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EBME 202 FINAL EXAM 2024 (UPDATED) QUESTIONS WITH COMPLETE SOLUTIONS!!
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EBME 202 FINAL EXAM 2024 (UPDATED) QUESTIONS WITH COMPLETE SOLUTIONS!!
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EBME 202 FINAL EXAM2024 (UPDATED)
QUESTIONS WITH
COMPLETE
SOLUTIONS!!
EBME 202
Evatee 8/31/24 EBME 202
,EBME 202 FINAL EXAM 2024 (UPDATED)
QUESTIONS WITH COMPLETE SOLUTIONS!!
What are the 3 primary mechanisms of ion transport through a membrane?
Answer - Simple diffusion, facilitated diffusion, & active transport
What are the 2 primary forces that affect ion movement through a membrane?
Answer - concentration gradient,
potential difference
If mutation in the sodium/potassium pump resulted in relatively less potassium
being moved across the nerve membrane, what would happen to the
membrane potential and excitability of the nerve? Explain. Answer - The
sodium-potassium pump maintains the concentration balance, maintains
negative voltage inside the cell, and maintains the cell volume. In nerve cells,
the sodium-potassium pump creates gradients of both sodium and potassium
ions. These gradients are then used to transmit electrical signals that travel
along nerves. Without this process, your nerve cells wouldn't function. The
sodium-potassium pump sets the membrane potential of the neuron by
keeping the concentrations of Na+ and K+ at constant disequilibrium. If less
potassium was being moved across the nerve membrane, the concentration of
potassium would be less on the inside while the concentration of sodium
would continue to increase on the outside. There would be little potassium and
sodium on the inside, but large concentrations of both on the outside which
would throw off the membrane potential.
*Increase in hyperpolarizability= decrease in membrane potential = decrease in
exciteability
, Draw the motor unit and label important components. Identify the range of
important dimensions. Answer - (Drawn on notecard)
The motor unit is composed of the neuron cell body located in the spinal cord,
the axon running from the spinal cord to the muscle, and all of the muscles
fibers innervated by that axon. It is the modular unit of control.
Plot a "standard" nerve action potential resulting from a depolarization. Label
the axes and show unit magnitudes for the axes. Describe what happens in a
voltage gated Na ion channel and how it relates to your figure. Answer -
(Drawn on notecard)
In a voltage gated Na ion channel there are 2 gates that function
independently. One is an activation gate that opens on stimulation and lets
sodium ions into the cell. The other is an inactivation gate that closes to stop
the entry of sodium ions.
At the resting potential, voltage-gated Na+ channels are closed. When the
membrane is depolarized, conformational changes open the voltage-gated
channel.
Type of transport: Facilitated transport
What else does this: K+ channels
What else drives this type of transport: Concentration gradient
If you are investigating a new reflex found in cheetahs during maximal running,
what size motor units would you expect to be involved? Why? Answer - You
would expect to find fast motor units. Fast motor units are fast and fatigable.
They have anaerobic metabolism and are used for mid to high force, short
duration forces. You would expect them to be large. The larger units produce a
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