Question | Answer |
What is the name for the finger-like projections in the small intestine? | Villi |
What is the function of the villi? | Absorb nutrients from food |
Why is the small intestine good at absorbing food? | Large number of villi providing a large surface area. |
Give three features of the villi that allow them to easily absorb nutrients | Large surface area, thin walls, good blood supply. |
Which part of the villi absorbs fatty acids and glycerol? | Lacteal |
Which component of the villi absorbs glucose and amino acids? | Blood capillary |
What does the blood capillary absorb? | Glucose and amino acids |
What does the lacteal absorb? | Fatty acids and glycerol |
What are the main gas exchange organs? | The lungs |
What do the lungs contain that provide them with a large surface area? | A large number of alveoli |
What are the 3 features of alveoli that allow gas exchange? | Large surface area, good blood supply, thin walls |
Give one feature of tissues which allows them to exchange materials with cells? | They have capillary networks. |
Which two substances must be absorbed into the bloodstream to be delivered to cells? | Oxygen and nutrients from food. |
Which waste product must be removed from the cells into the bloodstream? | Carbon dioxide |