Question

Q. Consider the following statements with reference to Nerves:

Which of the above given statements is/are correct?

• A.
  1 and 2 only
• B.
  1 and 3 only
• C.
  1 only
• D.
  1, 2 and 3

Answer 1

The correct option is A

1 and 2 only
Explanation:

Statement 1 is correct: Nerves are thread-like structures which emerge from the brain and backbone. It is responsible for conveying signals to all body parts. Three forms of nerves also exist. Any of these neurons can fire signals at speeds greater than 119 m / s or greater than 428 km / h.

• Sensory nerves send messages from all the senses to the brain.
• Motor nerves carry messages from the brain to all the muscles.
• Mixed nerves carry both sensory and motor nerves.

Statement 2 is correct: Cranial nerves originate from the brain, as they bring impulses from the central nervous system. Some cranial nerves belong to the mixed-nerves group.

Statement 3 is incorrect: There are both sensory and motor nerves .Certain cranial nerves belong to the group of mixed nerves. That is they function both as sensory and motor nerves.