Transmission of Impulse

Q1: What are the three main events involved in the transmission of nerve impulses in a neuron?

Answer: 

The three main events involved in the transmission of nerve impulses in a neuron are a generation of nerve impulses, propagation of nerve impulses, and synaptic transmission.

Q2: How does the presence of myelin sheath in a neuron contribute to faster transmission of nerve impulses?

Answer: 

The myelin sheath insulates the axon of a neuron, allowing the nerve impulse to jump from one node of Ranvier to another in a process called saltatory conduction. This speeds up the transmission process, making it faster and more efficient.

Q3: What is the role of neurotransmitters in synaptic transmission?

Answer: 

Neurotransmitters are chemical molecules that are released from the presynaptic neuron at the synapse. They diffuse across the synaptic cleft and bind to receptors on the postsynaptic neuron or target cell, generating a new action potential and continuing the transmission of the nerve impulse.

Q4: Explain the process of propagation of nerve impulses in a myelinated neuron.

Answer: 

In a myelinated neuron, the nerve impulse propagates by jumping from one node of Ranvier to another, due to the presence of myelin sheath. This process is called saltatory conduction, which speeds up the transmission process and conserves energy for the neuron.

Transmission of Nerve Impulses: The nervous system is responsible for controlling and coordinating the activities of different organs and systems in the body. The subtopic of “Transmission of Impulses” is an important part of the chapter “Neural Control and Coordination” in CBSE Class 11 Biology. 

A vital component in our nervous system is the transmission of impulses – how we communicate messages throughout the neural network. Action potentials, or electrical signals that travel between cells known as neurons facilitate this communication efficiently. This coordinated effort across multiple cells allows us to respond quickly and with precision no matter what triggers our response.