Which of the following is associated with smooth muscle contraction? Troponin as calcium-sensing protein. Contraction based on the sliding filaments theory. Calcium-induced calcium release mechanism. Electromechanical calcium release mechanism. Contraction requires myosin light-chain kinase activity

Which of the following is associated with smooth muscle contraction? Troponin as calcium-sensing protein. Contraction based on the sliding filaments theory. Calcium-induced calcium release mechanism. Electromechanical calcium release mechanism. Contraction requires myosin light-chain kinase activity

Lifetime Physical Fitness & Wellness

15th Edition

ISBN:9781337677509

Author:HOEGER

Publisher:HOEGER

Chapter7: Muscular Fitness

Section: Chapter Questions

Problem 5AYK

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Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the above
Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
The _____ is the basic unit of muscle contraction. a. myofibril b. sarcomere c. muscle fiber d. myosin filament
Which of the following does not occur during the excitation contraction coupling of skeletal muscle? Opening of ryanodine receptor calcium channels Calcium binding to troponin Tropomyosin shifting away from myosin binding sites on the actin An end plate potential
Which of the following summarizes the role of calcium in muscle contraction? opens the binding sites for cross bridge activity neurotransmitter that initiates the motor impulse for a contraction to occur restabilizes the ion concentration for sustained contractions
Tetanus is a phenomenon where muscle fibers are continuously contracted. What best explains this? Large action potentials on the sarcolemma Increase in acetylcholinesterase increase in the lag phase Increase in calcium pump activity Calcium remains elevated in the sarcoplasm
Skeletal muscle will be released in its contracted (rigor) state when: Group of answer choices ATP is hydrolyzed into forming ADP and inorganic phosphate. ATP binds to the myosin head. ADP is dissociated from the myosin head. ATP binds to the actin G-molecule.
Which of the following correctly states the importance of an action potential to muscle contration? The SR will only release Ca2+ if it has been electrically stimulated. Sarcomeres require a negative electrical charge to start sliding. Actin and myosin must be electrically charged to create a cross-bridge. ATP cannot be split into ADP and Pi without an action potential.
Each of the pairs of phrases below describe steps during skeletal muscie contraction. The 2nd phrase should take place after the 1st phrase. Which of the pairs of phrases is out of order? muscle cell action potential leads to neurotransmitter release motor neuron action potential leads to muscle cell action potential sarcolemma depolarization leads to an increase in cytosolic calcium rise in cytosolic calcium leads to cross bridge cycle
Which of the following is NOT correct regarding muscle contraction? O Ca++ in the sarcoplasm returns to the nucleus to be stored ATP needs to be present for muscle relaxation A neurotransmitter is released at the neuromuscular junction ATP needs to be present for muscle contraction
Arrange the steps of muscle innervation and contraction in response to touching a hot plate. appendage is removed from stimulus v movement is produced muslce fibers work together to produce action muscle contraction occurs and the sarcomere shortens Myosin heads bind thin filament Calcium binds troponin Calcium is released T tubules carry the action potential to the sarcoplasmic reticulum Action potential is generated in the sarcolemma as a result of opened sodium channels The presynaptic cell releases acetylcholine Signal arrives at the neuromuscular junction Sensory receptors detect uncomfortable heat Afferent neurons carry impulse to the central nervous system Signal reaches the reflex arc in the central nervous system and is directed out through the anterior horn Signal travels through the motor units > |> > > |> > > > > > > > >
Put in order the steps of activation, excitation and contraction of skeletal muscle.