Cells use ❌ and oxygen to produce ❌. During this process, they release waste substances and ❌.

❌: Substances we eat.
❌: Mixture of food and saliva.
❌: Mixture of food, saliva and gastric juices.
❌: Mixture of food, saliva, gastric juices and other juices from pancreas, liver and small intestine.
❌: Substances absorbed in the small intestine that we use to produce energy.
❌: Waste substances that are expelled through the anus.

Number these events:
1- The heart sends oxygenated blood to the small intestine through the aorta artery.
❌- The blood goes back to the heart through the vena cava.
❌- The cells in our body use the oxygen and the nutrients to produce energy. During this process, they release waste substances and carbon dioxide.
❌- The blood goes to the kidneys to be cleaned of waste substances.
❌- In the lungs, the gas exchange takes place. The carbon dioxide passes to the lungs to be expelled and the oxygen in the lungs passes to the blood.
❌- Here, the blood collects the nutrients and goes to all the cells in our body.
❌- After arriving at the heart, it pumps and sends the blood to the lungs through the pulmonary artery.
8- The blood with oxygen goes back to the heart through the pulmonary vein and the process starts again.