In a neuron, Nissls granules are found in the cytoplasm of the cell body.These granules are composed of
Correct answer: D. Free ribosomes and rough endoplasmic reticulum
- A. Free ribosomes, mitochondria, and lysosomes
- B. Mitochondria, peroxisomes, and Golgi bodies
- C. Lysosomes, peroxisomes, and rough endoplasmic reticulum
- D. Free ribosomes and rough endoplasmic reticulum
Explanation
Nissl granules, also known as Nissl bodies, are found in the cytoplasm of a neuron's cell body and are primarily composed of ribosomes and rough endoplasmic reticulum. These granules are involved in protein synthesis, which is crucial for neuron function. The correct option (D) includes free ribosomes and rough endoplasmic reticulum, which are key components of Nissl granules. Golgi bodies are present in the neuron cell body but are not components of Nissl granules. The other options include organelles such as mitochondria, lysosomes, and peroxisomes, which are not part of Nissl granules.
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About Neurons and Nerve Impulse
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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