Question

ezra eats a cheese sandwich for lunch. cheese contains a lot of protein, and bread is mostly starch. ezra plans to play basketball later in the afternoon. he is breathing normally.
what does ezra need from the food he ate and the air he breathes so that he can play basketball? how do ezras body systems work together to get the molecules he needs into his cells? how do his cells use these molecules to release energy for his body to run?

Explanation:

Ezra needs glucose (from starch digestion) and amino acids (from protein digestion) from food, and oxygen from air. Digestive system breaks food into molecules (e.g., starch → glucose, protein → amino acids). Respiratory system takes in oxygen. Circulatory system transports these molecules (glucose, amino acids, oxygen) to cells. In cells, through cellular respiration (glucose + oxygen → carbon dioxide + water + energy), energy (in form of ATP) is released for body to use (like playing basketball).

Answer:

Ezra needs glucose (from starch), amino acids (from protein) from food and oxygen from air. Digestive breaks food, respiratory takes in oxygen, circulatory transports. Cells use cellular respiration (glucose + oxygen) to release energy (ATP).