Exploring the Respiratory System

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

• To filter dust and particles from the air

• To facilitate gas exchange between air and blood

• To produce mucus

• To support the structure of the lungs

Which muscle is primarily responsible for the process of inhalation?

• Intercostal muscles

• Diaphragm

• Abdominal muscles

• Pectoral muscles

Describe the role of the diaphragm during inhalation.

• It contracts and moves upward, decreasing thoracic volume

• It relaxes and moves downward, increasing thoracic volume

• It contracts and moves downward, increasing thoracic volume

• It relaxes and moves upward, decreasing thoracic volume

Identify the structure that serves as the main passageway for air to enter the lungs.

• Esophagus

• Trachea

• Bronchioles

• Alveoli

Explain how oxygen is transported from the alveoli to the bloodstream.

• Through active transport

• By diffusion across the alveolar and capillary walls

• Via osmosis

• Through facilitated diffusion

What is the primary gas exchanged for oxygen in the lungs?

• Nitrogen

• Carbon dioxide

• Helium

• Argon

Which part of the lung is directly involved in the gas exchange process?

• Bronchi

• Alveoli

• Pleura

• Diaphragm

How does the structure of alveoli facilitate efficient gas exchange?

• They have thick walls to prevent gas loss

• They are surrounded by a dense network of capillaries

• They are filled with fluid to dissolve gases

• They have a large surface area and thin walls

What happens to the diaphragm during exhalation?

• It contracts and moves downward

• It relaxes and moves upward

• It contracts and moves upward

• It relaxes and moves downward

Which of the following best describes the mechanics of breathing?

• It is a passive process involving only the diaphragm

• It involves the contraction and relaxation of the diaphragm and intercostal muscles

• It is controlled solely by the brainstem

• It requires conscious effort at all times