Judge the nerve fibre claims

Exercise and reference answers

Questions

1. Reason

   Myelinated fibres are enveloped by Schwann cells forming a myelin sheath.

   Verdict

   Both are true; the reason does not explain the assertion.

   Assertion

   Myelinated nerve fibres are found in spinal and cranial nerves.

2. Reason

   Nodes of Ranvier are the gaps between two adjacent myelin sheaths.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Nodes of Ranvier lie along a myelinated axon.

3. Reason

   A bipolar neuron carries one axon and one dendrite.

   Verdict

   The assertion is false and the reason is true.

   Assertion

   Bipolar neurons are found in the cerebral cortex.

4. Reason

   That Schwann cell forms a thick myelin sheath around the axon.

   Verdict

   The assertion is true and the reason is false.

   Assertion

   An unmyelinated fibre still has a Schwann cell around it.

Instructions

Read A and R, then tap the verdict that fits both.

Explanation