Column I Column II Ca binds to calmodulin 1. Elastic fibers that anchor thick filaments in place Ca binds to troponin 2. Occurs in smooth muscles only Oxidative type I muscle fibers 3. Is the primary source of Ca that drives muscle contraction
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The muscular system is a system of muscles of all kinds- skeletal, smooth and cardiac. These muscles help in maintaining body posture, enable movement and also protect us against foreign material.
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- Ans Column I Column II Ca binds to calmodulin 1. Elastic fibers that anchor thick filanments in place Ca binds to troponin 2. Occurs in smooth muscles only Oxidative type I muscle fibers 3. Is the primary source of Ca that drives muscle contraction Titin 4. Is a dense connective tissue that surrounds the entire muscle H zone 5. Anchors thin filaments together Z line 6. Have high concentration of mitochondria Sarcomere 7. The region of thick filaments that has no overlap with thin filaments Actin and myosin 8. Is the functional unit of skeletal muscle Epimysium 9. Occurs in skeletal and cardiac muscles Sarcoplasmic reticulum 10. Generate the mechanical force of a muscle through crossbridge cyclingAns Column I Column II Ca binds to calmodulin 1. Elastic fibers that anchor thick filaments in place Ca binds to troponin 2. Occurs in smooth muscles only Oxidative type I muscle fibers 3. Is the primary source of Ca that drives muscle contraction Titin 4. Is a dense connective tissue that surrounds the entire muscle H zone 5. Anchors thin filaments together Z line 6. Have high concentration of mitochondria Sarcomere 7. The region of thick filaments that has no overlap with thin filaments Actin and myosin 8. Is the functional unit of skeletal muscle Epimysium 9. Occurs in skeletal and cardiac muscles Sarcoplasmic reticulum 10. Generate the mechanical force of a muscle through crossbridge cycling Matching between Column I and corresponding definition or function in column II ?Calcium binding to calmodulin causes phosphorylation of what protein in what type of muscle? I Otroponin in skeletal and cardiac muscle only troponin in smooth muscle only actin in cardiac and smooth muscle actin in smooth muscle only myosin in smooth muscle only
- Write note on the circled events of the excitation contraction coupling shown in the diagram below. Sarcolemma T-tubule Myosin Ca++ 4 Ca Cat 3 TN-I 2 TN-C -TN-T SR DHP receptor Actin TM SERCA RyR RK '17The endplate potential decreases with distance because too spread Na* channels the muscle membrane is too thin the leakiness of the muscle fiber the accumulation of voltage-gated channels none of the aboveChapter 13, Level 2: Which of the following is true of a muscle spindle? O it is a region where sensory and motor neurons synapse in a monosynaptic reflex arc O it is a structure within a skeletal muscle that can monitor the stretch and position of that skeletal muscle O it is the portion of a skeletal muscle that antagonizes the contraction of that skeletal muscle O it is the structure that connects a skeletal muscle to a bone
- Select ALL that could cause muscle cramping (a sustained muscle contraction) in skeletal muscle: OHyperexcitability of somatic motor neurons (secreting too much Ach) Botulism poisoning, which prevents Ach secretion from somatic motor neurons O Myasthenia Gravis, in which antibodies block Ach receptors at the motor end plate, preventing Ach from binding O Hypocalcemia, in which the calcium pumps of the sarcoplasmic reticulum are unable to keep Ca2+ inside the SR (allowing Ca2+ to leak into the cytoplasm)In the given below option what step causes a sarcomere to shorten? cross-bridge formation calcium transport into SR calcium release power stroke myosin heads in high energy stateDuring sarcomere shortening myosin gets shorter actin gets shorter A-band gets shorter • H-zone gets shorter more than one of the above is correct
- The relaxation of skeletal muscle relies on the activity of the _ which decreases cytoplasmic calcium ion concentration. acetylcholine receptor Ca2+ -ATPase pump ryanodine receptor Na*/K* ATPase pumpArrange 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 > |> > > |> > > > > > > > >The mechanism of contraction in smooth muscle is different from skeletal muscle in that the site of calcium binding differs ATP energizes the sliding process actin and myosin interact by the sliding filament mechanism the trigger for contraction is a rise in intracellular calcium the thick filaments have fewer myosin heads