Redraw the diagram. Name and label the parts indicated, below, Secretes neurotransmitter

The neuron can be characterised as the structural and functional unit of the nervous system. It is composed of dendrons, soma, axon hillock, axon, and synaptic knobs. Neurotransmitters carry the neural or electrical signal across the synapse to other neurons. Synaptic knobs secrete the neurotransmitter.

Observe the picture and answer the following question How does myelin sheath form ?

The myelin covering is known as the myelin sheath and is broken up at points called the nodes of Ranvier. This structure plays an essential role in increasing the speed of the transmission of the signal. Some axons are covered with myelin which is a lipid substance and acts as an insulator. Myelin sheath is formed due to the repeated encircling of Schwann cells around the axon.

Redraw the diagram. Name and label the parts indicated, below, Branches of dendrons

The neuron can be characterised as the structural and functional unit of the nervous system. It is composed of dendrons, soma, axon hillock, axon, and synaptic knobs. Dendrites can be characterised as tree-like extensions found to be present at the beginning of the neuron. These structures receive information from other neurons and transmit electrical stimulation to the soma or the cell body of the neuron.

MEDIUM

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What is the function of dendrites?

Important Questions on Control and Coordination

HARD

Science>Biology>Control and Coordination>Human Nervous System

Describe the structure of a Neuron with the help of labelled diagram.

EASY

Science>Biology>Control and Coordination>Human Nervous System

"Myelin sheath accelerates the speed of impulses through axon and provides nutrition to it."

How does myelin sheath form?

EASY

Science>Biology>Control and Coordination>Human Nervous System

Stimulus from the environment is detected by the nerve cells. The stimulus acquired is transmitted in the form of electrical impulses. From the options given below choose the correct scheme showing the direction in which the nerve impulse travels. (Arrows shows the direction of impulse flow)

MEDIUM

Science>Biology>Control and Coordination>Human Nervous System

How do nerve impulses travel in the body ? Explain.

MEDIUM

Science>Biology>Control and Coordination>Human Nervous System

How does nerve impulse travel in our body?

EASY

Science>Biology>Control and Coordination>Human Nervous System

Redraw the diagram. Name and label the parts indicated, below,

Question Image

Secretes neurotransmitter

EASY

Science>Biology>Control and Coordination>Human Nervous System

Observe the picture and answer the following question

Question Image

How does myelin sheath form ?

EASY

Science>Biology>Control and Coordination>Human Nervous System

Redraw the diagram. Name and label the parts indicated, below,

Question Image

Branches of dendrons

MEDIUM

Science>Biology>Control and Coordination>Human Nervous System

Write any two differences between axon and dendrites.

MEDIUM

Science>Biology>Control and Coordination>Human Nervous System

Write a and b in the given flow chart of neuron through which information travels as an electrical impulse.

Question Image

HARD

Science>Biology>Control and Coordination>Human Nervous System

A neuron consists of (1), (2) and (3). The (1) contains most of the cell organelles except (4). The (2) conduct nerve impulses to the (1). (3) vary in length and can measure anything from a few mm to a meter. Most neurons are surrounded by a white insulating sheath called (5). Between the segments of (5) are gaps called the (6). The (3) has a swollen end called bulb that stores a chemical called (7).

MEDIUM

Science>Biology>Control and Coordination>Human Nervous System

The human body contains many cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells, through which electric impulses can pass by the release of a chemical substance.

What is the name of (i) branch B, and (ii) branches C?

EASY

Science>Biology>Control and Coordination>Human Nervous System

Explain the function of cell body of a neuron.

EASY

Science>Biology>Control and Coordination>Human Nervous System

Node of Ranvier occurs where

HARD

Science>Biology>Control and Coordination>Human Nervous System

Differentiate between medullated and non-medullated fibre.

EASY

Science>Biology>Control and Coordination>Human Nervous System

Explain the different parts of a neuron.