Question
A boy accidentally touches a very hot object and immediately takes his hand away.
In this reflex action, what is the effector?
A a heat receptor in his hand
B a motor neurone
C a muscle in his arm
D the spinal cord
Answer/Explanation
Ans
C
Question
The diagram shows a synapse.
Where are vesicles containing neurotransmitter molecules found?
Answer/Explanation
Ans: B
Question
Which numbered parts form the central nervous system?
A 1 only B 1 and 2 C 2 and 3 D 3 only
Answer/Explanation
Ans
B
Question
Four processes occur when impulses cross a synapse.
P neurotransmitter diffuses across the gap
Q neurotransmitter binds with receptors
R impulse stimulates vesicles
S release of neurotransmitter
What is the correct sequence for these processes?
A P → R → Q → S
B R → P → Q → S
C R → S → P → Q
D S → Q → R → P
Answer/Explanation
Ans: C