SME
Grade 9 Science
The nervous system and the senses
The main lesson, then each kind of problem it solves.
The nervous system and the senses
Main lesson
How fast a nerve impulse travels
Use this for “An impulse travels 1 m from the toe to the spinal cord at 50 m/s. How long does it take?”
A nerve impulse
Use this for “What makes the inside of a neuron positive during an impulse?”
Membrane potential through an impulse
Use this to record a neuron’s membrane potential through one impulse.
Across a synapse
Use this for “How does a signal pass from one neuron to the next?”
Which part of the nervous system?
Use this for “Which part of the nervous system speeds up the heart in an emergency?”
Which receptor detects it?
Use this for “Which receptors in the eye respond to light?”