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Equine Muscular System objectives Label a diagram of the muscles of the horse List and describe the three types of muscle Discuss the ways muscles are fueled in the horse Draw and label a tendon and its parts Muscle system Provides movement Externally Internally Each muscle supplied by one or more nerves that provide impulse to move Transmits back to brain when motion is completed Fueling the muscles Phosphagen system Short burst – up to 30 seconds Anerobic Uses energy stored in muscle cells Glycogen or lactate system Up to 5 minutes of activity Takes over when the phosphagen system is depleted from Anerobic Krebs cycle Aerobic – requires oxygen Produces the largest amount of ATP Can be sustained – as long as adequate oxygen is supplied Fueled by pyruvic acid derived from glycolosis or fatty acids from adipose (fat) tissue or absorbed from diet. Smooth muscle Smooth (involuntary) Called visceral muscle Found primarily in the digestive system and uterus Capable of long periods of activity without fatigue Intestinal muscle moves in waves Peristalsis Cardiac muscle Found only in the heart Movement is inherent and rhythmic Requires no nerve stimulus Only split seconds of rest between contraction Skeletal muscle (striated) Usually attached to bone by tendons and ligaments Under direct control of the will Usually arranged in sets – one bends the joint, one straightens the joint Flexor - bends Extensor – straightens Striated muscle is a series of long cells arranged side by side When it receives signal – contracts Do not act oppositional to each other, act successively Tendons Major muscles of the horse
