Aerobic vs. Anaerobic metabolism

1. Two major energy systems function in muscle tissue:... and aerobic metabolism. 2. Each of these systems... ATP. 3. During sudden outbursts of activity in intensive, short-term exercise, ATP can be rapidly... to meet energy needs. 4. After a few seconds of intensive exercise, however, the... stores of ATP are used up. 5. The body then turns to... as an energy source. 6. Glycogen can be metabolized within … …. … to generate ATP for muscle contractions. 7. ATP and muscle glycogen can be metabolized... the need for oxygen. 8. Thus this energy system involves anaerobic metabolism (occurring in the absence of oxygen). 9. As exercise continues, the body has to... on the metabolism of carbohydrates (more specifically, glucose) and fats to generate ATP. 10. The second energy system requires oxygen and is therefore...... as aerobic metabolism (occurring in the presence of oxygen). 11. In most activities aerobic and anaerobic systems function.... 12. The degree to which the two major energy systems are involved is determined by the......... of the activity. 13. If the intensity of the activity is such that sufficient oxygen can be supplied to......... of working tissues, the activity is considered to be aerobic. 14. Conversely, if the activity is of high enough intensity and the duration is such that there is insufficient oxygen available to meet... demands, the activity becomes anaerobic. 15.As the intensity of the exercise increases and insufficient amounts of oxygen are available to the tissues,...... is formed. 16. Consequently, an oxygen debt is incurred that must be paid back during the... period. 17. Lactic acid is metabolized...... this oxygen deficit. 18. For example, short bursts of muscle contraction, such as in... or swimming sprints, use predominantly the anaerobic system. 19. However, endurance events depend a great deal on the aerobic.... 20. Most sports use a... of anaerobic and aerobic metabolism.

5.11. Act out a conversation.