The maximum amount of oxygen lost from blood is in capillaries surrounding the tissues.

Glucose is converted to lactic acid during strenuous exercise.

Glycolysis is the first step in the breakdown of glucose. It occurs both in aerobic and anaerobic respiration.

Hiccups are due to the involuntary contraction of the diaphragm. Hiccups may occur individually, or they may occur in bouts. The rhythm of the hiccups, or the time between hiccups, tends to be relatively constant. 

Krebs' cycle occurs in the mitochondria.

Gases diffuse over the respiratory surface because pO₂ is more in alveoli than in blood.

Prawn respires through gills.

Epiglottis prevents the entry of food in wind pipe.

At high altitudes, the RBCs in human blood increase in number to meet the increased oxygen demand.

Cutaneous respiration (through the skin) is performed by a frog during hibernation.