The Nervous System
Task 1. Watch the nervous system animation at http://www.brainpop.com/health/bodysystems/nervoussystem/ login: asij password: mustangs then take the Graded Quiz and record your score here: ….. /10
Task 2. Find definitions for the following terms:
Somatic nervous system: the group of nerves belonging to the PNS that transmit messages away from the CNS to the voluntary (skeletal) muscles of the body
Autonomic nervous system: the part of the PNS that stimulates, through motor neurons
Motor (effector) neurons:
Sensory (affector) neurons:
Interneurons (relay):
Neurons
Task 1. Watch the nervous system animation at http://www.brainpop.com/health/bodysystems/neurons/ login: asij password: mustangs then take the Graded Quiz and record your score here: ….. /10
Task 2. Drag and Drop the following labels to the correct position around the diagram of a neuron
synaptic terminal of other neurons
direction of impulse
soma
myelin sheath
axon
dendrites
Task 3. Insert arrows to match the part of the neuron to its function
Axon | | Insulate axon for quicker impulse transmission |
Dendrite | | Receive stimulus from sense organ receptor or other neurone |
Myelin sheath | | Transmit impulse to another neurone or muscle/gland |
Soma (cell body) | | Keep the neurone alive and control function |
Reflex Arc
A reflex arc occurs when you touch or step on something sharp or hot. The information does not need to go to your brain. Instead, the interneurons in the spinal cord control the response.
Task 1. Rearrange the pictures and captions below to represent a simple reflex arc
sensory neuron
Motor neuron
Interneuron in the spinal cord
Skin receptors
Muscle fibres
Nerve impulse is transmitted
Message is relayed to motor neuron
Muscle pulls hand away
Finger touches a hot object
Nerve impulse is transmitted
Action...