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How many of the following statements is/...

How many of the following statements is/are correct?
(i) Multipolar neurons have a single axon and multiple dendrites
(ii) Unipolar neurons have a cell body with one axon only .
(iii) The myelinated nerve fibres are enveloped with Schwann cells.
(iv) The postsynaptic neurons are filled with neurotransmitter containing vesicles.

A

One

B

Two

C

Three

D

None

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many of the given statements about neurons are correct, we will analyze each statement one by one. ### Step 1: Analyze Statement (i) **Statement (i):** Multipolar neurons have a single axon and multiple dendrites. - **Analysis:** This statement is correct. Multipolar neurons are characterized by having one axon and multiple dendrites, which allows them to receive signals from multiple sources. **Hint:** Remember the structure of multipolar neurons; they are the most common type of neurons in the nervous system. ### Step 2: Analyze Statement (ii) **Statement (ii):** Unipolar neurons have a cell body with one axon only. - **Analysis:** This statement is also correct. Unipolar neurons have a single process that extends from the cell body, which functions as an axon. **Hint:** Think about the structure of unipolar neurons; they typically have a single projection that serves as an axon. ### Step 3: Analyze Statement (iii) **Statement (iii):** The myelinated nerve fibers are enveloped with Schwann cells. - **Analysis:** This statement is correct. Schwann cells are responsible for the formation of the myelin sheath around myelinated nerve fibers in the peripheral nervous system. **Hint:** Recall the role of Schwann cells in myelination; they wrap around the axon to form the myelin sheath. ### Step 4: Analyze Statement (iv) **Statement (iv):** The postsynaptic neurons are filled with neurotransmitter containing vesicles. - **Analysis:** This statement is incorrect. Neurotransmitter-containing vesicles are found in presynaptic neurons, not postsynaptic neurons. Postsynaptic neurons have receptors that bind to neurotransmitters released from presynaptic neurons. **Hint:** Distinguish between presynaptic and postsynaptic neurons; presynaptic neurons release neurotransmitters, while postsynaptic neurons receive them. ### Conclusion After analyzing all four statements: - Statement (i): Correct - Statement (ii): Correct - Statement (iii): Correct - Statement (iv): Incorrect Thus, the number of correct statements is **3**. ### Final Answer The number of correct statements is **3**.
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