Quiz on Breathing Mechanics

What muscle contracts and moves downward during inhalation?

• Pectoral muscles

• Abdominal muscles

• Diaphragm

• Intercostal muscles

What happens to the volume of the thoracic cavity during inhalation?

• It remains the same

• It decreases

• It fluctuates

• It increases

Where does gas exchange occur in the lungs?

• Pleura

• Bronchi

• Trachea

• Alveoli

What is the role of the diaphragm during exhalation?

• It remains still

• It contracts and moves downward

• It relaxes and moves upward

• It expands outward

Which part of the brain regulates the rate and depth of breathing?

• Hypothalamus

• Medulla oblongata

• Cerebellum

• Cerebrum

What do chemoreceptors monitor in the body?

• Levels of oxygen and carbon dioxide

• Muscle activity

• Blood pressure

• Heart rate

What condition can decrease lung compliance?

• Bronchitis

• Asthma

• Pneumonia

• Fibrosis

What can increase airway resistance?

• Lung expansion

• Asthma

• Deep breathing

• Relaxation

What is the primary purpose of breathing?

• To deliver oxygen and remove carbon dioxide

• To digest food

• To circulate blood

• To regulate body temperature

What happens to the pressure inside the lungs during inhalation?

• It remains the same

• It fluctuates

• It decreases

• It increases