Vocab
A change in the environment that causes a reaction
Stimulus
First to receive the message
Dendrites
You blink when something flies at your face.
Reflex
What is the pathway for a reflex?
stimulus>sensory neurons>spinal cord>motor neurons>response
What are the 2 parts of the nervous system?
CNS and PNS
Is sent to the muscles from the CNS
Motor Neurons
Speeds up the signal and is a fatty substance that wraps around the axon
Myelin Sheath
You decide to answer a question in class.
Conscious
What is the signal pathway for a conscious response?
stimulus>sensory neurons>brain>motor neurons>response
What are the main parts of the CNS?
Brain and spinal cord
These responses are involuntary
Sends signal to the next cell
Axon terminal
You pull your hand away from a hot stove.
Reflex
A student steps on a tack while walking barefoot.
steps on tack>sensory neurons(foot)>spinal cord>motor neurons(hands/knee/mouth)>grabs foot/bends knee/yells
What are the main parts of the PNS?
All the other nerves and neurons in your body.
Detects the stimulus and sends messages to the CNS
Sensory Neurons
Sends the signal away from the cell body
Axon
You hear your alarm and choose to snooze it.
You smell smoke and leave the room.
Smell smoke>sensory neurons(nose)>brain>motor neurons(legs)>leave the room
Give an example of a autonomic response?
Breathing, blinking, sneezing
These responses are voluntary
Somatic
The gap between 2 cells
Synapse
Why are reflexes usually faster than a conscious response?
Reflexes stop at the spinal cord because they automatic and do not require you to use your brain to make a decision.
A loud noise makes you jump.
Hear loud noise>sensory neurons(ears)>spinal cord>motor neurons(legs)>jump
Give an example of a somatic response
Talking, walking, eating