Answer: lower atmospheric pressure
Explanation:
During the inspiration process the diaphragm, and external intercostal muscles. The contraction of the diaphragm causes the increase in the size of the thoracic cavity this causes the contraction of the external intercostal muscles. As a result of this the ribs and the sternum get elevated.
This causes the lungs to expand, and increasing the volume of the air passage. In this response the air pressure inside the lungs reduces below the air outside the body. Thus this facilitates the movement of the gases from a region of high pressure to low pressure, this way the air rushes into the lungs.
The example that shows an organism maintaining homeostasis is b. a person sweating on a hot day. Homeostasis is an organism's ability to maintain a stable internal environment irrespective of the external environment. When a person's body overheats, the body releases water as perspiration or sweat to cool itself down. Another example is when a person gets cold, the hair on his arms and legs, stand up straight - to trap air circulating round his body, and heat it up.
