The Major function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli, the layers of the cells lining the alveoli and the surrounding capillaries are each only one cell thick and are in very close contact with each other, the barrier between air and blood averages about 1 micron in thickness. Oxygen diffuses quickly through the air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.
<span>Cardiac muscle must function without the need for Oxygen control.</span>
Answer:
a, b, and c
Explanation:
All is true except for d, because some aquatic plants have cuticles, but they are very thin.
1. D 2. A 3. C 4. B tell me if I’m right
Answer:
They may be soggy and stinky, but they provide critical habitat for tons of plants and animals, help clean our water, control floods, and provide food for humans.
