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What protein makes up the thick filaments of myofibrils?
Myosin makes up the THICK filaments, and actin makes up the thin filaments of myofibrils.
What makes up a myofibril?
Myofibrils are made up of actin (thin filaments) and myosin (thick filaments).
What surrounds myofibrils?
The sarcoplasmic reticulum are the membranous interconnecting channels and sacs that surround and run parallel to the myofibrils.
What are the longitudinal in the cytoplasm of a skeletal?
Myofibrils
What shortens muscle contraction?
myofibrils
What is the smallest myfibril myofilament muscle fiber or fascicles?
The smallest unit among myofibrils, myofilaments, muscle fibers, and fascicles is the myofilament. Myofilaments are the microscopic protein filaments (actin and myosin) within myofibrils that are responsible for muscle contraction. Myofibrils are bundles of myofilaments, muscle fibers are composed of many myofibrils, and fascicles are groups of muscle fibers.
What is the contractile unit within a myofibril called?
The sarcomere is the contractile unit. It is the space between two Z discs that contains one group of myosin fillaments and two groups of actin fillaments, one group on each end of the myosin fillaments. Z discs join sarcomeres together end-to-end to form myofibrils. A group of myofibrils surrounded by the sarcolema makes up a muscle fiber.
Contractile units of skeletal muscles are?
myofibrils
Muscles contain thousands of what for energy?
myofibrils
Myofibrils are made primarily of what?
actin and myosin
What are the longitudinal bundles in the cytoplasm of skeletal?
myofibrils
Where are the myosin filaments found?
Myosin filaments are found in muscle cells, specifically in the thick filaments that make up the myofibrils within the muscle fibers. They are a key component of the sarcomeres, the functional unit of the muscle that is responsible for muscle contraction.
