The document summarizes Chapter 12 of Biology on coordination and response. It describes a reflex arc and the steps involved, including sensory receptors that receive stimuli and send nerve impulses to the spinal cord via afferent neurons. Interneurons in the spinal cord then activate efferent neurons that trigger muscles to contract and remove the body from the stimulus. It also lists parts of the reflex arc labeled J through N.

1. INTERVENTION – BIOLOGY CHAPTER 12
CHAPTER 12 : COORDINATION AND RESPONSE
1. The figure below shows a reflex arc.
(a) Fill in the blanks.
Step Description of a reflex action
1 The sharp needle that pokes the finger act as a ……………………….
2 The sensory ………………….. for pain at the skin receives the stimulus.
3 The sensory receptor produces ……………….. impulse.
4 The impulse is sent by the ………………… neuron to the spinal cord.
5 The afferent neuron will synapse with the …………………… found in the
…………….. matter of the spinal cord.
6 The interneuron will form a synapse with the ………………… neuron.
7 The efferent neuron will bring the nerve impulse to the ………………… which
consists of muscles.
8 The muscles will ……………… and pull the hand away from the stimulus.
(b) Name the structure labelled J – N.
Label Name
JKLMN
needle
N
J
L
K
M

2. INTERVENTION – BIOLOGY CHAPTER 12
Corrective mechanism
Corrective mechanism
Pancreas
secretes
glucagon
Normal glucose level
glucose level
rises
glucose level
falls
glucose
level is
lowered
glucose
level
rises
Normal glucose level