5 Written Questions
5 Matching Questions
- What is the role of a neurotransmitter? What is Ach? What are cholinergic synapses? What kind of transmitters are dopamine and serotonin?
- What advantage does having a myelin sheath give to a nerve fiber?
- What is membrane permeability?
- How is the sodium-potassium pump related to the resting potential of the nerve fiber?
- Describe two conditions that allow maintenance of the resting membrane potential. How are concentration gradients involved?
- a Only allows certain things through.
- b Means that action potential doesn't have to travel down the entire axon, just jumps from node to node.
- c To travel across the synapse and get the action potential to the next neuron
Ach is acetylcholine
Cholinergic synapses -
- d 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.
- e In order to get back to polarization, they have to pump in 3 Na out, 2 K in
5 Multiple Choice Questions
- Central Nervous System (CNS) and Peripheral Nervous System (PNS)
Autonomic (involuntary). Within this, there are Sympathetic (Fight or Flight) and Parasympathetic (Rest and digest).
- A bundle of neurons that travel to and from the same place.
- Voltage Gated Na+ Channels
- 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.
- Not really.
5 True/False Questions
What is neuroglia? How do these cells compare (in structure, number, and function) to the neurons. What are the functions of each of the neuroglia? Which ones are in the CNS and which ones are in the PNS? → Neuroglia are cells that support and protect neurons
There are more neuroglia than neurons, they don't have dendrites or axons.
Astrocytes (CNS) - Forms blood brain barrier, protects neurons, allow the exchange of nutrients and waste
Oligodendricites - Mylinate the CNS
Epidymal (CNS) - Circulate the cerebral spinal fluid
Microglia - Eat debris in the CNS
Satellite and Schwann Cells are in the PNS.
What is an electrochemical gradient? → Only allows certain things through.
What is summation? Temporal and spatial summation result in what? → Only allows certain things through.
Describe the importance of the Schwann cells in regeneration of the nerve fiber following injury. → Schwann Cell wraps around the axon to form the myelin sheath.
Neurilemma is the plasma membrane of a neuron
Ranvier is the space between mylination
Define excitability. What kinds of cells possess excitability? → Only allows certain things through.