Lactic Acid System in Exercise

The video explains the lactic acid system, an anaerobic energy system using glucose as fuel. Glycolysis breaks down glucose to produce ATP and pyruvic acid, which converts to lactic acid in the absence of oxygen, causing fatigue. The system is effective for 1-2 minutes of high-intensity activity. Advantages include rapid energy production without oxygen, while disadvantages involve pain and low energy yield. The system is used by athletes in short-duration, high-intensity sports.

What is the primary fuel source for the lactic acid system?

• Fatty acids

• Glucose

• Proteins

• Amino acids

What is the process called when glucose is broken down to release energy?

• Glycolysis

• Oxidation

• Photosynthesis

• Fermentation

In the absence of oxygen, what does pyruvic acid convert into?

• Ethanol

• Water

• Lactic acid

• Carbon dioxide

How long is the lactic acid system effective during high-intensity exercise?

• 5-10 minutes

• 1-2 minutes

• 10-20 seconds

• 30-60 seconds

Which type of athlete is most likely to rely on the lactic acid system?

• Marathon runners

• 400-meter runners

• Sprinters

• Weightlifters

What energy system does a 400-meter runner use after the ATP-PC system is exhausted?

• Phosphagen system

• Lactic acid system

• Oxidative system

• Aerobic system

What is a key advantage of the lactic acid system?

• High energy yield

• Rapid energy production

• Long duration

• Requires oxygen

What is a major disadvantage of the lactic acid system?

• Causes pain and fatigue

• Requires oxygen

• High energy yield

• Slow energy production

How many ATP molecules are produced from one molecule of glucose in the lactic acid system?

• 4 ATP

• 2 ATP

• 6 ATP

• 8 ATP

Why is the energy yield considered low in the lactic acid system?

• It requires a lot of oxygen

• It takes a long time to produce energy

• It produces only 2 ATP per glucose molecule

• It produces a lot of waste products