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The Muscular System Three types of Muscle •Cardiac •Smooth •Skeletal Cardiac Muscle • Cardiac muscles are those that make up the heart. Though similar to striated in appearance, cardiac are also involuntary. They work together to pump blood to and from the heart and throughout the body. Smooth Muscle • Smooth – Smooth muscles are known as involuntary or visceral muscles, and are controlled by the autonomic nervous system. Lines your intestinal walls and aids in digestion Skeletal Muscle • Skeletal- skeletal muscles, are those the body has conscious control of. These include those in the face and those that move all the bones of the body. Striated muscles are made of light and dark bands called fibrils. They are the ones typically injured in sports or during physical activity Voluntary vs Involuntary Muscle Contraction • A Voluntary muscle contraction is a contraction that you have control over your body. • Body movements • Involuntary muscle contraction is a contraction that is triggered by the nervous system in which you have no control. • Digestion How many muscles are in the human body ? 640 FAST TWITCH vs SLOW TWITCH MUSCLE • Slow Twitch (Type I) The slow muscles are more efficient at using oxygen to generate more fuel (known as ATP) for continuous, extended muscle contractions over a long time. They fire more slowly than fast twitch fibers and can go for a long time before they fatigue. • So Which type of athlete would benefit from slow twitch muscle fibers ? A) marathon Runner B) Soccer Forward ANSWER : A Fast Twitch (Type II) • Because fast twitch fibers use anaerobic metabolism to create fuel, they are much better at generating short bursts of strength or speed than slow muscles. However, they fatigue more quickly. • Fast twitch fibers generally produce the same amount of force per contraction as slow muscles, but they get their name because they are able to fire more rapidly. • So Which Athlete will benefit from fast twitch muscle fibers? A) A defensive line man B) A 400 sprinter Answer: B WHAT IS THE KREBS CYCLE ? • The Krebs cycle (or citric acid cycle) is a part of cellular respiration. Named after Hans Krebs, it is a series of chemical reactions used by all aerobic organisms to generate energy. Its importance to many biochemical pathways suggests that it was one of the earliest parts of cellular metabolism to evolve.[1] • The Krebs cycle comes after the link reaction and provides the hydrogen and electrons needed for the electron transport chain. It takes place inside mitochondria. • -http://simple.wikipedia.org/wiki/Krebs_cycle What does it look like and how does this tie into muscle contraction ? • With out this cycle you would not contract …its really important When it all comes together • steps of a muscle contraction Test yourself With a check in • Complete the check-in to see your progress from January