The cells and tissues of the nose, throat, chest diaphragm and lungs from the

Analyze the question: The question lists the nose, throat, chest, diaphragm and lungs. It asks which body system these organs and tissues belong to. (The wording is slightly incomplete, but it means "...form the ___ system.")

Explain the concept: In biology, cells form tissues, tissues form organs, and organs working together form a system. Each system has a specific function.

Solution, step by step:

1. Nose: Air enters through the nostrils, where it is filtered, warmed and moistened.
2. Throat (pharynx, larynx, trachea): Air passes down through these to the chest.
3. Chest (thoracic cavity, ribs and intercostal muscles): These change the volume of the chest cavity during breathing.
4. Diaphragm: This muscle contracts and relaxes to draw air in and push it out.
5. Lungs: Gaseous exchange takes place here. Oxygen enters the blood and carbon dioxide leaves it.

All these structures work together for breathing and gaseous exchange, which is the job of the respiratory system.

Checking the other options:

• A. Circulatory system: This involves the heart, blood and blood vessels.
• C. Transport system: This is another name for the circulatory system, and in plants it means xylem and phloem.
• D. Digestive system: This involves the mouth, oesophagus, stomach and intestines.

**Correct answer: B, the respiratory system.

Tip: Link the organs to the function. Anything to do with breathing (nose, trachea, diaphragm, lungs) belongs to the respiratory system. Anything to do with pumping blood belongs to the circulatory system.