1. Respiratory System
The organ system responsible for the exchange of oxygen and carbon dioxide in the body.
Controls Breathing
Exchanges Gasses

2. Heart, Blood, Blood Vessels and Veins
Circulatory System
The organ system responsible for moving blood, oxygen and nutrients throughout the body/
Keeps the Cells Alive
Heart, Blood, Blood Vessels and Veins

3. In the front part of the chest cavity. Where gas exchange happens.
Lungs
Principal parts of the respiratory system. In the lungs, oxygen from the air that is inhaled (breathed in) is transferred into the blood, while carbon dioxide is removed from the blood and exhaled (breathed out.)
In the front part of the chest cavity.
Where gas exchange happens.

4. A rigid tube that connects the mouth with the bronchi.
Trachea
A rigid tube that connects the mouth with the bronchi.
Windpipe
Located in the Throat

5. Diaphragm
Muscle at the bottom of the chest cavity that contracts and relaxes, making us breathe.
Separates the chest cavity from the abdomen.
Primary muscle of respiration.
Increases and decreases the pressure in the chest cavity to make you breathe.

6. Connects to the Bronchia at one end and the Alveoli at the other end.
Bronchioles
Many small tubes that branch from each bronchus into the lungs. They get smaller and smaller.
Connects to the Bronchia at one end and the Alveoli at the other end.

7. Where the gas exchange happens in the lungs.
Alveoli
A tiny, thin-walled air sac at the end of the bronchiole branches (plural - alveoli).
Where the gas exchange happens in the lungs.

8. Diffusion
The movement of atoms or molecules from an area of higher concentration to an area of lower concentration.
Atoms and small molecules can move across a cell membrane by diffusion.

9. Cellular Respiration
A series of chemical reactions that turns food (glucose) into usable energy for the cell.
Glucose plus oxygen equals carbon dioxide, water and ATP (Energy)
C6H12O6 + 6O2 --> 6H2O + 6CO2 + ATP.

10. Mitochondria
Mitochondria are the cell's power producers. They convert energy into forms that are usable by the cell. Located in the cytoplasm, they are the sites of cellular respiration which makes energy for the cell's activities.
Organelles that act like a digestive system for the cell. They take in nutrients, break them down, and create energy.
The number of mitochondria in a cell depends on the cell’s job. For example, a muscle cell that needs a lot of energy will contain more mitochondria.

11. Glucose
The most common form of sugar, found in the bodies of living things; a molecule composed of carbon, oxygen, and hydrogen.
Glucose is involved in the production of energy in both plants and animals.

12. ATP
A high energy molecule that stores the energy we need. Living things can use ATP like a battery. The ATP can power needed reactions by losing one of its phosphorous groups. You can use food energy in the mitochondria to convert ADP back to ATP so that the energy is again available to do needed work.
It is present in all living cells.
Adenosine Triphosphate

13. Able to live, grow, or take place only where free oxygen is present
Aerobic
Able to live, grow, or take place only where free oxygen is present
Aerobic respiration requires oxygen and glucose and produces energy, water and carbon dioxide.
Takes place in the mitochondria.

14. Anaerobic
Living without oxygen
Anaerobic respiration requires glucose and produces a little energy, carbon dioxide and lactic acid.