nervous systems Flashcards
what are neurotransmitters
organic compounds that take nerve impulses across synapse
what are the excitatory neurotransmitter
acetylcholine (Ach), adrenalin (epinephrine) and noradrenaline (norepinephrine)
what is the enzyme for acetylcholine
acetylcholinesterase (Ache)
what are cranial nerves
12 pairs of nerves that serve the neck up
what is the exception of cranial nerves
the vagus nerve
what is vagus nerve
serves internal organs
what is there spinal nerves
31 pairs serves and has two beaches
what are the two branches of spinal nerves
dorsal root and ventral root
what is the dorsal root
has sensory neurons that conduct impulses towards cords
what is ventral root
has motor neurons that conduct impulses away from cord
what do the excitatory messages from neurons tell other neurons
they tell the neuron to fire
what do the inhibitory messages from neurons tell
they tell the neurons not to fire
what do receptors in somatic nervous system
exterior sense organs ( receives stimulus)
what do effectors in somatic nervous system
muscle carriers out response
what is the 5 steps of relax arc
1 receptors 2 sensory 3interneuron 4 motor 5 effector
