Diffusion-Stomach nutrients Hugo Shiu • The stomach absorbs nutrient from the food we eat, after eating, the whole digestive system will be filled with nutrients. • The small intestine, which is connected after the stomach, is connected to blood vessels, nutrients from small intestine diffuse into blood stream. Furthermore.. • Blood carries the nutrient to the whole body, some cells that are in need of oxygen and nutrient have lower concentration than surrounding blood • The blood therefore passes the nutrient and oxygen to the cells by diffusion. How does it go this direction • The nutrients move to blood by diffusion from an area of high concentration to an area of low concentration, the body ensures the nutrients move in the way they should be by making the digestive system a high concentrated area of nutrient and blood low concentrated area Furthermore… • As the blood gains the nutrient, the blood switch roles to a high concentration of nutrient, the cells surrounding it has a lower concentration of nutrient, making the blood to pass nutrient to it, diffusion occurs. adaptations • The villi in the small intestine provide a large surface area of blood capillaries. This makes the villi easy to absorb the products of digestion by diffusion. Each villus is covered in many microscopic microvilli.
