Question 2(b)(i)
[Maximum number: 1]
The nervous system coordinates the responses of animals to changes in their environment.
Fig. 2.2 is a flow chart that shows how an involuntary action is controlled.
Fig. 2.2
State the structure found at X.
IGCSE Biology Extended 14.1.5—Simple reflex arc in terms Topic Practice
14.1.5—Simple reflex arc in terms
• Describe a simple reflex arc in terms of: receptor, sensory neurone, relay neurone, motor neurone and effector
Question 2(a)
[Maximum number: 1]
Reflexes are simple responses that protect the body. The pathway that nerve impulses travel along during a reflex is called a reflex arc.
Letters A to G show the components of a reflex arc.
A stimulus
B motor neurone
C sensory neurone
D receptor cell E response F relay neurone G effector Put the components into the correct sequence. Two have been done for you.
Question 3(a)
[Maximum number: 1]
Reflexes are simple responses that protect the body.
The letters A to G show the components involved in a reflex action.
A stimulus
B motor neurone
C sensory neurone
D receptor cell E response F relay neurone G effector Put the letters into the correct sequence involved in a reflex action. Two have been done for you.
Question 21
[Maximum number: 1]
Which of the following can be an effector in a reflex arc?
A
a gland
B
a light receptor
C
the brain
D
the spinal cord
Question 23
[Maximum number: 1]
The steps to produce a reflex action where the hand is withdrawn from a hot object are shown.
1 Nerve impulses pass from the sensory neurone to the relay neurone.
2 Nerve impulses pass from motor neurone to the effector.
3 Nerve impulses pass from the receptor to the neurone.
What is the correct sequence of steps?
A
B
C
D
Question 23
[Maximum number: 1]
The diagram shows the structures in a reflex arc.
What is X ?
A
effector
B
relay neurone
C
sensory neurone
D
synapse
Question 23
[Maximum number: 1]
What is the correct sequence in a reflex action?
A
receptor → stimulus → motor neurone → relay neurone → sensory neurone → effector
B
receptor → stimulus → sensory neurone → relay neurone → motor neurone → effector
C
stimulus → receptor → motor neurone → relay neurone → sensory neurone → effector
D
stimulus → receptor → sensory neurone → relay neurone → motor neurone → effector
Question 23
[Maximum number: 1]
Which is the correct sequence of structures through which a nerve impulse passes in a reflex arc?
A
effector → motor neurone → relay neurone → sensory neurone → receptor
B
effector → sensory neurone → relay neurone → motor neurone → receptor
C
receptor → motor neurone → relay neurone → sensory neurone → effector
D
receptor → sensory neurone → relay neurone → motor neurone → effector
Question 23
[Maximum number: 1]
The diagram shows a reflex arc.
Which structure is the sensory neurone?
Question 24
[Maximum number: 1]
The diagram represents a simple reflex arc.
What is the sequence of nerve cells through which an impulse passes during a reflex action?
first
last
P
Q
R
Q
R
P
Q
P
R
R
P
Q