5 Written questions
5 Matching questions
- How are electrical potentials of cell membranes measured?
- What is the role of a neurotransmitter? What is Ach? What are cholinergic synapses? What kind of transmitters are dopamine and serotonin?
- Do CNS nerve fibers generally regenerate?
- Define excitability. What kinds of cells possess excitability?
- Axons are classified into 3 groups according to the relationship between diameter, myelination and propagation speed: define Type A, B and C fibers.
- a To travel across the synapse and get the action potential to the next neuron
Ach is acetylcholine
Cholinergic synapses -
- b Type A - large-diameter, myelinated. Conduct at 15-120 m/s. Motor neurons supplying skeletal and most sensory neurons
Type B - medium-diameter, lightly myelinated. Conduct at 3-15 m/s. Part of ANS
Type C - small-diameter, unmyelinated. Conduct at 2 m/s or less. Part of ANS
- c Able to receive impulse from action potentials
- d Not really.
- e mV
5 Multiple choice questions
- 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
- Takes one neuron to affect the other neuron and dictate a response.
Receptor, sensory neuron, control center, motor neuron, effectors
- Through Neurotransmitters
Calcium has to go into the synapse to stimulate the vessels to open.
- 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.
5 True/False questions
What is axonal transport? What is the primary function of slow axonal transport vs fast axonal transport? → Axonal transport is a cellular process responsible for movement of mitochondria, lipids, synaptic vesicles, proteins, and other cell parts (i.e. organelles) to and from a neuron's cell body, through the cytoplasm of its axon
What is an EPSP and a IPSP? Are these graded potentials, action potentials, or can they be both? → Voltage Gated Na+ Channels
Describe the structure of a typical neuron. Identify as to structure and function: a cell body; dendrite; axon; microtubules; Nissl bodies; axon hillock. → Unipolar
Is the resting membrane of a nerve fiber more permeable to sodium ions or to potassium ion? → Only allows certain things through.
What advantage does having a myelin sheath give to a nerve fiber? → Means that action potential doesn't have to travel down the entire axon, just jumps from node to node.