Muscular strength is defined as the: O a) ability of a muscle to contract with maximal force b) ability to move the joints through a full range of motion c) ability to sustain a given level of muscular tension over time d) amount of force a muscle can produce repeatedly over 60 seconds
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- Skeletal muscle contraction is influenced by A) frequency of stimulation B) calcium release from the sarcoplasmic reticulum C) dihydropyridine receptors D) ryanodine receptors E) all of the above15) what role does calcium play in muscle contraction? a) calcium is not involved in skeletal muscle contraction b) it binds to tropomyosin and moves Tripp in away from the myosin binding sit on the actin molecules c) it's binds to Troponin and moves tropomyosin away from the actin binding sit on the myosin molecules d) it binds to troponin and moves tropomyosin away from the myosin binding site on the actin moleA motor unit is the smallest voluntary functional unit of force production and consists of one motor neuron and all the muscle fibers that it innervates. a.) True b.) False
- Which is true for striated muscles? a) may have spontaneous activity b) is not under the control of the will c) many cell nuclei, located below the membrane, in each muscle fiber.When a muscle fiber is stimulated with repeated stimuli, the contraction force is summed due to: a) an increasing number of engine units recruit b) the number of actin / myosin bonds decreases c) increased strength of the action potential in the plasma membrane d) The Ca2 + concentration around and in the myofibrils increasesWhat is the role of calcium in muscle contractions? Multiple Choice a) To spread the action potential through the T-tubules b) To bind with troponin, changing its shape so that binding sites on the actin filament are exposed c) To transmit the action potential across the neuromuscular junction d) To re-establish the polarization of the plasma's membrane following an action potential e) To break the cross-bridges as a cofactor in the hydrolysis of ATP
- If you completely stopped working out for 6 months, the following would occur: O a) a decrease in muscle fiber type O b) an increase in muscle fiber size O c) an increase in muscle fiber number O d) a decrease in muscle fiber sizeWhich part of a skeletal muscle does shorten during muscular contraction? A) Thick filaments B) Thin filaments C) Z disks D) Sarcomeres26) muscle tone is .... a) the ability of a muscle to efficiently cause skeletal movements b) the feeling of well being following exercise c) the condition of athletes after intensive training d) a state of sustained partial contraction
- Muscular endurance is defined as the: O a) ability of a muscle to contract repeatedly over an extended period of time b) amount of force a muscle can produce with a single maximal effort O c) ability to move the joints through a full range of motion O d) amount of time required to contract a muscle completely14) after a muscle fiber has contracted, the calcium a) is secreted by the Golgi apparatus b) is chemically bound to the myofilaments c) renters the sarcoplasmic reticulum d) is destroyedIf an individual does training with only the right knee extensor muscles, it is common to see increase in strength in knee extension force for the right leg and an increase in strength in the knee extension force of the left leg (although the increase in force is typically not to the same extent as the force increase in the right leg) a.) True b.) False