nerve action Flashcards
what is the myelin sheath
fatty layer along the axon
what does the myelin sheath do
speeds up nerve transmission
what is a Schwann cell
this is wrapped around the axon
what is an axon
this is the terminal at the end of the neurones which are used to communicate with other neurones
what is a nucleus
contains the DNA
what is a dendrite
branch like structure which carries nerve impulses to the next neurone
what is the nodes of Ranvier
these are gaps within the myelin sheath which speed up the impulses by forcing them to jump across the gaps
what is a motor neurone
connects the central nervous system to the muscles and glands
what is a relay neurone
acts as a connection between sensory/ motor neurones and other relay neurones
what is a sensory neurone
carries impulses from the peripheral nervous system to the central nervous system
what is a synapse
this is a gap between neurones and muscle cells
how is a neurotransmitter produced
this occurs when a nerve impulse arrives at a synapse
what is the purpose of the pituitary
regulates the other endocrine glands
where is the pituitary located
the base of the brain
which hormones are produced in the pituitary
somatotropin
prolactin
LH/FSH
oxycotin
ADH
what is the action of somatotropin
bone growth
what is the action of prolactin
produces breast milk
what is the action of LH and FSH
controls the menstrual cycle
what is the action of oxycotin
initiates contraction of the uterus
what is the action of ADH
triggers uptake of water from urine into the kidneys
where is the thyroid located
In the neck
What does thyroxine do
Regulates the cell metabolism
What does calcito run do
Regulates calcium absorption and use
which hormones are produced at the thyroid
-Thyroxine
-Calcito run
Which hormones are produced at the pancreas
-insulin
-glucagon
Where is the adrenal gland located
Above the kidney
Which hormone is produced at the adrenal gland
Adrenaline
What is the function of adrenaline
Prepared the body for action
what are hormones
-chemical messengers
-produced by glands/organs
-carried by blood
-they act on specific organs
