Concept explainers
(a)
To determine: The width of the A band if a muscle is contracted and shortened.
Concept introduction: Myofilaments within the myofibrils are organized in a continuous manner with cylindrical units called sarcomeres. Inside the skeletal muscle fibers, there are several repeating sarcomeres arranged within a section of myofibril. Overlapping of thick and thin filaments constitutes each sarcomere.
(b)
To determine: The width of the H zone if a muscle is contracted and shortened.
Concept introduction: Myofilaments within the myofibrils are organized in a continuous manner with cylindrical units called sarcomeres. Inside the skeletal muscle fibers, there are several repeating sarcomeres arranged within a section of myofibril. Overlapping of thick and thin filaments constitutes each sarcomere.
(c)
To determine: The relationship of the Z disks if a muscle is contracted and shortened.
Concept introduction: Myofilaments within the myofibrils are organized in a continuous manner with cylindrical units called sarcomeres. Inside the skeletal muscle fibers, there are several repeating sarcomeres arranged within a section of a myofibril. Overlapping of thick and thin filaments constitutes each sarcomere.
(d)
To determine: The width of the I band if a muscle is contracted.
Concept introduction: Myofilaments within the myofibrils are organized in a continuous manner with cylindrical units called sarcomeres. Inside the skeletal muscle fibers, there are several repeating sarcomeres arranged within a section of myofibril. Overlapping of thick and thin filaments constitutes each sarcomere.
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