1. during the exchange of air in your lungs, oxygen is being taken into your bloodstream while this substance is being released

carbon dioxide***
2. the gas exchange of oxygen to the bloodstream takes place in what part of respiratory system?
3. maintaing a healthy weight allows the resportory system to work more effectivly because
oxygen is being delieverd more adequately ***
the heart does not have to pump as forcefully
the capillaries are constricted
the lung capacity allows for small amounts of air
4. if you choose to smoke your body will use this substance less efficiently.
carbon dioxide

Human respiratory system

I got 100%

1. B

2. C
3. A
4. D


I took my chances and hes 100% right just thought verifying it would help you believe him as well

1. Correct answer: carbon dioxide

During the exchange of air in your lungs, oxygen is taken into your bloodstream while carbon dioxide is being released. To understand this, it's important to know that when you breathe in, oxygen from the air enters your lungs and passes through tiny air sacs called alveoli. These alveoli are surrounded by blood vessels called capillaries. Oxygen diffuses across the alveolar walls into the capillaries and binds to hemoglobin in red blood cells, which then carry it to different parts of the body. At the same time, carbon dioxide produced by body cells is carried in the blood to the lungs. In the alveoli, carbon dioxide diffuses from the capillaries into the alveolar air and is then exhaled.

2. Correct answer: alveoli
The gas exchange of oxygen to the bloodstream takes place in the alveoli. The alveoli are tiny air sacs at the end of the bronchioles in the lungs. These structures have thin walls containing a network of tiny blood vessels called capillaries. It is through the walls of the alveoli and capillaries that oxygen passes from the air into the bloodstream and carbon dioxide passes from the bloodstream into the alveolar air to be exhaled.

3. Correct answer: oxygen is being delivered more adequately
Maintaining a healthy weight allows the respiratory system to work more effectively because oxygen is being delivered more adequately. When you are at a healthy weight, your cardiovascular system functions optimally, ensuring efficient delivery of oxygen-rich blood to the lungs. This enables efficient gas exchange in the alveoli, allowing oxygen to be transported to body tissues effectively. On the other hand, being overweight or obese can lead to decreased lung capacity and increased strain on the heart, making it harder for the respiratory system to transport oxygen to the body's cells.

4. Correct answer: oxygen
If you choose to smoke, your body will use oxygen less efficiently. Smoking cigarettes introduces harmful chemicals into the lungs, including nicotine and carbon monoxide. Nicotine causes blood vessels to constrict, reducing the amount of oxygen-rich blood that can reach the body's tissues. Additionally, carbon monoxide, one of the byproducts of cigarette smoke, binds to hemoglobin in red blood cells more readily than oxygen, reducing the oxygen-carrying capacity of the blood. As a result, smoking decreases the amount of oxygen available to the body's cells and can lead to various negative health effects.