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What occur during muscle relaxations?
Muscle tension declines, myosin releases thin filaments, and calcium levels in the sarcoplasm fall.
Why does skeletal muscle appear striated when viewed through a microscope?
Skeletal muscle appears striated due to the arrangement of the actin and myosin filaments within muscle fibers. The alternating light and dark bands represent the organization of these filaments, creating the striated pattern. This organization is essential for muscle contraction and force generation.
What events occurred during muscle relaxation?
Muscle tension declines, myosin releases thin filaments, and calcium levels in the sarcoplasm fall.
Are there more thick filaments than thin filaments in smooth muscle?
There more thin filaments than thick filaments in smooth muscle. The ratio is of the thin to thick filaments in the smooth muscle is approximately 15:1.
What protein filament is usually always ready for muscle contraction?
The structure of muscle filaments - View diagram of the structure of muscle ... These two types of filament have different structures that enable then to work together. ... Thick filaments are formed from a protein called myosin which has important ...muscle filaments cause muscles to contract,
What are the levels of organization that form the stomach?
stomach muscle cellstomach muscle tissuestomach organ
What are the levels of organization that forms the stomach?
stomach muscle cellstomach muscle tissuestomach organ
What are the 3 types of filaments within a muscle and what protein makes up each filament?
The three types of filaments within a muscle are thin filaments, thick filaments, and elastic filaments. Thin filaments are primarily composed of the protein actin, while thick filaments are made up of myosin. Elastic filaments, which help maintain the structure and elasticity of the muscle, are primarily composed of the protein titin. These filaments work together to facilitate muscle contraction and relaxation.
What levels of organization is gound-up muscle?
Levels of organization of muscle ( in decreasing order)1. Muscle: Group of muscle fascicles, which work together to cause one specific movement.2. Fascicle: Bundle of muscle fibers3. Muscle fiber: Muscle cell: cylindrical cell of skeletal muscle. It has many nuclei, therefore it is called multinucleate.4. Myfibril: Contractile fibers found within a muscle cell. It has 100 - 1000's of muscle cells in each muscle fiber.5. Sarcomere: Structural and Functional unit of the muscle. It is the smallest unit of a muscle that is able to contract.6. Actin and myosin filaments: Filamentous proteins which can interact together to cause contraction.
What are the muscle structures from largest to smallest?
The organization of a skeletal muscle from smallest to largest is as follows: myofilaments > myofibrils > muscle fiber > fascicle > muscle
Do smooth muscle have thick and thin filament?
Both do have actin and myosin.Within each skeletal muscle fiber are hundreds of lengthwise subdivisions called myofibrils.Myofibrils are made up of bundles of the protein filaments (myofilaments) that are responsible for muscle contraction: thin filaments: made of the protein actin, andthick filaments: made of the protein myosin.These are visible using a microscope.The internal organization of actin and myosin in smooth muscle is different from that in the striated muscles.Smooth muscle cells: are long and slender, are spindle shaped, with a single, central nucleus, have scattered myosin fibers, with more heads per thick filament and have actin filaments attached to dense bodies.These can not be seen using a microscope and that is why they are also called smooth muscle fibers.
What structures help to anchor the thick and thin filaments in place?
Structures that help to anchor the thick and thin filaments in place include the Z-discs (also called Z-lines or Z-bands) in skeletal muscle and the dense bodies in smooth muscle. These structures provide attachment points for the filaments and help maintain the organization and alignment of the muscle proteins during contraction.
