Statements A,B and E are correct while statements C and D are incorrect.

A.The diaphragm and intercostal muscles are involved in the process of breathing by creating pressure gradients that allow air to move in and out of the lungs.

B.Alveoli are the primary sites of gas exchange in the respiratory system, where oxygen enters the bloodstream and carbon dioxide is removed.

C.Oxyhemoglobin refers specifically to the binding of oxygen with haemoglobin in the blood, not carbon dioxide.

D.Diffusion is the process by which gases like oxygen and carbon dioxide move across the respiratory membrane and into or out of the bloodstream, but it is not the process by which they are transported through the bloodstream.

E.The medulla, located in the brainstem, contains the respiratory rhythm center which regulates the respiratory rate and maintains the breathing pattern.

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