1. Steps of breathing Put correct order Inhaling-
Inhaled air enters through the trachea and into the lungs.
To achieve equilibrium the higher pressure air from outside the body rushes in to the lungs.
The diaphragm contracts and flattens out and intercostals muscles contract and the ribcage moves up and out.
The chest cavity increases in size as a low air pressure situation is created .
Correct order- 3, 4, 2, 1

2. Steps of breathing Put in correct order Exhaling-
Exhaled air is forced to exit the nose or mouth.
The diaphragm and intercostals muscles relax. The diaphragm moves up and the ribcage comes back down.
The pressure inside the chest cavity increases relative to the outside air.
The chest cavity decreases in size.
Correct order- 2, 4, 3, 1

3. Random Questions
What is the name of the dome shaped muscle that helps breathe? The Diaphragm. What are some diseases that can reduce how much oxygen your lungs can hold? Emphysema, pneumonia and asthma.

4. List the structures of the respiratory system in order to indicate the path of airflow through the system. Start with "mouth/nose." There are six more.
Capillaries
Trachea
Bronchi
Pharynx
Mouth/Nose
Bronchioles
Alveoli
Correct order-
5, 4,2 , 3 ,6, 7, 1

5. What are some of the similarities between cellular respiration and combustion? Put in order
Oxygen is necessary
 rapidly occurring
 need fuel to sustain
 glucose is the fuel
 energy is released
 inside the body
 produce waste carbon dioxide and water
a flame is produced
Correct order-
1,3,5,7

6. Label the diagram Nasal Passage Pharynx Larynx Trachea Bronchi Pleura
Bronchiole
Alveoli
Diaphragm

7. Random Questions The mucus in your nose collects dirt (and bugs).
How is the bloodstream involved in the exchange of oxygen in the lungs?
Red blood cells drop off oxygen and pick up carbon dioxide in the cells.
Why is it better to breathe through your nose than through your mouth?
The mucus in your nose collects dirt (and bugs).
The hair lining the nose helps to filter out what you don't want in your lungs.

8. During cellular respiration,
 carbon dioxide is used and oxygen is produced.
 oxygen is used and carbon dioxide is stored.
 both oxygen and carbon dioxide are used.
 oxygen is used and carbon dioxide is produced.
Correct answer- 4

9. What are the similarities and differences between the “Cellular Respiration” lab and real cellular respiration?
Similarities
Both used in oxygen
Both released carbon dioxide
Made water
Released Energy
Differences
Combustion isn't in living things
No mitochondria
For the release of energy, it has different fuels, in the experiment the energy was wax. In our bodies the energy is glucose.

10. Why do we need to breathe
Why do we need to breathe? Use the words: energy, life processes, oxygen, carbon dioxide, bloodstream, cells, mitochondria and glucose.
 We need to breathe because our body needs oxygen it so it can combine with glucose and produce ATP- energy. ATP is needed for life processes. When we breathe, oxygen goes into the alveoli where there is an exchange of gases. Oxygen passes into the bloodstream and carbon dioxide goes into the alveoli from the bloodstream. The oxygen goes into the cell and the mitochondria produce energy combining the oxygen and the natural sugar glucose to form ATP, cell's main source of energy. Carbon dioxide is a byproduct of this.

11. Refer to this diagram of what happens when the oxygen and the carbon dioxide reaches the alveoli. Use these words to explain what is happening: capillary, red blood cell, diffusion, oxygen, carbon dioxide, and alveoli.
When you breathe, oxygen enters the alveoli. In the alveoli, oxygen diffuses into the red blood cells, that are in the capillaries- a blood vessel. Then, the carbon dioxide in the capillaries diffuses into the alveoli. This is a gas exchange.