Anaerobic respiration by yeast – fermentation

The video explains why muscles feel stiff after exercise, focusing on the role of lactic acid. It begins with an experiment to demonstrate muscle fatigue and discusses the differences between aerobic and anaerobic respiration. Anaerobic respiration occurs when muscles lack oxygen, producing lactic acid, which causes pain and stiffness. The video explains the concept of oxygen debt and the need for oxygen to break down lactic acid in the liver. It concludes with the importance of warming down to prevent stiffness.

What is the purpose of the initial experiment involving the arm?

• To assess endurance

• To test flexibility

• To demonstrate muscle contraction

• To measure arm strength

Why can't muscles rely solely on anaerobic respiration?

• It requires too much oxygen

• It produces more energy than needed

• It generates lactic acid as a waste product

• It is faster than aerobic respiration

What happens to lactic acid after you stop exercising?

• It travels to the liver to be broken down

• It is converted into energy

• It remains in the muscles indefinitely

• It evaporates through the skin

What is the term used to describe the need for extra oxygen after anaerobic exercise?

• Oxygen reserve

• Oxygen deficiency

• Oxygen debt

• Oxygen surplus

Why is it important to cool down after exercising?

• To improve flexibility

• To prevent lactic acid buildup

• To increase heart rate

• To enhance muscle growth