A function of muscle tissue is?
A, B and C are correct (to stabilize body position, generates heat, propels materials through body systems)
A, B and C are correct (attaches a muscle to a bone, is an extension of the fused endomysium, perimysium and epimysium of a muscle, contains parallel bundles of collagen fibers)
Which of the following stimulates skeletal muscle contraction?
are composed primarily of myosin.
include the contractile proteins actin and myosin.
How is excitation of the sarcolemma coupled to the contraction of a muscle fiber?
Excitation continues into the T-tubules causing Ca2+ release channels to open, thus starting a contraction cycle.
A skeletal myofiber
is derived from embryonic cells called myoblasts.
is enriched with glycogen.
are composed of actin, troponin and tropomyosin.
The ability of a muscle tissue to stretch without being damaged is called
Which of the following is NOT true?
Several nerves accompany each artery that penetrates a muscle cell.
Anaerobic cellular respiration
A and B are correct (converts glucose to pyruvic acid and ultimately to lactic acid, can produce energy for 30-40 seconds of contractions)
Which of the following is a function of muscle tissue?
controlling flow of materials out of the stomach and urinary bladder
is regulated by the nervous system and hormones.
When calcium ions are released from the sarcoplasmic reticulum and bind to troponin, allowing the myocin heads to bind to actin this is called the:
A neuromuscular junction (NMJ)
is the synapse of a motor neuron with a muscle fiber.
provides a route for lymphatic and blood vessels as well as nerves to enter muscles.
Smooth muscle tone is caused by
calcium ions moving slowly out of the muscle cells
An adult has more muscle mass than a child. How did that increase in muscle mass occur?
Wave summation in a muscle fiber
A, B and C are correct (occurs when additional stimuli arrive before the fiber has relaxed after the initial stimulus, usually result in subsequent contractions that are stronger than the 1st, may result in muscle fiber tetany)
Place the events of a contraction cycle in the order in which they occur:
1. ATP hydrolysis
2. detachment of myosin head from actin
3. power stroke
4. crossbridge formation
1, 4, 3, 2
Which of the following does NOT happen during a muscle contraction?
The thick and thin filaments shorten.
Regeneration of skeletal muscle
A and C (is due to the presence of a few satellite cells, is low, with mostly fibrosis taking place)
Consider the muscles of a catcher for a professional baseball team. The player must be able to squat for one to three minutes at a time, but also must be able to suddenly stand and forcefully throw a ball to any of the three bases of the infield. Which of the following must true of the training regimen for a catcher?
A and B are correct (exercises that increase the size, strength and glycogen content of fast glycolytic fibers will help the catcher have the strength to throw the ball to the bases, exercises that increase the size, strength and myoglobin content of slow oxidative fibers will help the catcher maintain the squatting position for longer periods of time)