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Which is the correct order of events during inhalation?

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Which is the correct order of events during inhalation?

Inspiratory muscles contract (diaphragm descends; rib cage rises). Thoracic cavity volume increases. Intrapulmonary pressure drops (to −1 mm Hg). Air (gases) flows into lungs down its pressure gradient until intrapulmonary pressure is 0 (equal to atmospheric pressure).

What is the process of inspiration?

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 are the parts of inspiration?

The first phase is called inspiration, or inhaling. When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside.

What event initiates the process of inspiration?

Process of Inspiration Inspiration is the phase of ventilation in which air enters the lungs. It is initiated by contraction of the inspiratory muscles: Diaphragm – flattens, extending the superior/inferior dimension of the thoracic cavity.

What is the correct pathway of oxygen to the lungs?

Pathway of air: nasal cavities (or oral cavity) > pharynx > trachea > primary bronchi (right & left) > secondary bronchi > tertiary bronchi > bronchioles > alveoli (site of gas exchange)

What is the first event in inspiration quizlet?

29. The first event in inspiration is A. the diaphragm moves downward and the external intercostal muscles contract.

What are the four steps of inspiration?

Terms in this set (10)

  • inspiration 1. inspiratory muscles contract.
  • inspiration 2. thoracic cavity volume increases.
  • inspiration 3. lungs are stretched.
  • inspiration 4. intrapulmonary pressure drops.
  • inspiration 5. air flows into lungs down pressure gradient until pulmonary pressure is 0.
  • expiration 1.
  • expiration 2.
  • expiration 3.

What event initiates the process of inspiration quizlet?

What event initiates the process of inspiration? the contraction of the diaphragm. 2. True or False: As alveolar volume increases, alveolar pressure decreases.

What is the correct order of the events during expiration?

Inspiratory muscles relax (diaphragm rises; rib cage descends due to recoil of costal cartilages). Thoracic cavity volume decreases. Elastic lungs recoil passively; intrapulmonaryVolume decreases. Intrapulmonary pressure rises (to +1 mm Hg).