Question

3. Given alongside is a partial diagrammatic
representation of a certain phenomenon
pertaining to the nervous system.
(i) Name the parts numbered 1-7
(ii) Name the phenomenon that the diagram
depicts and define it.
(iii) Give the technical term for the point of
contact between two nerve cells.
(iv) Name the parts
not shown in
the diagram
that should be
included to
complete the
pathway of the
phenomenon.
​

Answer 1

(1). part no. 1.Sensory (Afferent neuron)

(2).The phenomenon that is depicted here is the reflex action which is an involuntary and instant movement in response to stimuli.

(3).The term for the point of contact between the two nerve cells is called the synapse.

(4).(1). Sensory (Afferent neuron) (2). Dorsal ganglion (3). White matter(4). Grey matter

Answer 2

Answer:

3.i. The parts (1)-(7) are:-

1-white matter

2- Spinal chord

3-Dorsal root

4- Nucleus

5- Ventral root

6-central canal

7-Gray matter

ii.The phenomenon shown is reflex action.

There are certain body response which are immidate and do not required any pressing by brain. These action under controlled by spinal chord. These are called reflex action.

iii. Synapse

iv.a.Sensory

b. Dorsal ganglion

c. white matter

d. Gray matter