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, 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.

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.

EASY

Earn 100

Node of Ranvier occurs where

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Important Questions on Neural Control and Coordination

MEDIUM

Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

Receptor sites for neurotransmitters are present on

EASY

Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

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

How does myelin sheath form?

EASY

Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

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)

EASY

Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

Assertion ( $A$ ): In myelinated nerve fibres, action potentials are conducted at a faster rate.

Reason ( $R$ ): The myelin present between nodes of Ranvier has concentrated $Na$ and $K$ voltage-gated channels.

MEDIUM

Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

How does nerve impulse travel in our body?

EASY

Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse

The transport of which neutrotransmitter is interfered by cocaine?

EASY

Biology>Human Physiology>Neural Control and Coordination>Generation and Conduction of Nerve Impulse