5 Written questions
5 Matching questions
- What is the refractory period (absolute and relative)? What are the ligand gated channels doing at this time?
- What is the role of a neurotransmitter? What is Ach? What are cholinergic synapses? What kind of transmitters are dopamine and serotonin?
- How is the sodium-potassium pump related to the resting potential of the nerve fiber?
- How are nerve impulses transmitted across synapses? Compare this to transmission of an impulse from nerve fiber to muscle fiber. Is transmission of the impulse across a synapse one-way? What role does calcium play in the release of a neurotransmitter?
- How are electrical potentials of cell membranes measured?
- a mV
- b Absolute Refractory Period - complete insensitivity exists to another stimulus. Voltage gated Na+ Channels open and close.
Relative Refractory Period - follows the absolute period, membrane is more permeable to K+ because many voltage gated K+ channels are open.
- c To travel across the synapse and get the action potential to the next neuron
Ach is acetylcholine
Cholinergic synapses -
- d Through Neurotransmitters
Calcium has to go into the synapse to stimulate the vessels to open.
- e In order to get back to polarization, they have to pump in 3 Na out, 2 K in
5 Multiple choice questions
- Dendrites coming into cell body
cell body contains the nucleus goes into the axon starting with the axon hillock
the axon travels down to axon terminals
- The fact that the cell membrane is relatively negative and they are charged ions inside and outside the cell.
Concentration gradients involved because K+ ions are inside, Na+ ions are outside. Keep polarity of cell in check.
Everywhere except the brain
- Voltage Gated Na+ Channels
- IPSP, Inhibitory Post Synaptic Potential.
5 True/False questions
What is summation? Temporal and spatial summation result in what? → Certain stimulus happens repeatedly, and adds to threshold in order to get an action potential.
Results in threshold
What gives peripheral nerves their white appearance? → Mylination
Do CNS nerve fibers generally regenerate? → Not really.
What is the most immediate effect of application of a threshold stimulus to a nerve fiber membrane? → Salutatory conduction of an action potential is when you jump from node to node.
You may recall that a muscle fiber is an entire muscle cell; is a nerve fiber an entire neuron? (explain) → Means that action potential doesn't have to travel down the entire axon, just jumps from node to node.