1. Describe the structure of a muscle, including the following terms: myosin, actin, sarcomere, myofibril, fiber,...
1. Describe the structure of a muscle, including the following terms: myosin, actin, sarcomere, myofibril, fiber, bundle.
Homework Answers
Myofilaments are organised structure in muscle cell that contain actin and myosin. The organized globular proteins of actin in muscle cells form a thin filament and bundles of over 200 myosin proteins form a thick filament.
Cardiac and skeletal muscle are striated contains Sarcomere packed into highly regular arrangements of bundles. Myofibrils of smooth muscle cells are not arranged in Sarcomeres and so are not striated. Muscle fibers are cylindrical and have more than one nucleus.
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1. Describe the structure of a muscle,
including the following terms: myosin, actin, sarcomere, myofibril,
fiber,...
Label the image of a skeletal muscle fiber below. Actin Muscle fascicle Muscle fiber Muscle (organ)...
Label the image of a skeletal muscle fiber below. Actin Muscle fascicle Muscle fiber Muscle (organ) Myosin Myofibril Sarcomere
Muscle contraction: Select one O a occurs when myosin pulls on actin and the sarcomere shortens...
Muscle contraction: Select one O a occurs when myosin pulls on actin and the sarcomere shortens b. occurs when actin pushes on myosin and the sarcomere elongates O c occurs when the myosin tail splits the actin filament in half Od occurs when actin and myosin entangle, generating more distance between Z lines
Identify the muscle structure indicated with each number and match it to the appropriate label in...
Identify the muscle structure indicated with each number and match it to the appropriate label in the table. Label Muscle Structure Bone Endomysium Epimysium Fascicle Muscle Muscle fiber Myofibril Nuclei Perimysium Tendon Cross-section Endomysium Blood vessel Muscle fiber Epimysium Perimysium Identify the muscle cell structures indicated with each number and match it to the appropriate label in the table. Then check your answers. Number Muscle structure Myofibril Opening into T-tubule Plasmalemma Sarcoplasms Sarcoplasmic reticulum Transverse tubules Identify the sarcomere structure...
What are the positions of actin and myosin molecules in the sarcomere before and during the...
What are the positions of actin and myosin molecules in the sarcomere before and during the muscle contraction?
Chapters 6-8: Muscle and Neuromuscular Junction 1 Myofibrils A Excitatory transmitter that excites muscle fiber membrane...
Chapters 6-8: Muscle and Neuromuscular Junction 1 Myofibrils A Excitatory transmitter that excites muscle fiber membrane 2 Titin B Required to cause smooth muscle relaxation 3 Actin filaments C Thousands grouped together to form the muscle fiber 4 Tropomyosin D Nerve fiber sympase at muscle fiber 5 Sarcomere E Block active sites on actin filaments to block myosin attraction Acetylcholine F activates myosin cross-bridges in smooth muscle 7 Neuromuscular junction G Muscle sections between Z discs that individually contract 8...
2. Muscle contraction involves the "pulling" of actin filaments by myosin II heads of a bipolar...
2. Muscle contraction involves the "pulling" of actin filaments by myosin II heads of a bipolar filament in sarcomeres. Would it be possible for myosin II heads to induce muscle relaxation (sarcomere lengthening) instead? Why or why not? (12.5 points) ANSWER:
How would muscle contractions be affected if ATP was completely depleted in a muscle fiber? a)Myosin...
How would muscle contractions be affected if ATP was completely depleted in a muscle fiber? a)Myosin heads will detach rapidly from the actin-binding sites, resulting in muscle relaxation. In a live person this causes rigor mortis, while in a recently dead person it results in “writer’s cramp”. b)Myosin heads will not detach from the actin-binding sites, resulting in muscle stiffness. In a live person this causes rigor mortis, while in a recently dead person it results in “writer’s cramp”. c)Myosin...
1) You are investigating the force generated by the sarcomeres in a myofibril of a muscle....
1) You are investigating the force generated by the sarcomeres in a myofibril of a muscle. Let's assume you have a way of quantifying the number of actin-myosin cross bridges. You notice that for all of your sarcomeres, increasing the number of actin-myosin crossbridges does not increase the force generated by the sarcomere. What is going on? A) The sarcomeres are too contracted, hence sarcomere length is a limiting factor for force generated rather than the number of cross-bridges...
236 UNIT 12 introduction to Muscularsstern MusceTissue 2. Match each of the following terms with its...
236 UNIT 12 introduction to Muscularsstern MusceTissue 2. Match each of the following terms with its description/function: transverse tubule l. connective tissue wrapping around a muscle fiber sarcoplasmic reticulum 2. organelle packed with myofilaments epimysium transverse tubule and its flanking terminalcisternae d. thin filament 4 invagination of the sarcolemma 5. connective tissue wrapping around fascicle myofibril 6. the region of sarcolemma across from the axon terminal f triad at the neuromuscular junction endomysium 7. consists of actin, troponin, and tropomyosin...
1. (2 points) If you were given a microscope slide with an unknown type of muscle...
1. (2 points) If you were given a microscope slide with an unknown type of muscle tissue, what features would you look for to determine whether the tissue was smooth muscle or skeletal muscle? Give 2 characteristics that would allow you to distinguish between these tissue types. Be sure to state which type of muscle has the characteristics you describe.) 2. Give 3 examples of different types of connective tissues found within the body and briefly note one function of...
Label the image of a skeletal muscle fiber below. Actin Muscle fascicle Muscle fiber Muscle (organ) Myosin Myofibril Sarcomere
Muscle contraction: Select one O a occurs when myosin pulls on actin and the sarcomere shortens b. occurs when actin pushes on myosin and the sarcomere elongates O c occurs when the myosin tail splits the actin filament in half Od occurs when actin and myosin entangle, generating more distance between Z lines
Identify the muscle structure indicated with each number and match it to the appropriate label in the table. Label Muscle Structure Bone Endomysium Epimysium Fascicle Muscle Muscle fiber Myofibril Nuclei Perimysium Tendon Cross-section Endomysium Blood vessel Muscle fiber Epimysium Perimysium Identify the muscle cell structures indicated with each number and match it to the appropriate label in the table. Then check your answers. Number Muscle structure Myofibril Opening into T-tubule Plasmalemma Sarcoplasms Sarcoplasmic reticulum Transverse tubules Identify the sarcomere structure...
Chapters 6-8: Muscle and Neuromuscular Junction 1 Myofibrils A Excitatory transmitter that excites muscle fiber membrane 2 Titin B Required to cause smooth muscle relaxation 3 Actin filaments C Thousands grouped together to form the muscle fiber 4 Tropomyosin D Nerve fiber sympase at muscle fiber 5 Sarcomere E Block active sites on actin filaments to block myosin attraction Acetylcholine F activates myosin cross-bridges in smooth muscle 7 Neuromuscular junction G Muscle sections between Z discs that individually contract 8...
2. Muscle contraction involves the "pulling" of actin filaments by myosin II heads of a bipolar filament in sarcomeres. Would it be possible for myosin II heads to induce muscle relaxation (sarcomere lengthening) instead? Why or why not? (12.5 points) ANSWER:
236 UNIT 12 introduction to Muscularsstern MusceTissue 2. Match each of the following terms with its description/function: transverse tubule l. connective tissue wrapping around a muscle fiber sarcoplasmic reticulum 2. organelle packed with myofilaments epimysium transverse tubule and its flanking terminalcisternae d. thin filament 4 invagination of the sarcolemma 5. connective tissue wrapping around fascicle myofibril 6. the region of sarcolemma across from the axon terminal f triad at the neuromuscular junction endomysium 7. consists of actin, troponin, and tropomyosin...
1. (2 points) If you were given a microscope slide with an unknown type of muscle tissue, what features would you look for to determine whether the tissue was smooth muscle or skeletal muscle? Give 2 characteristics that would allow you to distinguish between these tissue types. Be sure to state which type of muscle has the characteristics you describe.) 2. Give 3 examples of different types of connective tissues found within the body and briefly note one function of...
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