Respiratory Physiology

Which of the following is a factor on which expiration depends?

• Decrease in the intrapulmonary pressure

• Contraction of expiratory muscles

• Increasing in lung volume

• Recoil of elastic tissue in the lungs

O2 and CO2 are exchanged in the lungs and through all the cell membranes by_______.

• Filtration

• Diffusion

• Active Transport

• Osmosis

Surfactant helps to prevent the alveoli from collapsing by _______.

• Protecting the surface of alveoli from dehydration and other environmental variations

• Interfering with cohesiveness of water molecules, thereby reducing the surface tension of alveolar fluid

• Increasing the surface tension inside the lungs

• Humidifying the air before it enters

Pulmonary ventilation refers to the

• Movement of air into and out of the lungs.

• Movement of dissolved gases from the interstitial space to the cells.

• Movement of dissolved gases from the alveoli to the blood.

• Utilization of oxygen.

Choose the correct statement regarding airway resistance.

• Bronciodiation leads to an increase in airway resistance.

• Bronchioconstriction leads to an increase in airway resistance.

• Airway resistance is a measure of how much effort is required to stretch the lungs.

• An obstruction within the bronchi, like an infection, will decrease airway resistance.

Which of the choices below determines the direction of respiratory gas movement?

• Partial pressure gradient

• The temperature

• Solubility in water

• Size of the gas molecules

Complete the following statement using the choices below.

Air moves out of the lungs when the pressure inside the lungs is_____.

• Greater than the pressure in the atmosphere.

• Equal to the pressure in the atmosphere.

• Less than the pressure in the atmosphere.

Which describes the goal of external respiration?

• Carbon dioxide loading into the blood, oxygen leaving the blood and entering the tissues.

• Oxygen and carbon dioxide loading into the blood.

• Oxygen loading into the blood, carbon dioxide going from the blood into the alveoli.

• Oxygen loads into the cell and carbon dioxide leaves the cells.

Tags

NGSS.HS-LS2-3

What cells clean and digest debris entering the alveoli?

• Type II Alveolar Cells

• Type I Alveolar Cells

• Fluid Cells

• Alveolar Macrophages

Is the following statement true or false?

In the blood, the majority of carbon dioxide is carried bound to the globin portion of the hemoglobin as carbaminohemoglobin in the RBCs.

• True

• False