the thick filaments of sarcomeres are composed of _____.

the thick filaments of sarcomeres are composed of _____.

Asked by 2 years ago
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The thick filaments of sarcomeres are composed of _____.myosin
The thin filaments of sarcomeres are composed of _____.actin
A single muscle cell is referred to as a _____.muscle fiber
During the course of muscle contraction the potential energy stored in ATP is transferred to potential energy stored in _____.the myosin head
The release of _____ ions from the sarcoplasmic reticulum is required for skeletal muscle contraction.calcium
Myosin heads bind to _____, which they then pull and cause to slide toward the center of the sarcomere.thin filaments
Of these events, the first to occur when a motor neuron stops sending an impulse to a muscle is _____.the pumping of calcium ions out of the cytoplasm and back into the sarcoplasmic reticulum
Which muscle type is involved in the function of the digestive tract and blood vessels?smooth
How does cardiac muscle differ from the other types of muscle?It contains branched cells.
True or false? Myofibrils are the alternating light-dark units that produce the banded appearance of muscle fibers.False
Which molecules form the thick filaments of sarcomeres?Myosin
Which of the following interactions is the molecular basis of muscle contraction?Myosin and thin filaments.
Which step constitutes the power stroke of muscle contraction?The phosphate ion is released, and the myosin head moves back to its original position.
Which of the following statements about the stimulation of muscle cells is true?An action potential in a muscle cell ultimately results in the release of calcium ions into the cell.
A skeletal muscle deprived of adequate ATP supplies willenter a state where actin and myosin are unable to separate.
The calcium ions released into the cytosol during excitation of skeletal muscle bind totroponin
Calcium ions initiate sliding of filaments in skeletal muscles bybinding to the troponin complex, which then relocates tropomyosin.
In a relaxed skeletal muscle, actin is not chemically bound tomyosin
Skeletal muscle contraction begins when calcium ions bind totroponin
A skeletal muscle with abnormally low levels of calcium ions would be impaired ininitiating contraction.
Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber? 1. Tropomyosin shifts and unblocks the cross-bridge binding sites. 2. Calcium is released and binds to the troponin complex. 3. Transverse tubules depolarize the sarcoplasmic reticulum. 4. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP. 5. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane.5 3 2 1 4
The hydrostatic skeleton of the earthworm allows it to move around in its environment byusing peristaltic contractions of its circular and longitudinal muscles.
An endoskeleton is the primary body support for thecartilaginous fishes, including sharks.
During the contraction of a vertebrate skeletal muscle fiber, calcium ionsbind with troponin, changing its shape so that the myosin-binding sites on actin are exposed.
Identify the role(s) of ATP in muscle contraction.Binds to myosin to break an actin-myosin cross-bridge Provides the energy to convert myosin to a form that forms a cross-bridge with actin
Plasma membranes of adjacent cardiac muscle cells interlock at specialized regions called intercalated disks. What is the significance of this feature of cardiac muscles?The intercalated disks allow coordinated contraction of the whole heart.
the thick

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Views: 19
Asked: 2 years ago