vb.net qr code generator Fig 145 The internal anatomy of a skeletal muscle in .NET framework

Creator ANSI/AIM Code 128 in .NET framework Fig 145 The internal anatomy of a skeletal muscle

Fig 145 The internal anatomy of a skeletal muscle
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STRUCTURES WITHIN THE MUSCLE FIBERS
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An important question for us to ask is, Okay, but so far we haven t learned how the internal anatomy of a skeletal muscle explains how it contracts (shortens) and provides the pulling force for body movements
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PART 4 Anatomy and Physiology of Animals
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Ultimately, the answer to this question will require us to examine the inner anatomy of an individual skeletal muscle ber, which is actually a long, bershaped cell As Figure 146 reveals, the striated (cross-striped) muscle cell or ber contains numerous myo brils (my-uh-FEYE-brils) The word myo bril literally means little ber ( bril) of a muscle (my) Each of these myo brils is actually a slender, ber-shaped, cell organelle The myo brils have a dark-and-light banding pattern The dark bands are called the A bands, while the light bands are called the I bands The striations (stry-AY-shuns) or crossstripes of each muscle ber, then, in reality just represent the dark A bands of their myo brils, stacked one upon the other to make a stripe Within the middle of each light I band is a dark, zig-zagging Z-line These dark lines mark o a series of sarcomeres (SAR-koh-meers) A sarcomere is a short segment (-mere) of esh (sarc): that is, a region of myo bril between two Z-lines Hence, each myo bril organelle within a muscle ber basically consists of a series of sarcomeres, attached end-to-end
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Striation Z-line
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I band A MUSCLE FIBER (CELL)
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Fig 146
A look within a muscle ber (cell)
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Whether one is considering the contraction of muscles in humans, sh, amphibians, reptiles, birds, or practically any other vertebrate animals, the
CHAPTER 14 Neuromuscular Connection
general mechanism of shortening is much the same To understand its basic features, we must examine the interior of a sarcomere (Figure 147) Within the sarcomere are a number of myo laments (my-oh-FIL-ah-ments) or muscle threads In reality, these myo laments are thread-like collections of protein molecules Attached to the Z-line at either end of the sarcomere are a series of thin actin (AK-tin) myo laments Each of these thin actin myo laments consists of two twisted strands of globe-shaped actin proteins [Study suggestion: Find a beaded pearl necklace and lay it upon a surface Place both strands of the necklace side-by-side, then twist them around each other The resulting double helix (two twisted strands) provides a rough model for a thin actin myo lament] In the middle of each sarcomere is a series of thick myosin (MY-oh-sin) myo laments These are stacked vertically above-and-below one another, with narrow gaps between them Each myosin myo lament consists of dozens of individual myosin protein molecules Each myosin protein somewhat resembles a golf club with two heads The double-heads are tiltable, as if they were poised upon a chemical hinge The tiltable double-head of each myosin molecule is technically called a myosin cross-bridge [Study suggestion: Visualize two golfers, each carrying their own bag of golf clubs Each club has a double-head at one end, which is attached by a tiltable hinge The two golfers stand back-to-back, in the center of a sarcomere, and then each gives his golf bag a heave If the golfers keep hold of their bags, their clubs will come ying out in both directions, some with their double-heads pointing upward, and some with their double-heads pointing down The resulting highly orderly arrangement provides a rough model for the thick myosin myo lament] The myosin cross-bridge is the chief contact point between the thin actin and thick myosin myo laments It is also vitally important because of its close functional relationship with the high-energy ATP molecule You may remember ( 4) that the ATP molecule is split by a special kind of enzyme, called ATPase In the case of muscle, the enzyme is myosin ATPase
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