Anaerobic and Aerobic Systems Quiz

Cellular Processes

• The largest molecule to move through the cell is PCr (Phosphocreatine)

Exercise and Energy Production

• PCr levels decrease during exercise
• Glycolysis pathway starts with glucose and ends with 2 pyruvates
• Net ATP production in glycolysis is 2 ATP
• Lactate dehydrogenase (LDH) converts pyruvate into lactate

Lactate Production and Removal

• Fast twitch (FT) fiber type produces more lactate
• The main pathway for lactate removal is the liver
• Approximate concentration of lactate in the blood is 1-2 mmol/L
• Lactate dehydrogenase (LDH) is responsible for bidirectional conversion between lactate and pyruvate
• Main reason for lactate production during high-intensity exercise is rapid energy demand

Energy Systems and Exercise

• Short high-intensity workouts affect the ATP-PC system
• Long duration with lower intensity exercises affect the Oxidative system

Phosphocreatine and Creatine Kinase

• Main source of PCr in the body is skeletal muscles
• Creatine Kinase's role is to catalyze the reversible reaction between PCr and ATP
• Cytosolic isoform of Creatine Kinase is located in the cytosol
• Main function of the Creatine-phosphate shuttle is to transport energy from mitochondria to myofibrils
• Direction of the reversible reaction catalyzed by Creatine Kinase is PCr + ADP ⇌ Cr + ATP
• Mitochondrial isoform of Creatine Kinase prefers to break down PCr
• Cytosolic isoform of Creatine Kinase prefers to make PCr
• The electron transport chain powers the cell and creates ATP in the mitochondria