Respiratory System Mechanics

This video by Armando Hasurungan explains the mechanism of breathing, focusing on the anatomy of the respiratory system, the role of muscles like the diaphragm and intercostal muscles, and the pressures involved in inspiration and expiration. It covers how gases move from high to low pressure areas, the changes in intrapulmonary volume and pressure, and the cycle of breathing. The video also touches on voluntary control and accessory muscles involved in respiration.

What is the basic rule about the movement of gases?

• Gases do not move based on pressure.

• Gases move randomly.

• Gases move from high to low pressure.

• Gases move from low to high pressure.

Which of the following is NOT part of the respiratory tract?

• Trachea

• Larynx

• Bronchi

• Esophagus

What is the role of the diaphragm in respiration?

• It increases lung pressure.

• It decreases lung volume.

• It contracts to increase lung volume.

• It relaxes to increase lung volume.

What is the atmospheric pressure measured in mmHg?

• 780 mmHg

• 770 mmHg

• 750 mmHg

• 760 mmHg

How does the intrapulmonary pressure change during inspiration?

• It increases to 762 mmHg.

• It decreases to 759 mmHg.

• It remains at 760 mmHg.

• It increases to 761 mmHg.

What happens to the diaphragm during inspiration?

• It moves up.

• It moves down.

• It stays in place.

• It rotates.

During expiration, what happens to the intrapulmonary pressure?

• It decreases to 758 mmHg.

• It remains at 760 mmHg.

• It increases to 761 mmHg.

• It decreases to 759 mmHg.

What is the role of intercostal muscles during expiration?

• They contract.

• They relax.

• They expand.

• They rotate.

Which muscles are considered accessory muscles in breathing?

• Trapezius and deltoid muscles

• Diaphragm and intercostal muscles

• Sternocleidomastoid and scalene muscles

• Abdominal and pectoral muscles

What happens to the thoracic cavity volume during inspiration?

• It increases.

• It fluctuates.

• It remains the same.

• It decreases.