BIOL 253 lab Final UNC Exam Study Guide.
An EMG records
- Contractile strength of muscle
- The electrical activities of muscle fibers within a muscle
- The electrical activity of motor neurons - answerThe electrical activities of muscle fibers
within a muscle NOT contractile strength
In surfa...
- Contractile strength of muscle
- The electrical activities of muscle fibers within a muscle
- The electrical activity of motor neurons - answer✔✔The electrical activities of muscle fibers
within a muscle NOT contractile strength
In surface EMG:
- At any time, the signal provides information about the relative number of motor units that are
active at that time.
- The activity of every motor unit can always be seen as a separate event.
- The recorded signal shows the skeletal muscle membrane potentials. - answer✔✔- At any time,
the signal provides information about the relative number of motor units that are active at that
time.
what is a neuron and the muscle fibers it controls - answer✔✔motor unit
Do all muscles within a motor unit act synchronously or asynchronously? -
answer✔✔synchronously
a phenomenon in which contraction of an agonist muscle leads to minor activity in the antagonist
muscle - answer✔✔coactivation
(agonist/antagonist) muscles are sometimes called "prime movers" as they are the primary
muscle responsible for generating movement through their contraction. - answer✔✔agonist
(agonist/antagonist) muscles control (or oppose) specific movement, and return the muscle to its
initial position. - answer✔✔antagonist
true/false : agonist & antagonist can change roles depending on the movement - answer✔✔true
Together, the agonist and antagonist muscles are known as what? - answer✔✔antagonistic pair
- More minor activity in the antagonist muscle.
- More minor activity in the agonist muscle.
- No change in activity of the antagonist muscle - answer✔✔More minor activity in the
antagonist muscle.
Which of the following statements regarding coactivation is false?
- Coactivation in the antagonist muscle provides an example of eccentric contraction.
- Coactivation is associated with a smaller EMG recording from the agonist muscle compared to
that in the antagonist muscle.
- Coactivation is seen in the antagonist muscle during isotonic contraction. - answer✔✔-
Coactivation is associated with a smaller EMG recording from the agonist muscle compared to
that in the antagonist muscle.
In skeletal muscle, ATP is not generated through:
- Aerobic metabolism
- Anaerobic metabolism
- Breakdown of phosphocreatine
- Lactic acid metabolism - answer✔✔- Lactic acid metabolism
How could you relieve fatigued muscles?
- Drink highly caffeinated beverages to regain your energy.
- Keep pushing through the pain.
- Rest the muscles to allow blood flow to re-establish pH and replenish nutrients needed for ATP
production. - answer✔✔Rest the muscles to allow blood flow to re-establish pH and replenish
nutrients needed for ATP production.
Those suffering from motor neuron disease experience dysfunction in which areas?
- Autonomic
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