1. Which of the following best summarizes the function of the respiratory system?
A. to transport oxygen to cells and wastes away from cells.
B. to protect the organs in the chest cavity
C. to move oxygen from the air into the body and carbon dioxide from the body into the air
D. to provide a barrier between the body and the environment
2. Which of the following is not true about the structure of an alveolus?
A. it has thick walls to trap gases that enter during breathing.
B. it has high surface area to allow lots of gas exchange.
C. it has a high concentration of oxygen and a low concentration of carbon dioxide.
D. It has many capillaries running through its structure
I think
1. A
2. A
Is this right?
Answers are
1. D
2. C
3. A
4. B
5. A
The correct answers are:
1. D
2. C
3. A
4. B
5. A
I think it's D. and C.
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100% correct lesson 6 getting oxygen unit 1 the human body
Yes, you are correct!
1. The function of the respiratory system can be summarized as option C: to move oxygen from the air into the body and carbon dioxide from the body into the air. This is accomplished through the process of breathing, where oxygen is inhaled through the nose or mouth, travels down the throat, and enters the lungs. In the lungs, oxygen is exchanged with carbon dioxide, which is a waste product produced by the cells in the body. The oxygen is then transported to the cells through the bloodstream to support cellular respiration, while carbon dioxide is exhaled back into the air.
2. The statement that is not true about the structure of an alveolus is option A: it has thick walls to trap gases that enter during breathing. Alveoli are tiny air sacs located at the end of the bronchioles in the lungs. They have very thin walls made of a single layer of epithelial cells, which allows for efficient gas exchange. The thin walls enable oxygen to pass from the air into the bloodstream while carbon dioxide moves in the opposite direction from the bloodstream into the alveoli. The thinness of the walls is essential for this exchange to occur effectively.