Unit four- homeostasis and the nervous system Flashcards
what is stimulus
a change in the enviroment
what is a response
the body’s reaction to stimulus
what is a receptor
cells that receive stimulus
what is an effector
2 examples
area of body that responds to the stimulus
-muscles and glands
what do glial cells do
-support neurons
-remove waste
-defend against infections
what do neurons do
-transmit bio-electrical impulses
-communication network between CNS and the body
what are nerves made of
a bundle of neurons
what are the 3 parts of the neurons
-cell body
-dendrits
-axon
what does the cell body of a neuron do
-contain nucleus
what does the dendrites of a neuron do
-carry electrochemical signals to the cell body
what does the axon of a neuron do
carry impulses away from cell body
what are schwann cells
- glial cells
-surround the axon
-form a myelin sheath (phospholipid layer)
what is in between schwan cells
node of ranvier
what is between the axon and the dendrite of a neuron
synapse neurotransmitter
-help impulses pass the synapse
what are the three tyeps of neurons
-sensory
-motor
-interneurons
