Selina solutions

Selina solutions

Grade 7

Nervous System | Long Answer Questions (LA)

Question 1

Q1) With the help of a suitable diagram describe the structure of a neuron.

Solution:

Neurons, also called Nerve cells, are responsible for transmitting information in the form of electrical and chemical signals.

Neurons are the core component of the brain Spinal cord and the central nervous system and the ganglia of the peripheral nervous system.

The human brain has approximately 100 billion neurons.

A typical neuron has all the parts that any cell would have, and a few specialized structures that set it apart.

Soma/Cell body: The main portion of the cell is called the soma or cell body. It contains the nucleus, that contains the genetic material in the form of chromosomes.

Dendrites: Neurons have a large number of extensions called dendrites. They often look like branches or spikes extending out from the cell body. The surfaces of the dendrites receive chemical messages from other neurons.

Axons: Usually a long process which often projects to distant regions of the nervous system. The axon is the main conducting unit of the neuron, capable of conveying electrical signals along distances that range from as short as 0.1 mm to as long as 2 m. Many neurons do not have axons.

Synaptic Terminals: This is where axons end, contain vesicles with neurotransmitters. They are also separated from the next neuron by a gap(synapse).

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subject-cta

Question 1

Q1) With the help of a suitable diagram describe the structure of a neuron.

Solution:

Neurons, also called Nerve cells, are responsible for transmitting information in the form of electrical and chemical signals.

Neurons are the core component of the brain Spinal cord and the central nervous system and the ganglia of the peripheral nervous system.

The human brain has approximately 100 billion neurons.

A typical neuron has all the parts that any cell would have, and a few specialized structures that set it apart.

Soma/Cell body: The main portion of the cell is called the soma or cell body. It contains the nucleus, that contains the genetic material in the form of chromosomes.

Dendrites: Neurons have a large number of extensions called dendrites. They often look like branches or spikes extending out from the cell body. The surfaces of the dendrites receive chemical messages from other neurons.

Axons: Usually a long process which often projects to distant regions of the nervous system. The axon is the main conducting unit of the neuron, capable of conveying electrical signals along distances that range from as short as 0.1 mm to as long as 2 m. Many neurons do not have axons.

Synaptic Terminals: This is where axons end, contain vesicles with neurotransmitters. They are also separated from the next neuron by a gap(synapse).

Still have questions? Our expert teachers can help you out

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subject-cta
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