BIOL 253 lab final UNC UPDATED
ACTUAL Exam Questions and CORRECT
Answers
An EMG records
- Contractile strength of muscle
- The electrical activities of muscle fibers within a muscle
- The electrical activity of motor neurons - CORRECT 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. - CORRECT
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 - CORRECT ANSWER - motor unit
Do all muscles within a motor unit act synchronously or asynchronously? - CORRECT
ANSWER - synchronously
a phenomenon in which contraction of an agonist muscle leads to minor activity in the antagonist
muscle - CORRECT ANSWER - coactivation
,(agonist/antagonist) muscles are sometimes called "prime movers" as they are the primary
muscle responsible for generating movement through their contraction. - CORRECT
ANSWER - agonist
(agonist/antagonist) muscles control (or oppose) specific movement, and return the muscle to its
initial position. - CORRECT ANSWER - antagonist
true/false : agonist & antagonist can change roles depending on the movement - CORRECT
ANSWER - true
Together, the agonist and antagonist muscles are known as what? - CORRECT ANSWER -
antagonistic pair
Coactivation is the phenomenon whereby the contraction of a muscle leads to what change?
- More minor activity in the antagonist muscle.
- More minor activity in the agonist muscle.
- No change in activity of the antagonist muscle - CORRECT 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. - CORRECT
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 - CORRECT 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. - CORRECT 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
- Motor
- Sensory
- All of the above - CORRECT ANSWER - motor
Those suffering from Peripheral neuropathy experience dysfunction in which areas?
- Autonomic
- Motor
- Sensory
- All of the above - CORRECT ANSWER - all of the above
symptoms of autonomic dysfunction? - CORRECT ANSWER - abnormal blood pressure,
abnormal heart rate, sexual dysfunction
Diseases of the NMJ, also referred to as what? - CORRECT ANSWER - endplate disease
ACTUAL Exam Questions and CORRECT
Answers
An EMG records
- Contractile strength of muscle
- The electrical activities of muscle fibers within a muscle
- The electrical activity of motor neurons - CORRECT 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. - CORRECT
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 - CORRECT ANSWER - motor unit
Do all muscles within a motor unit act synchronously or asynchronously? - CORRECT
ANSWER - synchronously
a phenomenon in which contraction of an agonist muscle leads to minor activity in the antagonist
muscle - CORRECT ANSWER - coactivation
,(agonist/antagonist) muscles are sometimes called "prime movers" as they are the primary
muscle responsible for generating movement through their contraction. - CORRECT
ANSWER - agonist
(agonist/antagonist) muscles control (or oppose) specific movement, and return the muscle to its
initial position. - CORRECT ANSWER - antagonist
true/false : agonist & antagonist can change roles depending on the movement - CORRECT
ANSWER - true
Together, the agonist and antagonist muscles are known as what? - CORRECT ANSWER -
antagonistic pair
Coactivation is the phenomenon whereby the contraction of a muscle leads to what change?
- More minor activity in the antagonist muscle.
- More minor activity in the agonist muscle.
- No change in activity of the antagonist muscle - CORRECT 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. - CORRECT
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 - CORRECT 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. - CORRECT 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
- Motor
- Sensory
- All of the above - CORRECT ANSWER - motor
Those suffering from Peripheral neuropathy experience dysfunction in which areas?
- Autonomic
- Motor
- Sensory
- All of the above - CORRECT ANSWER - all of the above
symptoms of autonomic dysfunction? - CORRECT ANSWER - abnormal blood pressure,
abnormal heart rate, sexual dysfunction
Diseases of the NMJ, also referred to as what? - CORRECT ANSWER - endplate disease
