True or False
Every living cell respires.
TRUE
These are the many spaces inside the lungs that are filled with air when we breathe.
Air sacs or Alveoli
Draw an air sac and a blood capillary around it. Draw on the board.
Capillary lining the air sac
Limewater is a clear liquid. It goes cloudy when carbon dioxide is present. So how would the test tubes without carbon dioxide look like?
They are clear, not cloudy.
Why is the wall of the air sac thin?
FALSE. Expired (breathed out) contains MORE Carbon dioxide than Inspired (breathed in) air.
This is the liquid part of the blood that carries the red blood cells, the white blood cells, and the platelets.
Blood plasma
Where does the blood rich in carbon dioxide come from? Draw on the board.
From the cells of our organs --> to the heart --> to the lungs/air sacs
Why did Emile put bungs/corks to cover all the 4 test tubes?
So that gases produced by the organisms stayed inside the tube, where they (especially carbon dioxide) would make the limewater cloudy.
What is the difference between "Breathing" and "Respiration"?
Breathing is just part of respiration. It is the movement of air/gases into and out of the lungs.
Respiration is the breakdown of food (Glucose + Oxygen = Carbon dioxide + Water) to release energy. It takes place in ALL body cells.
Respiration means the diffusion of gases between the air sacs and the blood.
FALSE. That's "breathing".
These cells which come from the heart carry more carbon dioxide. When they reach the lungs, they take in oxygen and distribute it to all the cells in the body.
Red blood cells
Where does the blood rich in oxygen go to, from the air sacs? Draw on the board.
From the air sacs, the oxygen-rich blood go back to the heart --> the heart pumps it to different parts of the body, to all the cells in the body
Why did Emile put a gauze platform in the middle of the test tubes?
So the gases can move from the organisms to the indicator (limewater) but stopping the organism from falling into the limewater.
How does "gas exchange" happen in an air sac? Explain with detailed information how it starts from the organs of the body.
1. The cells in our organs use up oxygen from the blood and produce carbon dioxide.
2. So this blood now contains only a little oxygen, and lot of carbon dioxide.
3. The blood needs to get oxygen, so it travels back to the heart to be pumped to the lungs.
4. In the lungs, the air sacs are rich in oxygen coming from the air we breathe.
5. In the air sacs, the blood gets more oxygen and releases more carbon dioxide.
6. The oxygen-rich blood now goes back to the heart to be pumped to all the cells in the body.
"Carbon dioxide + Glucose" are the products of Aerobic Respiration.
FALSE. Carbon dioxide + Water
These are the blood vessels lining the air sacs that receive the blood (rich in carbon dioxide) flowing from the heart and send it back to the heart (rich in oxygen) to be pumped all over the body.
Capillaries
Where is the direction of oxygen diffusion? Draw an arrow.
From the air sac --> to the capillary --> to the red blood cells
Why did Emile use 4 test tubes in his experiment, rather than two.
To make his results more reliable. He could add up the 2 results and divide by 2 to calculate the MEAN result.
Create a Table of Results from Emile's experiment. Draw the table on the board.
Tube Content Time (mins.) Mean
A live maggots 6 6.25
B live maggots 6 1/2
C live woodlice 8 1/2 8.75
D live woodlice 9
FALSE. Glucose + Oxygen
This is the big blood vessel that carries blood away from the heart going to the lungs.
Pulmonary artery
Where is the direction of carbon dioxide diffusion? Draw an arrow.
From the red blood cells --> to the capillary --> to the air sacs
What variables should Emile keep the same in his experiment?
1. the temperature
2. the mass of animals in each tube
3. the volume of limewater in each tube
4. the size of each tube
5. the height of the gauze above the limewater
Create a bar graph of the results from Emile's experiment. What conclusion can you draw from Emile's experiment?
Y-axis label: minutes the limewater go cloudy
Y-axis minutes: 0-9
X-axis label: test tubes A, B, C, D
Legend: A, B - live maggots; C, D - live woodlice
Bars: 4 bars
Title of the graph: Rate of Respiration in woodlice and maggots
Conclusion: Maggots respire faster than woodlice.