1 Muscle copy - MUSCLE PHYSIOLOGY Example of a perfectly...

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MUSCLE PHYSIOLOGY
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Example of a perfectly formed human being with regard to musculature! :-)
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Muscle Function Definition - An organ whose function is mediating motion. How does muscle provide motion? - Muscle has the ability to shorten. (Cannot lengthen) Eg. - When attached to bones, muscle can cause limbs to move.
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Types of Muscle Skeletal Muscle - Striated in microscope rovides willful voluntary limb motion Smooth Muscle - Non-striated in microscope and provides involuntary motion such as G.I. motility, arteriolar diameter decrease, etc. Cardiac Muscle - Involuntary with characteristics between smooth and skeletal muscle.
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Three Types of Muscle
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Physiologic Basis of Muscle Shortening How do muscles shorten? - To answer this we will use the reductionist method which is to reduce muscle into progressively smaller levels of anatomic organization until finally we arrive at molecules and explain muscle shortening in terms of molecules. When we have done this we have arrived at the most fundamental explanation.
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Anatomic Level One Whole Organ - Spindle shaped organ whose function is motion. How does it provide motion? - By shortening. This is the explanation of muscle motion at the whole organ level. (Da Vinci’s explanation)
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Cellular Level Explanation After the invention of the microscope physiologists had to extend Da Vinci’s explanation of muscle motion to the cellular level. A muscle is composed of cells. Now we have to explain muscle motion in terms of cells. Do the cells shorten? . .. and if so, how?
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Muscle cells are long which is why a muscle cell is called a muscle fiber. Even though microscopic width wise their length extends to the entire length of the organ usually.
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This note was uploaded on 04/30/2011 for the course ANATOMY 3504 taught by Professor Steffens during the Spring '11 term at St. John's.

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1 Muscle copy - MUSCLE PHYSIOLOGY Example of a perfectly...

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