In which situation would air flow into the lungs?

In which situation would air flow into the lungs?

Inspiration (inhalation) is the process of taking air into the lungs. It is the active phase of ventilation because it is the result of muscle contraction. During inspiration, the diaphragm contracts and the thoracic cavity increases in volume. This decreases the intraalveolar pressure so that air flows into the lungs.

What conditions are necessary for air to be exhaled from the lungs?

The air pressure within the lungs increases to above the pressure of the atmosphere, causing air to be forced out of the lungs. However, during forced exhalation, the internal intercostals and abdominal muscles may be involved in forcing air out of the lungs.

What causes air to flow out of the lungs during expiration?

During expiration, the diaphragm and intercostals relax, causing the thorax and lungs to recoil. The air pressure within the lungs increases to above the pressure of the atmosphere, causing air to be forced out of the lungs.

When does air tend to flow into the lungs?

Terms in this set (22) under what internal conditions does air tend to flow into the lungs when thoracic volume increases and pressure decreases under what internal conditions does air tend to flow out of the lungs? explain.

What are the muscles that push air out of the lungs?

The major muscle group for exhalation is made up of the internal intercostals. These muscles pull down on the rib cage and thereby push air out of the lungs. The internal intercostals are the most important respiratory muscles for normal speech and singing, for they are the muscles that propel air out through the mouth and nose.

How are alveolar and intrapleural pressures related to breathing?

The alveolar and intrapleural pressures are dependent on certain physical features of the lung. However, the ability to breathe—to have air enter the lungs during inspiration and air leave the lungs during expiration—is dependent on the air pressure of the atmosphere and the air pressure within the lungs.

How is pulmonary ventilation dependent on atmospheric pressure?

Figure 22.3.1 – Boyle’s Law: In a gas, pressure increases as volume decreases. Pulmonary ventilation is dependent on three types of pressure: atmospheric, intra-alveolar, and interpleural. Atmospheric pressure is the amount of force that is exerted by gases in the air surrounding any given surface, such as the body.

Terms in this set (22) under what internal conditions does air tend to flow into the lungs when thoracic volume increases and pressure decreases under what internal conditions does air tend to flow out of the lungs? explain.

Where does inspiration take place in the lungs?

Intraalveolar pressure is the pressure inside the alveoli of the lungs. Intrapleural pressure is the pressure within the pleural cavity. These three pressures are responsible for pulmonary ventilation. Inspiration (inhalation) is the process of taking air into the lungs.

How does expiration affect the volume of air in the lungs?

During expiration, the relaxation of the diaphragm and elastic recoil of tissue decreases the thoracic volume and increases the intraalveolar pressure. Expiration pushes air out of the lungs.

Figure 22.3.1 – Boyle’s Law: In a gas, pressure increases as volume decreases. Pulmonary ventilation is dependent on three types of pressure: atmospheric, intra-alveolar, and interpleural. Atmospheric pressure is the amount of force that is exerted by gases in the air surrounding any given surface, such as the body.