BIOL 1201 FINAL SIEBENALLER LSU TEST QUESTIONS WITH CORRECT DETAILED ANSWERS
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Course
BIOL 1201 SIEBENALLER LSU
Institution
BIOL 1201 SIEBENALLER LSU
BIOL 1201 FINAL SIEBENALLER LSU TEST QUESTIONS WITH CORRECT DETAILED ANSWERS
NEURONS: Support Cells: Schwann Cells - Answer-- In PNS (nerves outside of the brain- spinal column)
- Form myelin sheath that insulates that axon of vertebrates in the PNS
NEURONS: Nodes of Ranvier - Answer-- Non-i...
BIOL 1201 FINAL SIEBENALLER
LSU TEST QUESTIONS WITH
CORRECT DETAILED ANSWERS
NEURONS: Support Cells: Schwann Cells - Answer-- In PNS (nerves outside of the
brain- spinal column)
- Form myelin sheath that insulates that axon of vertebrates in the PNS
NEURONS: Nodes of Ranvier - Answer-- Non-insulated regions along the axons
- Salutatory conduction of the nerve impulses
What is the function of the sodium-potassium pump? - Answer-To maintain regulated
levels of concentrations of Na & K inside a cell, they remove excisions from the inside &
replace it with other ions from outside the cell
What are relative conc. of Na & K in the intracellular & extracellular compartments? -
Answer-- Intracellular —> High in potassium and low in sodium
- Exracellular—> Low in potassium and high in sodium
What is a synapse? - Answer-Gap between nerve ends: junction between 2 nerve cells,
where the club-shaped tip of a nerve fiber almost touches another cell in order to
transmit signals
What is its (synapse) role in signaling? - Answer-To transmit info to other nerve cells
What is a Ligand-gated channels? - Answer-Channels whose opening depends on the
binding of a ligand
If you release a neurotransmitter and you're opening some channels on a cell, how do
you terminate the message? - Answer-The neurotransmitter will either become broken
down by an enzyme, such as acetylcholinesterase, or be taken back up by the neuron
to become recycled
What is a Voltage-gated channel? - Answer-Class of transmembrane ion channels that
are activated by changes in electrical membrane potential which are located near the
channel
Voltage-gated channels: Transmembrane ion channels - Answer-These types of ion
channels are especially critical in neurons, but are common in many types of cells
, Voltage-gated channels - Answer-Have crucial role in excitable neuronal and muscle
tissues, allowing a rapid and coordinated depolarization in response to triggering
voltage change
- Directionally propagate electrical signals
Where are Ligand-gated & Voltage-gated found? - Answer-- Ligand- gated—> Near the
synapse
- Voltage-gated—> Along the axon and at the synapse
IPSP- What is this? Hyper- or de- polarizing? - Answer-- Inhibitory postsynaptic
potential
- Occurs when potassium channels open
- Hyper-polarizing
EPSP- What is this? Hyper- or de- polarizing? - Answer-- Excitatory postsynaptic
potential
- Occurs when sodium channels open
- De-polarizing
What is summation? - Answer-- Add together IPSPs and EPSPs that are impending on
the cell
- If sum EXCEEDS threshold, will result in action potential
- If the sum is LESS than the threshold, will result in NO action potential
What are 2 types of summation? - Answer-- Temporal
- Spatial
Summation: Temporal - Answer-Adding together impulses arriving the same TIME
Summation: Spatial - Answer-Adding together impulses arriving in the same PLACE
What do action potentials look like? - Answer-Nerve impulses
What channels are open/closed at each phase? Resting State: - Answer-- -70mV
- Na & K voltage-gated ion channels are closed
What channels are open/closed at each phase? Threshold Stimulus: - Answer--
Smallest depolarization voltage req. elicit an action potential
- Second phase of the action potential
What channels are open/closed at each phase? Rising phase: - Answer-- Na channels
open letting influx of Na to move into the cell
- K channels will stay closed since the outside of the cell has such a high Na count
- Na channels open
- K channels stay closed
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