Lesson 5 Flashcards
(36 cards)
What is the nervous system
The body’s communication system that allows it to respond to things going on outside and inside it
What’s a neuron
A cell that carries information through the nervous system
What is a neuron made of
dendrites, which pick up information and give it to the axon which sends it away from the nerve cell
Name the two types of nervous system
Central and peripheral
What makes up the central nervous system
Brain and spinal cord
What make up the peripheral nervous system
The network of nerves that branch out from the cns and go to the rest of the body
Name all three neuron
Sensory, which picks up stimuli from internal or external environments and converts it to a message. Interneuron, which carries the message from one neuron to the next. And motor, which sends the message to a muscle or a gland, which reacts accordingly
What is a nerve impulse
The message carried by the neuron
What is a synapse
The junction where one neuron can transfer an impulse to another
What happens at the axon tips
The electrical signals turn to chemical ones so they can move on to the next neuron
What are the three parts of the brain
The cerebrum, cerebellum, and brain stem
What does the cerebrum do
Interpret input, controls movement, and carries out complex mental processes like learning and remembering
What does the cerebellum do
Coordinates your muscles and helps you keep balance
What does the brain stem do
Controls your involuntary actions
What is the brain
Located in the skull and controls most functions of the body. Made up of lots of interneurons and covered in layers of connective tissue and fluid to protect itself from injury
What is the spinal cord
A thick column of nervous tissue that links the brain the the nerves that branch out through the body. Surrounded by layers of connective tissue and fluid
How many pairs of nerves does the peripheral nervous system have
43
What does the peripheral nervous system do?
Controls the entire body, both voluntary and involuntary actions
Somatic systems?
Voluntary actions
Autonomic systems
Involuntary actions
What’s a reflex
An automatic response that occurs without conscious control
What’s a reflexive arch
Sensory neurons detect stimulus send impulses to spinal cord, internurons in spinal cord carry impulses to motor neurons to make you move via muscle contractions and impulses go to the brain for you to remember them
What does the endocrine system do
Regulates the body by releasing chemicals called hormones
What is the endocrine system made of
Different glands
