Question

state the role of diaphragm and rib in breathing, alveoli in exchange of gases.

Answer 1

When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand. The intercostalmuscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.

The gas exchange surface of a mammal is the alveolous.

There are numerous alveoli - air sacs, supplied with gases via a system of tubes (trachea, splitting into two bronchi - one for each lung - and numerous bronchioles) connected to the outside by the mouth and nose.

These alveoli provide a massive surface area through which gases can diffuse. These gases diffuse a very short distance between the alveolus and the blood because the lining of the lung and the capillary are both only one cell thick.

The blood supply is extensive, which means that oxygen is carried away to the cells as soon as it has diffused into the blood. Ventilation movements also maintain the concentration gradients because air is regularly moving in and out of the lungs.

Answer 2

Explanation:

I dont know sorry