divisions of nervous system, endocrine system, neurons

What are the two branches of the nervous system

CNS central nervous system and PNS peripheral nervous system

What are the branches of the CNS

spinal cord and brain

what are the branches of the PNS

somatic (SNS) and autonomic (ANS)

What are the branches of the ANS

sympathetic and parasympathetic nervous system

what is the somatic subdivision

sensory and motor voluntary movement

what does the sympathetic subdivision do

increases heart rate and breathing rate, pupils dilate, inhibits digestion and saliva production - fight or flight system fueled by adrenaline

what does the parasympathetic subdivision do

decreases heart rate and breathing rate, pupils constrict, stimulates digestion and saliva digestion - rest and digest

what are the 3 types of neurons

sensory, motor, relay

function and structure of sensory neuron

stimulates electrical impulse from receptors to the relay neuron in CNS - cell body in the middle of axon, shorter axon and longer dendrites

function and structure of motor neuron

carries electrical impulse from CNS/relay neuron to effector organ causing a response - long axon and shorter dendrites + myelin sheath

function and structure of relay neuron

carries electrical impulse from sensory neuron to motor neuron across synapses - shorter dendrites and longer axon

what is the endocrine system

system of glands which produce hormones that are released into the bloodstream - helps regulate the activity of cells and organs in the body, communicates chemical messages to the organs of the body

pituitary gland

produces hormones in the brain which stimulate other glands to produce their hormones - regulatory function

what is the sympathomedullary pathway (SAM response)

1. threat processed by hypothalamus

2. activation of sympathetic branch of ANS

3. nerve message to adrenal gland

4. adrenaline released into bloodstream

5. fight or flight response

motor neurone

sensory neurone

relay neurone