Muscle Activity: Name:_______________________________________Use your text/lab manual/online resources to answer these questions.Neuromuscular junction (NMJ)—where the motor neurons direct conscious movement, and reflex movement:What is the motor end plate?What is acetylcholine (ACh)? What does it do?What is the role of calcium at the NMJ, and in the sarcomere?Know these terms and how they relate to muscle contraction:Neuromuscular junction (NMJ)SarcomereMyosin (a myofilament)Actin (a myofilament)TropomyosinTroponinATP & calciumWhat is a “cross-bridge”? (Does the power stroke of one cross-bridge produce the contraction of an entire muscle?Briefly describe why contraction of the muscle cell is called “sliding filament theory” (what is sliding?) and what do we mean by “excitation-contraction coupling?” (What is being excited, and what is coupled?)If we need ATP for both contraction and relaxation, how would you explain why rigor mortis appears in a dead person, but then goes away?Sketch a sarcomere, and label thin and thick filaments, Z discs, titin (elastic filaments), M line, H zone, I bands, and A band.Draw a simple sketch showing a relaxed sarcomere, and one that is contracted.When a sarcomere contracts, are the filaments shortening, or is overlap of the filaments occurring?
Musculoskeletal System
The musculoskeletal system, also called the locomotor system, is an organ system that gives humans and animals the ability to move using their muscular and skeletal systems. It provides stability, form, support, and movement to the body. The skeleton is composed of bones (skeleton), muscles, cartilage, tendons, ligaments, joints, and other connective tissue that supports and binds tissues and organs together. The musculoskeletal system is subdivided into two broad systems, such as the muscular system and the skeletal system.
Skeletal structure
The skeletal system is the core framework of the human body. The skeletal structure comprises bones and connective tissue, including cartilage, ligaments, and tendons. The skeletal structure of our body acts as a support structure. It maintains the body's shape and is responsible for its movement, blood cell formation, protection of organs, and mineral storage. The skeletal system is referred to as the musculoskeletal system.
Muscle Activity: Name:_______________________________________
Use your text/lab manual/online
Neuromuscular junction (NMJ)—where the motor neurons direct conscious movement, and reflex movement:
What is the motor end plate?
What is acetylcholine (ACh)? What does it do?
What is the role of calcium at the NMJ, and in the sarcomere?
Know these terms and how they relate to muscle contraction:
Neuromuscular junction (NMJ)
Sarcomere
Myosin (a myofilament)
Actin (a myofilament)
Tropomyosin
Troponin
ATP & calcium
What is a “cross-bridge”? (Does the power stroke of one cross-bridge produce the contraction of an entire muscle?
Briefly describe why contraction of the muscle cell is called “sliding filament theory” (what is sliding?) and what do we mean by “excitation-contraction coupling?” (What is being excited, and what is coupled?)
If we need ATP for both contraction and relaxation, how would you explain why rigor mortis appears in a dead person, but then goes away?
Sketch a sarcomere, and label thin and thick filaments, Z discs, titin (elastic filaments), M line, H zone, I bands, and A band.
Draw a simple sketch showing a relaxed sarcomere, and one that is contracted.
When a sarcomere contracts, are the filaments shortening, or is overlap of the filaments occurring?
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