Which of the following is the longest cell in our body?

Correct option is A

The correct answer is (a) Nerve Cell.

• The longest cell in the human body is the nerve cell (neuron). Neurons are specialized cells responsible for transmitting electrical and chemical signals throughout the body.
• Their long extensions, called axons, can measure up to 1 meter (100 cm) long, especially in the sciatic nerve, which runs from the lower spinal cord to the toes.

Information Booster:

• Structure of a Neuron:
• Cell body (Soma): Contains the nucleus and controls cell activities.
• Dendrites: Receive signals from other neurons.
• Axon: Transmits signals over long distances.
• Axon terminals: Pass signals to the next neuron or muscle.
• Function of Nerve Cells:
• Carry messages between the brain, spinal cord, and body parts.
• Control reflexes, voluntary actions, and sensory inputs.
• Longest Nerve in the Body:
• The sciatic nerve is the longest nerve, composed of multiple neurons, and runs from the lower back to the foot.

Additional Knowledge:

Ovum (Egg Cell)

o   The human ovum (egg cell) is the largest cell in the body but not the longest.

o   It has a diameter of 0.1 mm (100 micrometers), making it visible to the naked eye.

Blood Cell

o   Red Blood Cells (RBCs) are among the smallest cells in the body, measuring about 7-8 micrometers in diameter.

o   They lack a nucleus and help transport oxygen.

Fat Cell

o   Fat cells (adipocytes) are large but not the longest. They store energy in the form of fat and help in insulation and cushioning.