Final answer:
The three essentials for oxygen supply in the body are the respiratory system's oxygen intake and carbon dioxide release, blood hemoglobin transporting oxygen, and cellular respiration for energy production.
Step-by-step explanation:
The three essentials for keeping the body supplied with oxygen are as follows:
- The respiratory system, which includes the lungs, allows for the intake of oxygen into the body and the release of carbon dioxide.
- The circulatory system, particularly the presence of hemoglobin in the blood, transports oxygen from the lungs to the tissues and cells and brings carbon dioxide back to the heart and lungs for expulsion.
- Efficient cellular respiration, wherein the cells use oxygen to produce ATP, which is vital for energy generation and sustaining life.
Every cell in the body requires oxygen because it is a critical reactant in the oxidative reactions that produce ATP, the energy currency of the cell. Without a steady and sufficient supply of oxygen, vital organs like the brain can sustain damage or fail, leading to serious health consequences or death.