Wiki User
∙ 12y agofusiform
Wiki User
∙ 12y agoWhen skeletal (or cardiac) muscle contracts, the thin and thick filaments in each sarcomereslide along each other without their shortening, thickening, or folding.
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.
A sarcomere is the basic contractile unit of a muscle fiber, consisting of overlapping actin and myosin filaments. It is responsible for muscle contraction by shortening in response to nerve stimulation.
When skeletal (or cardiac) muscle contracts, the thin and thick filaments in each sarcomereslide along each other without their shortening, thickening, or folding.
Contraction or relaxation of muscle fibre, due to similar effect in sarcomere
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.
Round Worms.
A prism, curved and tapered to a point at each end.
Help
The name given to contracting units of muscle fibers is sarcomeres. Sarcomeres are the basic functional units of skeletal muscles and they contain overlapping thick and thin filaments that slide past each other during muscle contraction.
Many small canneries in Alaska and Canada do not manufacture their own cans. Tapered cans are stacked inside each other to save space when shipping to the cannery.
I just tapered three of my jeans today and each cost US$20