AP BIOLOGY

Detailed explanation-1: -The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.

Detailed explanation-2: -Each time you exhale, you are releasing carbon dioxide gas (CO2) into the atmosphere. Animals and plants need to get rid of carbon dioxide gas through a process called respiration.

Detailed explanation-3: -CO2 is transported in the bloodstream to the lungs where it is ultimately removed from the body through exhalation.

Detailed explanation-4: -When we breathe in air it contains oxygen reaches the lungs. There the gaseous exchange takes place. The air which we breathe out contains carbon dioxide. Therefore the air which we blow contains carbon dioxide reacts with the lime water and calcium carbonate is formed, which turns the lime water milky.

Detailed explanation-5: -The carbon dioxide is dissolved in the blood, carried to the lungs by the circulation, and breathed out. Every living cell of our body carries out the energy-releasing process of respiration, where glucose (a simple sugar) is slowly “burnt” (oxidised) to give off carbon dioxide (excreted through the lungs) and water.