Skeletal Muscle Anatomy
What is the functional unit of a skeletal muscle termed?
Sarcomere
Sarcoplasmic reticulum
A single contraction in response to a single stimulus is defined as what?
A twitch
The energy source that is used directly for muscle contraction is [blank].
ATP
A sheetlike extension of the epimysium is called a what?
Aponeurosis
Calcium ions will bind to [blank] when present in the sarcoplasm.
Troponin
What is the force exerted by a contracting muscle called?
Muscle tension
Muscle soreness may be due in part to which pathway of ATP production.
Phosphorylation
Aerobic respiration
Anaerobic glycolysis
Oxidation
Anaerobic glycolysis
Thick filaments are found in the [blank] of the sarcomere?
Light I band or Dark A band
Dark A band
What substance must bind to myosin heads in order for the heads to detach from the thin filaments?
ATP
The time that elapses between the stimulation of a muscle and the contraction of that muscle is defined as what?
Latent period
After about 30 minutes of exercise, which substance becomes the major source of fuel?
Glucose
Pyruvic Acid
Fatty Acid
Lactic Acid
Fatty acid (fats)
In a resting muscle cell, the myosin-binding sites are blocked by what?
Tropomyosin
Calcium is released from the terminal cisterns in response to what?
An action potential
Which is NOT a factor that affects the force of muscle contraction?
Relative size of muscle fibers
Number of muscle fibers stimulated
Degree of muscle stretch
Method of muscle stimulation
Method of muscle stimulation
Which activity would be most dependent upon creatine?
Tennis
Soccer
Jogging
Diving
Diving
T tubules are an extension of the [blank].
Sarcolemma
How does calcium reenter the terminal cisterns after muscle contraction is finished?
Active transport
Skeletal muscle contractions increase in strength because of what?
Recruitment of motor units
Which term refers to the length of time a muscle can continue to contract using aerobic pathways.
Aerobic threshold
Aerobic endurance
Anaerobic threshold
Anaerobic endurance
Aerobic endurance