Breathing and Respiration

What is the process by which oxygen enters the body and carbon dioxide is removed?

• Breathing

• Respiration

• Photosynthesis

• Digestion

Which of the following structures is responsible for the exchange of oxygen and carbon dioxide in the lungs?

• A. Bronchi

• B. Trachea

• C. Alveoli

• D. Diaphragm

Which muscle contracts and relaxes to facilitate breathing?

• A. Diaphragm

• B. Intercostal muscles

• C. Abdominal muscles

• D. Quadriceps

What is the correct sequence of structures that air passes through during inhalation?

• A. Trachea → Bronchi → Alveoli

• B. Alveoli → Bronchi → Trachea

• C. Trachea → Alveoli → Bronchi

• D. Bronchi → Trachea → Alveoli Answer

What is the purpose of mucus in the respiratory system?

• A. To humidify the air

• B. To transport oxygen to body tissues

• C. To trap dust and pathogens

• D. To produce sound during speech

Which gas is exchanged in the alveoli of the lungs?

• A. Oxygen and nitrogen

• B. Oxygen and carbon dioxide

• C. Carbon dioxide and nitrogen

• D. Carbon dioxide and water vapor

How is oxygen transported in the bloodstream?

• A. Dissolved in plasma

• B. Bound to hemoglobin in red blood cells

• C. Carried by white blood cells

• D. Absorbed by platelets

Where does aerobic respiration occur in cells?

• A. Nucleus

• B. Cytoplasm

• C. Ribosomes

• D. Mitochondria

What is the waste product of aerobic respiration?

• A. Oxygen

• B. Carbon dioxide

• C. Glucose

• D. Water

How is glucose broken down during cellular respiration? Answer: B. Aerobically

• A. Anaerobically

• B. Aerobically

• C. Photosynthetically

• D. Chemically