Cardiovascular and Respiratory system: Oxygen that is inhaled is needed for cellular respiration (cardiac muscle contraction), Carbon dioxide is a waste product of cellular respiration. This is transported back to the lungs to be exhaled., Oxygen that is inhaled diffuses across alveoli walls into the red blood cells in the capillaries., The heart pumps oxygenated blood round the body., Cardiovascular and Digestive system: Oxygen in the blood is used by the digestive system, Oxygen used by muscles carrying out peristalsis, Carbon dioxide created by peristaltic contraction is taken in the blood back to the lungs., Glucose and amino acids absorbed in digestive system are taken to where they are needed by the blood vessels., Some of the glucose absorbed is used by cardiovascular organs., Respiratory and Digestive system: Glucose and oxygen used in aerobic respiration to create energy, Muscles that contract during inhalation and exhalation need glucose to function, Muscles used in digestive process require oxygen,
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