B3.1 Gas Exchange (Part 1)

What happens to the surface area-to-volume ratio as an organism increases in size?

• The surface area-to-volume ratio increases as an organism increases in size.

• The surface area-to-volume ratio decreases as an organism increases in size.

• The surface area-to-volume ratio fluctuates randomly with size changes.

• The surface area-to-volume ratio remains constant regardless of size.

Which of the following is NOT a property of an efficient gas exchange surface?

• Being thick

• Being thin

• Being moist

• Having a large surface area

What is the primary function of alveoli in the mammalian lungs?

• To filter out dust and particles from the air.

• To regulate blood pressure in the lungs.

• To produce mucus for the respiratory system.

• The primary function of alveoli is to facilitate gas exchange in the lungs.

Which muscle is primarily responsible for inhalation in mammals?

• Pectoralis major

• Abdominal muscles

• Diaphragm

• Intercostal muscles

What is the main gas exchanged in the alveoli?

• Carbon Dioxide

• Nitrogen

• Hydrogen

• Oxygen

Which structure in the respiratory system is responsible for filtering and humidifying air?

• Trachea

• Bronchi

• Alveoli

• Nasal cavity

What is the role of hemoglobin in gas exchange?

• Hemoglobin breaks down carbon dioxide into oxygen.

• Hemoglobin transports oxygen from the lungs to the body's tissues and carries carbon dioxide from the tissues back to the lungs.

• Hemoglobin stores nutrients for the body's cells.

• Hemoglobin is responsible for regulating blood pressure.

Which of the following organisms relies on diffusion for gas exchange?

• Goldfish

• Eagle

• Cactus

• Amoeba

What is the primary purpose of the diaphragm during breathing?

• To provide structural support to the lungs.

• To facilitate the process of inhalation and exhalation by changing the volume of the thoracic cavity.

• To filter out pollutants from the air.

• To regulate blood flow during respiration.

How does the partial pressure of gases affect gas exchange?

• Higher partial pressure of carbon dioxide prevents oxygen diffusion.

• Gas exchange occurs only in the presence of water vapor.

• Partial pressure has no effect on gas exchange.

• The partial pressure of gases creates a gradient that facilitates the diffusion of oxygen and carbon dioxide during gas exchange.