MUSCLE PHYSIOLOGY

Detailed explanation-1: -Summary. Cellular respiration always begins with glycolysis, which can occur either in the absence or presence of oxygen. Cellular respiration that proceeds in the absence of oxygen is anaerobic respiration. Cellular respiration that proceeds in the presence of oxygen is aerobic respiration.

Detailed explanation-2: -The three stages of aerobic cellular respiration are glycolysis (an anaerobic process), the Krebs cycle, and oxidative phosphorylation.

Detailed explanation-3: -The Krebs cycle is the second stage of cellular respiration, and cellular respiration is a series of stages or biochemical pathways that produces energy for the cell. Cellular respiration begins with a pathway called glycolysis where glucose is converted into a molecule called pyruvate.

Detailed explanation-4: -Glycolysis occurs in both aerobic and anaerobic states. In aerobic conditions, pyruvate enters the citric acid cycle and undergoes oxidative phosphorylation leading to the net production of 32 ATP molecules. In anaerobic conditions, pyruvate converts to lactate through anaerobic glycolysis.