WorksheetsThe Reflex Arc
Total questions: 21
Worksheet time: 16mins
Name
Class
Date
1.
The part labelled 1 is white in colour what is it that gives this colour?
a)
Bone
b)
Fat (myelin)
c)
Tendons
d)
Membrane
2.
Salivary glands are an example of ...
a)
A receptor
b)
A relay
c)
A detector
d)
An effector
3.
What is the neuron found only in the spinal cord?
a)
Relay
b)
Sensory
c)
Motor
d)
Reflex
4.
What is the average time for a human to react to visual stimuli?
a)
0.25s
b)
0.80s
c)
0.10s
d)
0.95s
5.
What is the name of part 2?
a)
Dorsal root
b)
Dorsal root ganglion
c)
Root ganglion
d)
Cell body
6.
Which number shows the motor neuron?
a)
4
b)
5
c)
2
d)
1
7.
What neuron is this?
a)
Relay
b)
Motor
c)
Reflex
d)
Sensory
8.
Part 2 is the cell body, where is this found?
a)
In the dorsal root ganglion
b)
In the spinal cord
c)
In the skin
d)
In bone
9.
What neuron is this?
a)
motor
b)
sensory
c)
relay
d)
reflex
10.
What makes up the CNS
a)
brain and spinal cord
b)
brain and neurons
c)
brain
d)
spine and neurons
11.
What are the two systems found in the PNS?
a)
Somatic and autonomic
b)
Autonomic and systemic
c)
Automatic and somatic
d)
Systematic and automatic
12.
A reflex does not always go to the brain, what neuron allows the information to be take to the brain from a reflex?
a)
Relay
b)
Motor
c)
Sensory
d)
Reflex
13.
What is the role of the myelin on a neuron?
a)
Insulates
b)
Stimulates
c)
Relays
d)
Keeps warm
14.
What does the P in PNS stand for?
a)
Peretal
b)
Peripheral
c)
Poetal
d)
Prevalent
15.
What is the potential difference across a neurone in its resting state?
a)
+40 mV
b)
-40 mV
c)
+70 mV
d)
-70 mV
16.
When the neurone is stimulated what gated channels open?
a)
Na+
b)
K+
c)
Cl-
d)
Mg+
17.
The process of the neurone becoming positive is called
a)
polarisation
b)
depolarisation
c)
hyperpolarisation
18.
During the acting state of a neurone the potential difference across the membrane is ..
a)
+40 mV
b)
-40 mV
c)
+70 mV
d)
-70 mV
19.
The movement of the impulse down a neurone is due to an influx of Na+ ions. This is an example of what sort of feedback?
a)
Positive
b)
Negative
c)
Not an example of any feedback
20.
To stimulate a neurone there must be a certain level of stimulation from synapses, if not then the neurone will not send the impulse. This is known as the ...
a)
Maximum level
b)
Total level
c)
Threshold level
d)
Stimulating level
21.
Hydra do not have a nervous system containing a CNS or PNS, instead the have a ....
a)
Nerve net
b)
Nerve network
c)
No nerves
100 %
