Ap Biology Nervous System Questions

they speed up significantly in areas through more myelin wrapping, depending on the thickness of the sheath


Explanation:

The tiny gaps in in between myelin sheaths are referred to as nodes of Ranvier. The activity potential will jump from node to node as it moves down the axon.

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If an axon existed without these gaps (the entire size was spanned in myelin), it would certainly be unable to conduct an action potential.


Which percentage of a neuron receives neurotransmitters from a previous neuron, signaling the require for propagation of action potential?


Explanation:

Neurotransmitters from presynaptic cells are obtained by the dendrites of postsynaptic cells. Tright here are myriad dendrites on each neuron that then propagate this signal to the soma (or cell body), permitting the signal to be passed down the axon to another neuron.


Explanation:

The axon carries activity potentials amethod from the cell body of a neuron by means of a sequence of consistent depolarization. The cell body, or soma, but, is the website of neurotransmitter production and the area of the nucleus and other organelles. Eexceptionally single neuron includes just one axon.


Schwann cells create myelin for neurons of the peripheral nervous system, while oligodendrocytes create myelin for neurons of the central nervous mechanism.


Explanation:

A neuron receives input from various other neurons at the dendrites. Neurotransmitters released by other neurons bind to receptors on the dendrites, which bring the signal to the cell body. The signal is then magnified in the cell body before being moved to the axon. Once the signal transitions to the axon, it is taken into consideration an action potential. The signal ultimately reaches the end of the axon, wbelow the synaptic vesicles are situated, and also stimulates release of neurotransmitters to the following neuron"s dendrites.


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Example Concern #6 : Nervous System


Which of the following is true about a neuron?


Possible Answers:

The propagation of signal with a neuron initiates at the dendrite, enters the cell body, and also is transmitted from the axon


If an electrical disturbance is large sufficient in the cell body, the signal geneprices an action potential at the dendrite


Neurons contain multiple dendrites and also cell bodies


Neurons transmit electrical signals from one cell to the other at the cell body


Correct answer:

The propagation of signal with a neuron initiates at the dendrite, enters the cell body, and is transmitted from the axon


Explanation:

Neurons have actually many dendrites, one cell body, and also a single axon through several terminal branches. A dendrite receives an outside stimulus and causes an electrical disturbance in the cell body. This electric disturbance is transmitted to the axon, where an activity potential is generated if the stimulus is large enough. The action potential is propagated with the axon and also is transmitted to a bordering neuron at the synapse.

A large sufficient electrical disturbance will geneprice an action potential in the axon, but no magnitude of stimulus deserve to create an activity potential in the dendrites. Neurons perform contain multiple dendrites, however they only contain one cell body and also one axon. Finally, neurons transmit electric signals to other neurons at the synapse, not at the cell body.


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Example Question #1 : Understanding Neurons


An electrical synapse supplies __________ to transmit electric signals between neurons.

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Possible Answers:

anchoring junctions


desmosomes


gap junctions


tight junctions


Correct answer:

gap junctions


Explanation:

Tright here are 2 types of synapses: chemical and electrical. Chemical synapses usage chemical signals referred to as neurotransmitters to transmit nerve signals in between neurons, whereas electric synapses use electrical signals. These electrical signals are transmitted via a gap junction that connects surrounding neurons. Intercalated discs in cardiac muscle contain gap junctions for the objective of propagating electrical signals to reason systole.


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Example Question #8 : Nervous System


Which of the adhering to cells is discovered in the peripheral nervous system?


Possible Answers:

Microglia


Ependymal cells


Oligodendrocytes


Astrocytes


Schwann cells


Correct answer:

Schwann cells


Explanation:

While both oligodendrocytes and also Schwann cells produce myelin sheaths that insulate nervous mechanism signals, just the Schwann cells are found in the peripheral nervous device.

All other cells detailed are discovered only in the main nervous mechanism. Microglia act as immune cells within the cerebrospinal fluid, since lymphocytes are barred entry by the blood-brain obstacle. Astrocytes support the neural cells and administer nutrients. Ependymal cells are responsible for secreting cerebrospinal fluid.


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Example Concern #1 : Nervous System


Which of the complying with cells are responsible for increasing the activity potentials along the axon of a neuron?


Possible Answers:

Glial cells


Myocytes


Ependymal cells


Schwann cells


Astrocytes


Correct answer:

Schwann cells


Explanation:

The correct answer is Schwann cells. Schwann cells are cells that develop the myelicountry present on the outer spanning of the axon of the neuron. This lipid-affluent product helps facilitate the motion of the activity potential along the axon from the axon hillock to the axon terminal branches.


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Example Concern #1 : Nervous System


The sensible devices of the nervous device are __________.


Possible Answers:

nephrons


neurotransmitters


gray matter

 


neurons


Correct answer:

neurons


Explanation:

Neurons are the practical unit of the nervous device. Dendrites of the neuron accept incoming activity potentials and also stimuli, and propagate the signal dvery own the cell axon to stimulate various other adjacent neurons.

Nephrons are the sensible unit of the kidney. Gray matter refers to the areas in the central nervous device wbelow the axonal cell bodies are situated, while white issue refers to the regions that contain axons. Neurotransmitters are the particles offered to transmit signals across synapses from one neuron to an additional.


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