Nervous System Flashcards
(21 cards)
3 functions of the nervous system?
- Interprets and responds to sensory information
- Homeostasis
- Experience emotion + learn and reason
4 components of nervous response?
- Receive
- Transmit
- Interpret
- Respond
2 functions of the autonomic nerves?
- Sympathetic
- Parasympathetic
What is the sympathetic response?
Prepares body for stress (fight vs flight)
What is the parasympathetic response?
Opp of sympathetic (rest and digest)
What do neurons do?
Conduct impulses and respond to stimuli.
(Bundled into tissues called nerves)
What is the coordinating center?
The spinal cord
Define membrane potential
Charges difference in out and in of neuron
Membrane is more permeable to potassium (K). True or false?
True
What happens to the membrane when a nerve impulse arrives?
Changes permeability. (Other proteins in membrane)
What happens at the peak of action potential?
Sodium channels close and potassium channels open.
What is the refractory period?
Period of hyperpolarization (overshoot) and other action potential cannot be started.
define threshold level.
Minimum stimulus needed to produce response.
- different in each neuron
Define saltatory conduction
Rapid transmission of action potential
- only happens at nodes of Ranvier
2 ways intensity can be increased
- Frequency (pressure)
- More neurons are stimulated
Define neuromuscular junction
- Synapse where motor neuron transmits to muscle
Is excitatory allowing sodium to pass? What about inhibitory?
E = Sodium in
I = Potassium out
Define integration
Summary of all the excite and inhibitory neurotransmitters
Total integration of signal reaches threshold, what happens?
Action potential happens
3 important neurotransmitters and their function
ANG
1. Acetylcholine (excitatory in effectors)
2. Norepinephrine (both)
3. GABA (inhibit in brain, helps stimuli)
How is ACh absorbed?
Reabsorbed through protein channels and broken down.
