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Smooth muscle has spindle-shaped cells What does spindle-shaped mean?
Spindle-shaped cells have a elongated shape, with a bulging middle and tapered ends resembling a spindle used in yarn-making. This shape allows for coordinated contraction and relaxation of the muscle cell.
How does a muscle contact according to the sliding-filament model of muscle contraction?
When skeletal (or cardiac) muscle contracts, the thin and thick filaments in each sarcomereslide along each other without their shortening, thickening, or folding.
How does a muscle contract according to the sliding-filament model of muscles contraction?
When skeletal (or cardiac) muscle contracts, the thin and thick filaments in each sarcomereslide along each other without their shortening, thickening, or folding.
What happens when thin filaments in a muscles fiber slide over the thick filament?
Contraction or relaxation of muscle fibre, due to similar effect in sarcomere
A sarcomere is?
A sarcomere consists of thin and thick filaments arranged so they can slide over each other. The boundary of the sarcomere are the Z lines. Thin filaments extend from the Z lines and overlap with thick filaments in the middle of the sarcomere. The I band is on each side of the Z line where only thin filaments occur. The A band is the length of the thick filaments and is divided into three parts; the zone of overlap is on each end where thin and thick filaments occur, the H band is in the middle and has only thick filaments, and the M line is the center of the A band.
The end of the muscle that moves when a muscle contracts?
Histological PerspectiveBoth ends of the muscle are pulled together. This is because each muscle fiber is divided into contractile units called sarcomeres. Each sarcomere is composed of layers of thin and thick filaments, Actin and Myosinrespectively. The thick filaments, myosin, are located in the center of the sarcomere, a region called the A-Band. On either side of each A-Band, is a region called the I-Band. The I-Band is primarily composed of the thin filaments (Actin), although the thin filaments do overlap with the thick filaments within a sub region of the A-band called the zone of overlap.As the muscle contracts the thick filaments pull the thin filaments together on either side, resulting in the apparent contraction of the muscle on both sides.Gross Anatomical Perspective.However, because a muscle is anchored at the origin of the stationary bone while its other end attaches at the insertion of the articulating bone and the net force of the contracting muscle pulls the insertion of the muscle to its origin.It follows that: The correct answer is toward the origin.
What are worms called that are smooth and tapered at each end?
Round Worms.
What are the two contractile proteins of muscle?
The two contractile proteins of muscle are actin and myosin. Actin is a thin filament, while myosin is a thick filament. They interact with each other to generate the force required for muscle contraction.
What is the name of a 3 sided solid?
A prism, curved and tapered to a point at each end.
What sea animal has a long tapered body and tail fin on each side?
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How are proteins organized in sarcomere?
Proteins in the sarcomere are organized into thick filaments made of myosin and thin filaments made of actin. These filaments overlap and slide past each other during muscle contraction. Other proteins like troponin and tropomyosin are also present to regulate the interaction between actin and myosin.
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.
