage gated potassium channels open first followed by voltage-dependent sodium channels

B. voltage- gated sodium channels ahead of the wave and not yet activated are influenced by the depolarizing electrical field of other nearby sodium channels

C. voltage-gated potassium channels ahead of the wave and not yet activated are influenced by the depolarizing electrical field of nearby sodium channels

D. leak channels are opened by the wave of electricity passing along the axon

E. B and C

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)

BIOL 115 Lecture Notes - Lecture 21: Episodic Memory, Synaptic Plasticity, Basal Ganglia

Document Summary

Get access

Related Documents

BIOL 115 Lecture Notes - Lecture 19: Wide Open Space, Action Potential, Myelin

BIOL 115 Lecture Notes - Lecture 17: Cochlea, Retina, Positron Emission Tomography

BIOL 115 Study Guide - Final Guide: Immediate Early Gene, Allele Frequency, Genetic Drift

Related Questions