Cells require O2to serve as a final electron acceptor in the process of cellular respiration, a series of enzymatic reactions that function to oxidize organic molecules to produce ATP. CO2 is a byproduct of cellular respiration and needs to be removed from tissues. The human respiratory system works with the circulatory system to move these gases around the human body. Below is a series of steps in the process of gas exchange. Reorganize the steps so that they are in the correct order. We have listed the first step in this process below (see “START”). Organize the remaining steps. START: Rib cage and diaphragm muscles contract, increasing the volume of the lungs, creating negative pressure allowing for fresh air to enter the lungs. 1. O2dissociates from hemoglobin and diffuses out of red blood cell across systemic capillaries 2. Blood containing oxygenated hemoglobin (in red blood cells) move through arteries to systemic capillaries 3. CO2diffuses from the capillaries into the alveoli and is ultimately exhaled into the environment 4. O2diffuses across the cells of the alveoli into the capillaries Blood containing CO2moves through the capillaries into the veins 5. CO2produced during cellular respiration in active tissues diffuses from cells into the blood in capillaries (some CO2associates with hemoglobin and most is carried in the plasma) 6. O2diffuses into individual cells to the mitochondria where it is utilized in cellular respiration, the process that generates ATP for the cell 7. O2binds to hemoglobin in red blood cells
Cells require O2to serve as a final electron acceptor in the process of
START: Rib cage and diaphragm muscles contract, increasing the volume of the lungs, creating negative pressure allowing for fresh air to enter the lungs.
1. O2dissociates from hemoglobin and diffuses out of red blood cell across systemic capillaries
2. Blood containing oxygenated hemoglobin (in red blood cells) move through arteries to systemic capillaries
3. CO2diffuses from the capillaries into the alveoli and is ultimately exhaled into the environment
4. O2diffuses across the cells of the alveoli into the capillaries
Blood containing CO2moves through the capillaries into the veins
5. CO2produced during cellular respiration in active tissues diffuses from cells into the blood in capillaries (some CO2associates with hemoglobin and most is carried in the plasma)
6. O2diffuses into individual cells to the mitochondria where it is utilized in cellular respiration, the process that generates ATP for the cell
7. O2binds to hemoglobin in red blood cells
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