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Biology 7.6

Biology- Bones and Muscles Chapter 7 Section 6 -Finished

QuestionAnswer
fascia a tough, translucent sheath that the entire biceps muscle is encased in
tendons at both ends of the muscle the fascia tapers into a strong thing that fasten the biceps to the scapula above and to the radius below
muscle fibers millions of individual muscle cells that compose a muscle
myofibrils long cylinders which extend the length of the muscle cell which the contraction machinery itself is found in
sacomeres millions of overlapping fibers arranged in repeating units which give skeletal muscles their striated appearance, and they compose myofibrils
neuromuscular junction the point at which a motor nerve connects to a muscle cell
motor untit a group of muscle cells connected to a single motor neuron
all-or-none principle when a muscle fiber is stimulated to contract it does so completely and then relaxes completely until another nerve impulse reaches it
why does the number of muscle fibers in a motor unit vary muscles that must produce movements of great precision have fewer muscle cells per motor unit allowing very fine control, and muscles designed for coarser movements have many more muscle cells in each motor unit
how does the structure of muscle fibers and the process of muscle contraction both support the idea that the human body did not come into being by a series of genetic mistakes but rather by a Creator muscle fibers-they are so complex that there is no way that they were made by genetic mistakes process of muscle contraction-they are timed out just perfectly and all in sink that it is crazy to think that this could have all just been a genetic mistake
how do muscle fibers contract when contracting it does so completely and then relaxes completely until another nerve impulse reaches it
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