1 / 10

Muscle Function and Metabolism

Muscle Function and Metabolism. Adenosine Triphosphate (ATP). ATP is the source of energy for muscle contraction. Muscles store a very limited amount of ATP ( 4-6 sec. worth at most ). ATP must be regenerated if contraction is to continue ATP can be generated by one of three pathways….

raanan
Download Presentation

Muscle Function and Metabolism

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Muscle Function and Metabolism

  2. Adenosine Triphosphate (ATP) • ATP is the source of energy for muscle contraction. • Muscles store a very limited amount of ATP (4-6 sec. worth at most). • ATP must be regenerated if contraction is to continue • ATP can be generated by one of three pathways….

  3. Aerobic Metabolism/Cellular Respiration • Description: • Occurs in mitochondria, requires oxygen, and involves a complex sequence of chemical reactions. 2. Chemical Formula: Glucose + oxygen carbon dioxide + water+ energy (36 ATP) 3. When this system is used: • Used during prolonged, endurance activities which maintain a constant heart rate • As long as there is enough oxygen available relative to ATP demand, a muscle will utilize aerobic metabolism. • Posture, most daily movements, marathon runs, bike riding

  4. Anaerobic Metabolism/Glycolysis • Description: • When muscles contract vigorously, the bulging muscles compress blood vessels within, impairing oxygen delivery. • This pathway can occur in the absence of oxygen. 2. Chemical Formula: Glucose  lactic acid +energy (2 ATP) 3. When this system is used: • When large amounts of ATP relative to available O2are needed. Usually for exercise about 30-40 seconds long. • Tennis, soccer, 100 meter swim

  5. Anaerobic Metabolism/Creatine Pathway • Description: • Utilizes the molecule creatine phosphate to regenerate ATP, after stored ATP is depleted. 2. Chemical Formula: Creatinephosphate + ADP Creatine+ ATP (1 ATP) 3. When this system is used: • Moblized at the beginning of exercise, before other pathways ‘kick in’. • Creates enough energy for about 15 seconds of contraction. • 100 meter dash, weightlifting

  6. Summary of Muscle Metabolism

  7. Fast Twitch vs. Slow Twitch MusclesSprinter vs. Marthoner

  8. Slow Twitch/Fast Twitch Analogy: birds White meat-fast twitch, found in breast and wings, used for flying-quick movements. Dark meat-slow twitch, found in legs, used for walking.

  9. Muscle Fatigue Definition: the state of physiological inability to contract Causes: 1. Occurs when ATP production fails to keep up with ATP use. • Deficiency of ATP, as opposed to total absence of ATP which leads to a continuous state of contraction (rigor mortis, writers cramp) 2. Accumulation of lactic acid and ionic imbalances also contribute. • decreases muscle pH • causes burning sensation • interferes with actin/myosin binding

  10. Muscle conditions • Muscle cramps- (charley horse)sudden involuntary contraction of muscles due to injury, deficiency in calcium or phosphate, lack of blood flow, nerve tissue damage or dehydration. • Muscle twitches -often cause by a single nerve, due to fatigue, lack of water, stress and anxiety. • ALS-Lou Gehrig’s disease-damages motor neurons, leads to loss of movement. • Muscular dystrophy-skeletal muscle progressively weaken.

More Related