Where does respiration take place?

Every cell in your body. Respiration takes place when glucose are used and change to energy. There are two types of respiration. Aerobic and anaerobic
Equation for aerobic : food (glucose) + oxygen -> energy
Equation for anaerobic (due to absent of oxygen) : food (glucose) -> energy + lactate

it takes place in the respiratory system. The respiratory system is composed of lungs throat etc.

Cellular repiration takes place in the mitochodrion. The 3 phases of cellular respiration are Glycolysis (Fermentation), Krebs Cycle, and Electron Transport. Glycolysis takes place in the cytoplasm. The Krebs cycle and electron transport takes place in the mitochondria.