1.2 Answers Week 2
1. a)Brain and the Spinal Cord.
b) The Peripheral Nerve System (PNS)
c) ‘sending’ neuron
d) Synapse
e) reflex arc
Type of Neuron
Function
Structure
Sensory
Carry nerve impulses
from sense organs to
central nervous system
5 sense organ
interneuron
A nerve cell found
entirely within the
central nervous system
that acts as a link
between sensory
neurons and motor
neurons.
Connector
Motor neuron
A nerve cell forming
Long axon
part of a pathway along
which impulses pass
from the brain or spinal
cord to a muscle or
gland.
3. The nerve system is needed for animals because it helps them feel
pain, then once they feel the pain it stimulates and signals the body that
they need to run away from the cause of pain.
4. Because of the dendrite changing from a electrical message to a
chemical message.
5. a) The receptor is within the skin and produces a nerve system; the
effector is where nerve signals arrive.
b) motor neurons are the nerves that send signals to your muscles telling
them what to do
interneurons are the nerves that connect the sensory and motor neurons
for example, you see a bear growling at you: the sensory neurons relay
message to brain which i imagine uses the interneurons to relay message
within the brain itself,
motor neurons tell the legs to run.
c) A neuron (or neurone) is an individual cell of the nervous system.
A whitish fiber or bundle of fibers that transmits impulses of sensation
to the brain or spinal cord.
d) A reflex action is where you aren’t conscious and a conscious response
is where you are conscious.
7. It is covered to protect the myelin sheath.
8. Sneezing and shivering because you cant control it.
9. a) you sneeze
b) hurt/scream
10. a)The patellar reflex or knee-jerk is a deep tendon reflex and is a
myotatic reflex.
b) because it triggers the knee to jerk.
11. Bacause your eye needs to pick up as much as it can as it is very dark.