Question

If the partial pressure of O2 is 75 inside the blood, and the partial pressure inside the lungs is 50, oxygen will flow out of the lungs.

True/False

Residual volume is also called physiological dead space.

True/False

Which is the first event that occurs during inspiration?

A. The diaphragm moves downward and the external intercostal muscles move the chest wall up and out.

B. The lungs go inward before they inflate.

C. Intra-Alveolar pressure is decreased.

D. Atmospheric pressure forces air into the lungs.

A tracheostomy allows air to bypass an obstruction.

True/False

The larynx contains the _____.

Stratified squamous epithelium

Ciliated columnar epithelium

Loose connective tissue

Vocal cords

The sensors that detect oxygen levels are found in the carotid arteries and the lungs.

True/False

Answer 1

1. If the partial pressure of O2 is 75 inside the blood, and the partial pressure inside the lungs is 50, oxygen will flow out of the lungs.

Answer: True

Explanation: Gases diffuses from high pressure region to low pressure region.

2. Residual volume is also called physiological dead space.

Answer: False

Explanation: Amount of air that remains within lungs after a forced exhalation is called residual volume. This air participates in gasseous exchange. Dead space is the volume of a breath that does not participate in gas exchange. It is ventilation without perfusion. Physiologic or total dead space is the sum of anatomic dead space and alveolar dead space.

3. A. The diaphragm moves downward and the external intercostal muscles move the chest wall up and out

Explanation: Inspiration is initiated when diaphragm contracts and gets lowered by flattening increasing the volume of the thoracic cavity.

4. True

Explanation: Tracheostomy is the procedure to open the trachea to outside through neck.

5.Vocal cords