Correct Option: B. Dendrite Detailed Explanation: Neurons are specialized cells in the nervous system that transmit information throughout the body. They consist of several key parts, each with distinct functions. The primary components of a neuron include:

1. Dendrites: These are tree-like structures that extend from the neuron’s cell body (soma). Dendrites are primarily responsible for receiving signals from other neurons or sensory cells. They contain numerous receptors that bind neurotransmitters released from neighboring neurons, allowing the neuron to receive and process incoming information.
2. Soma (Cell Body): The soma contains the nucleus and organelles of the neuron. While it plays a crucial role in maintaining the cell's health and integrating signals received from the dendrites, it is not primarily responsible for receiving signals.
3. Axon: The axon is a long, slender projection that transmits electrical impulses away from the cell body to other neurons or muscles. It is responsible for sending signals rather than receiving them.
4. Myelin Sheath: This is a fatty layer that surrounds the axon in many neurons, acting as an insulator to speed up the transmission of electrical signals. The myelin sheath does not play a role in receiving signals.

Why the Other Options Are Wrong:

• A. Axon: The axon is responsible for transmitting signals away from the neuron, not receiving them. It conducts action potentials to communicate with other neurons or target cells.
• C. Soma: While the soma integrates signals received from dendrites, it does not directly receive signals. Its primary function is to maintain the cell's metabolic activities and process incoming information.
• D. Myelin sheath: The myelin sheath serves to insulate the axon and enhance the speed of signal transmission. It does not have any role in receiving signals from other neurons or sensory cells.

Summary of Key Points:

• Dendrites are the parts of the neuron that receive signals from other neurons or sensory cells.
• The soma integrates these signals but does not receive them directly.
• The axon transmits signals away from the neuron, while the myelin sheath insulates the axon to speed up signal transmission.
• Understanding the functions of each part of the neuron is crucial for grasping how information is processed in the nervous system.

Revision Summary:

• Dendrites are responsible for receiving signals from other neurons or sensory cells.
• The soma integrates signals but does not receive them directly.
• Axons transmit signals away from the neuron.
• Myelin sheaths insulate axons to enhance signal transmission speed.