5 Written questions
5 Matching questions
- If a neuron synapses on a second neuron and drives the resting membrane potential further from threshold, what is this called? Where does it occur?
- What parts of neurons are found in gray matter? White matter? Why is it white?
- What is a presynaptic neuron? Postsynaptic neuron? Define converge, divergence of neurons.
- Define excitability. What kinds of cells possess excitability?
- Describe the ionic basis for an action potential (depolarization). What is the ionic basis for repolarization? What is hyperpolarization? What ions are involved?
- a Cell bodies found in gray matter
Because the tissue is composed of fatty tissue.
- b Presynaptic - The neuron that sends the action potential to the next dendrite
Postsynaptic - Receives the message
Convergence of Neurons - First one neuron is influenced by many others, resulting in a convergence of input.
Divergence of Neurons - When the neuron fires, the signal is sent to many other neurons, resulting in a divergence of output.
- c IPSP, Inhibitory Post Synaptic Potential.
- d Able to receive impulse from action potentials
- e Depolarization - Potential difference becomes smaller or less polar. If extracellular concentration of K+ increases, there is less gradient between inside and outside.
Hyperpolarization - Potential difference becomes greater or more polar. If extracellular concentration of K+ decreases, steeper gradient between inside and outside
5 Multiple choice questions
- 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
- 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.
- 3 Na out, 2 K in
Everywhere except the brain
- A bundle of neurons that travel to and from the same place.
5 True/False questions
Which channels are activated for depolarization in an action potential? → In the spinal cord
What is salutatory conduction of an action potential? Does it occur in all nerve fibers? How does diameter of a nerve fiber affect speed of conduction? → ...
What is the role of a neurotransmitter? What is Ach? What are cholinergic synapses? What kind of transmitters are dopamine and serotonin? → To travel across the synapse and get the action potential to the next neuron
Ach is acetylcholine
Cholinergic synapses -
Name the 3 types of neurons (based on structure). → Unipolar
How does nerve tissue respond to injury? What cells are responsible for the repair? Where can it occur? → Not really.