Vocabulary
This is the process by which cells release energy using glucose and oxygen.
What is cellular respiration?
Cells use glucose and ________ to release energy.
What is oxygen?
This system moves molecules like oxygen and glucose through the body.
What is the circulatory system?
Why would someone feel tired if they have low glucose?
Cells can’t release enough energy.
Why can’t protein replace oxygen?
Oxygen is required for cellular respiration; protein cannot replace oxygen in that reaction.
This system breaks down starch into smaller molecules like glucose.
What is the digestive system?
Protein must be broken down into ________ before cells can use it.
What is amino acids?
This is where energy is actually released.
What are cells/the mitochondria?
Why is exercise harder at high altitude?
There is less oxygen available.
What are the inputs and outputs of cellular respiration?
inputs: glucose and oxygen
outputs: energy, water, and carbon dioxide
This food molecule is the main source of energy for cells.
What is glucose?
We get important molecules from these two types of food: ________ and ________
What is starch and protein?
Which system starts the breakdown of starch?
What is the digestive system?
If starch is not broken down properly, what happens?
Cells don’t get enough glucose.
What is the role of amino acids in the cells?
Amino acids are the building blocks of proteins. Inside cells, they join together to make proteins, which help the cell grow, repair itself, and carry out important jobs.
This system brings oxygen into the body.
What is the respiratory system?
If cells don’t get enough oxygen, they cannot release enough ________.
What is energy? (ATP)
Why is the respiratory system important during exercise?
It provides oxygen needed for cellular respiration.
If someone has asthma, what is the main problem for cells?
Cells cannot get enough oxygen.
Why do athletes perform better at sea level than at high altitude?
There is more oxygen available at sea level.
This term describes all of the chemical reactions happening in your body.
What is metabolism?
The respiratory system brings ________ from the air into the lungs.
What is oxygen?
Explain how the digestive and respiratory systems work together.
The digestive system breaks down food into glucose, the respiratory system brings in oxygen, and both go to cells for cellular respiration.
A student eats pasta before soccer. Why does that help?
Pasta contains starch, which is broken into glucose to provide energy during exercise.
Explain the full pathway from pasta to energy in 3–4 steps.
Starch → digestive system → glucose → bloodstream → cells + oxygen → cellular respiration → energy.