Fast twitch muscle fibers are characterized by all of the following EXCEPT: O a) fatigue resistant Ob) direct relationship to the anaerobic energy system O c) rapid contraction O d) used in sprinting
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- Which of the following regions of a sarcomere at rest is characterized by the presence of myosin only? a) A band b) H zone c) I band d) Z line15) 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
- Acetylcholinesterase is an important molecule in the engine end plate to share: a) stimulates receptors in the postsynaptic membrane b) synthesizes acetylcholine from acetate and choline c) breaks down acetylcholine d) stimulates the release of Ca2 + from the sarcoplasmic reticulumWhich 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 increases
- What 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 ATPDescribe how each of the following factors influences motor unit recruitment: a) Increasing contraction speed b) Increasing force output c) Increasing fatigueIf 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 size
- Which of the following labeled zones in the electron micrograph of the sarcomere shortens during contraction? OA) B) -E C) 00) D E) -C -8Describe the position where wrist and finger are in full extension. What sensation will be felt in this position? What explains this sensation that you felt when the wrist and fingers were positioned in extension? *NOTE: Apply any of the following concepts to the explanation as deemed appropriate and connected to the situation above: Mucle Contraction, Concentric Contraction, Isometric Contraction, Eccentric Contraction, Force Velocity Curve, Stretch Reflex, Reciprocal Inhibition, Autogenic Inhibition, Length-Tension RelationshipWhich part of a skeletal muscle does shorten during muscular contraction? A) Thick filaments B) Thin filaments C) Z disks D) Sarcomeres