4.  Very important during times of limited oxygen availability  Only occur for a short period of time (2-3 minutes)  Some lactic acid can diffuse out of the cell; the rest can cause short-term (a day or two) muscle pain  Anaerobic respiration is limited by depletion of glucose and buildup of lactic acid

5.  During resting activities & long term exercise (long distance running) fatty acids are used primarily for ATP production

7.  After a person dies ATP is not available, the cross bridges that are formed are not released, causing the muscle to become rigid.

8. 3 phases to muscle twitch 1. Lag Phase 2. Contraction Phase 3. Relaxation Phase

11.  Results when ATP is used faster than can be produced and lactic acid builds up faster than can be removed  ATP levels can fall too low for muscle cells to produce the maximum force of contraction  During extreme fatigue muscles may not be able to contract or relax; Physiological Contracture  Most common type of fatigue is psychological; perception of central nervous system

12.  After intense exercise respiration rates & volume remain elevated  Pays back oxygen debt that occurred during activity  Converts lactic acid to glucose  Replenish depleted ATP and creatine phosphate stores  Replenish oxygen stores in lungs, blood and muscles  Magnitude of oxygen debt depends on the intensity & length of time of exercise and the physical condition of the person  Exercise and training improves the ability to carry out both aerobic and anaerobic respiration

17.  Isometric  Isotonic  Concentric  Eccentric