16.1 & 16.2 - Neurvous system

Optic nerves and auditory nerves belong to the central nervous system.

• True

• False

If myelin sheath is severely damaged, we may lose the ability to control our muscles.

• True

• False

Which of the following is the basic structural unit of the nervous system?

• nucleus

• neurone

• nerve

• brain

Which part of the neuron receives signals from other neurons or sensory receptors?

• Axon

• Dendrite

• Receptor

• Myelin sheath

Which of the following combinations correctly identifies the structures that belong to the central nervous system and those belong to the peripheral nervous system?

(Central nervous system; Peripheral nervous system)

• CNS: P and Q;

  PNS: R and S

• CNS: P and R;

  PNS: Q and S

• CNS: Q and R;

  PNS: P and S

• CNS: Q and S;

  PNS: P and R

What is neurone X?

• motor neurone

• sensory neurone

• interneurone

• moving neurone

Which of the following comparisons between these two types of neurones is correct?

• X: dendrons connected to receptors
  
  Y: dendrons connected to other neurones

• X: axons connected to other neurones

  Y: axons connected to effectors

• X: transmits nerve impulses to the CNS

  Y: transmits nerve impulses away from the CNS

• X: cell body located inside the CNS

  Y: cell body located outside the CNS

Which of the following statements about myelin sheath are true?

(1) It is rich in lipid.

(2) It speeds up the transmission of nerve impulses.

(3) It insulates nerve fibres.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)