EPT2 Flashcards
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Each muscle fiber is innervated by only one motor neuron
true
Slow twitch fibers have the greatest oxidative capacity
true
Larger muscles generate more force than smaller muscle
true
Larger motor units are recruited when smaller amounts of force are needed
false
If the charge inside the cell decreases, the cell is depolarized
false
Motor learning can account for as much as 50% of the overall gain in strength
true
Chronic hypertrophy is caused by fluid shifts and does not have any real gains in strength
false
Muscle size is partly responsible for gains in muscular strength
true
One way to improve muscular power is to perform plyometric exercises, which take advantage of the body’s natural reflex response, through the use of the stretch-shortening cycle
true
Exhalation of air results in expansion of the rib cage and lungs
false
if a motor unit receives an impulse, every muscle that is connected will contract
true
During breathing at rest, both inspiration and expiration are active processes
false
The absolute refractory period is where the neuron could respond to a stimulus if the stimulation was sufficient
false
Resistance training is safe for all individuals, regardless of age, with appropriate safeguards in place
true
The amount of oxygen in arterial blood increases from rest to exercise
false
The red blood cells are ~98% saturated with oxygen when leaving the lungs
true
ATP is needed to break apart the actin and myosin in order to re-orient themselves and create another “power stroke”
true
CO2 production is the main driver of increased ventilation
true
Chemoreceptors are located in the brain, carotid bodies, and aortic arch and help to increase ventilation
true
Individuals with COPD may have their lungs limit their aerobic exercise performance
true
The basic unit of the muscle is
Sarcromere
Which part of the muscle contains only actin
I band
A single motor neuron and all of the muscle fibers it innervates describes
Motor unit
As a result of muscular shortening, which part of the muscle stays the same length?
A band
Which mineral is involved in the sliding filament theory
Calcium
Which neurotransmitter is involved in the sliding filament theory
Acetylcholine
Which nervous system is known as “fight or flight”
Sympathetic Nervous System
In the sodium-potassium pump, there are__sodium pumped out for every__potassium pumped in
3; 2
The place where the a-motor neuron communicates with the muscle fibers is
Neuromuscular junction
The definition of muscular strength is
The max force that a muscle or muscle group can generate
The speed of a neural impulse is dependent on
Myelinization and axon diameter
Bobby comes to you for help developing and implementing a resistance training program so that he can improve muscular strength; he has never done resistance training before. Which of these FITT principles would you select for him.
F: 2-3 days/wk
I: 6-8RM
T: 30 min. per workout
T: 10 exercises (machine weights) that target major muscle groups
A protocol that could be used to assess muscular power could be__
Broad jump
Varying the training intensity at different time points in the year allows an individual to peak in muscular strength at the appropriate time describes__
Periodization
At a given temperature, pressure x volume is constant describes
Boyle’s gas law
Respiratory system can limit exercise performance in patient populations
A and B are correct
A. Obstructed airways
(B. Restrictive airways)
The right shift of the oxyhemoglobin dissociation curve
Both A and B are correct
A. known as the Bohr effect
(B. Occurs during exercise)
The bulk of CO2 is transported via
Bicarbonate
Which of the following breathing irregularities increases intra-abdominal and intra-thoracic pressure
Valsalva maneuver
The test that allows exercise physiologists to identify whether lungs limit aerobic exercise
Maximal voluntary ventilation
