Available Answers

1. 1.

   Tick the most appropriate answer.

   1. Many short fibres extending from the cell body of a nerve cell are called
      1. dendrons
      2. axon
      3. dendrites
      4. ganglia
   2. Motor nerve carries messages to the
      1. heart
      2. spinal cord
      3. muscles and glands
      4. brain
   3. These nerves emerge from the brain and reach organs in the head region.
      1. spinal
      2. cranial
      3. vagus
      4. pelvic
   4. The message that travels along a nerve in the form of a wave of chemical disturbance is called
      1. stimulus
      2. response
      3. sensation
      4. impulse
   5. Junction of the two neurons is called
      1. joint
      2. synapse
      3. association neuron
      4. synaptic button
   6. The human brain is enveloped by three membranes called
      1. impulses
      2. meninges
      3. synapses
      4. none of these
   7. Breathing and heartbeat are controlled by the
      1. cerebellum
      2. cerebrum
      3. medulla
      4. nerve cells
   8. The central canal of the spinal cord is surrounded by an H-shaped area called
      1. grey matter
      2. white matter
      3. black matter
   9. Reflex actions are the actions controlled by
      1. brain
      2. spinal cord
      3. both brain and spinal cord
      4. neither brain nor spinal cord
   10. The peripheral nervous system transmits messages to and from the sense organs and is responsible for
       1. involuntary actions
       2. reflex actions
       3. autonomic actions
       4. voluntary actions
2. 2.

   Fill in the blanks.

   1. A neuron is the basic structural and functional unit of the ________________ system.
   2. A single long fibre extending from the cell body of a neuron is called _______________.
   3. The central nervous system consists of ______________ and _______________.
   4. The __________________ is the continuation of the medulla oblongota of the brain.
   5. The nerve pathway of a reflex action is called a _____________.
   6. The peripheral nervous system consists of ___________________ and _______________ nerves.
3. 3.

   Write true or false. Correct the false statements.

   1. Each nerve cell consists of a cell body, many short fibres and a long fibre.
   2. Motor nerves carry impulses from the sense organs to the spinal cord.
   3. The largest portion of the brain is the cerebellum.
   4. Thinking, reasoning and memory are controlled by the medulla.
   5. A reflex action is a spontaneous response to a stimulus.
   6. The central nervous system consists of nerves only.
4. 4.

   Differentiate between Sensory nerves and Mixed nerves.

5. 5.

   Differentiate between Cranial nerves and Spinal nerves.

6. 6.

   Differentiate between Sensory nerves and Motor nerves.