L11 - Physiology PDF Notes

L11 - Physiology PDF Notes - Three muscle types are found:...

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Three muscle types are found: ( i ) skeletal muscle, ( ii ) cardiac muscle, and ( iii ) smooth muscle. Skeletal muscles make up approximately 40% of total body weight. Cardiac muscle is found only in the heart, where it helps the heart function as a pulsatile pump, which ensures the movement of blood through the vasculature. Smooth muscle is predominantly found in the internal organs and tubular structures such as in walls of the gastrointestinal tract, urinary bladder, uterus, and blood vessels (but not in the walls of capillaries). The muscles in the body have two important functions: ( i ) to generate force; and ( ii ) to generate motion. A third function of muscle cells (particularly skeletal muscle) is to generate heat through multiple contractions (referred to as shivering thermogenesis ). Muscles perform these functions by converting the chemical enrgy stored in the high-energy phosphate bonds of ATP to either mechanical energy (force generation or movement) or heat (shivering thermogenesis). It is important to mention at the outset that although shortening is a hallmark of muscle function and results from
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L11 - Physiology PDF Notes - Three muscle types are found:...

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