Select the incorrect answer for skeletal muscle: Group of answer choices The time for the action potential is less than for force production A motor unit contains one neuron and only one muscle cell Fatigue is prevented when motor units take turns being activated Each myosin cross-bridge head that tightly binds actin contributes to force production. The sarcomere length influences contraction strength
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11. Age-associated motor unit remodeling, which includes loss of FF motor units and an increase in size of S motor units (i.e. more muscle fibers in each S motor unit), would be expected to have which of the following effects. a. A decrease in maximum shortening velocity. b. A decrease in fine motor control. c. A decrease in fatigability (greater endurance). d. All of the above. 12. An action potential in a cardiac myocyte (muscle fiber) a. causes action potentials in neighboring fibers. b. has the same basic properties as an action potential in a skeletal muscle fiber. c. determines the duration of the twitch. d. both a and b are correct. e. both a and c are correct. 13. Which of the following statements about smooth muscle is NOT true? a. Contraction is the result of an increase in intracellular [Ca2+]. b. Contraction is the result of an increase in myosin light chain kinase (MLCK) activity. c. Contraction is the result of phosphorylation of the troponin complex. d. Contraction can occur in the absence of action potentials. e. Contraction results from myosin cross-bridge interactions with actin.
Sri K.
26. In skeletal muscles, the combined amounts of creatine phosphate and ATP provide enough energy for the muscle to contract maximally for approximately 15 seconds. 27. Which of the following structures consists of a somatic motor neuron and all the skeletal muscle fibers it stimulates? Motor unit 28. A brief contraction of all muscle fibers in a motor unit in response to a single action potential moving down the somatic motor neuron is known as a twitch contraction. 29. Which of the following is also referred to as the period of lost excitability in skeletal muscle fibers? Latent period 30. A period of sustained skeletal muscle contraction in which individual twitches cannot be detected is called fused tetanus. 31. Increasing the number of active motor units within a skeletal muscle is called motor unit recruitment.
Adi S.
1. The combination of a single motor neuron and all the muscle fibers it innervates is a synapse. motor unit. motor neuron pool. type I muscle fiber. 2. What is the fatty sheath around the axon of a nerve that provides electrical insulation, protection, nourishment, and faster signal transmission? Soma Axon Myelin Dendrite 3. Research demonstrates that a load of approximately what percentage of maximum, when lifted explosively, can recruit all the motor units? 15% 33% 65% 70% 4. The term proximal refers to a position above a reference point. below a reference point. closer to a reference point. farther from a reference point. 5. An isometric action occurs when the pulling force is less than the resistance force, and the muscle lengthens. equals the opposing force, and the muscle's length increases. equals the opposing force, and the muscle's length remains constant. is greater than the force applied by resistance in the opposite direction. 6. After a bout of high-intensity resistance exercise, muscle protein breakdown is increased for approximately how long? 30 minutes 60 minutes 2 hours 4 hours
Madhur L.
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