Question 1

Why does alveolar air have less O₂ compared with inhaled air?

Accepted Answer

Alveolar air is humidified as it passes through the respiratory tract, causing it to have more water vapor and therefore less O₂ compared to inhaled air.

Question 2

What is the difference between pulmonary and systemic gas exchange?

Accepted Answer

Pulmonary gas exchange occurs only in the lungs, specifically in the alveoli, where oxygen diffuses from the air into the bloodstream and carbon dioxide diffuses from the bloodstream into the air. Systemic gas exchange occurs throughout the body, specifically at the capillaries, where oxygen and nutrients are released from the bloodstream into the tissues, and carbon dioxide and waste products are taken up from the tissues into the bloodstream. Therefore, pulmonary gas exchange is limited to the lungs while systemic gas exchange occurs throughout the body.

Question 3

_____ _____ is a clinical application of Henry's law used to treat diseases caused by anaerobic bacteria, such as those that cause tetanus and gangrene.

Accepted Answer

The answer of _____ _____ is a clinical application of...

Question 4

In an adult, tidal volume of lungs is 600 mL/breath, and respiratory rate is about 14 breaths/min. What is the average minute ventilation?

Accepted Answer

Minute ventilation is calculated by multiplying tidal volume by respiratory rate: 600 mL/breath * 14 breaths/min = 8400 mL/min.

Question 5

1 mL of O₂ is bound to 100 mL of blood. The maximum amount of O₂ that can potentially be bound is 1.30 mL per 100 mL of blood. Calculate the percentage saturation of hemoglobin.

Accepted Answer

The answer of 1 mL of O₂ is bound to...

Question 6

How is the percent saturation of hemoglobin calculated?

Accepted Answer

The percent saturation of hemoglobin is the amount of oxygen that is actually bound to hemoglobin divided by the maximum amount of oxygen that can potentially be bound, expressed as a percentage. Therefore, the correct formula is (Amount of O₂ actually bound/ Maximum amount of O₂ that can potentially be bound) x 100.

Question 7

A characteristic feature of emphysema is damaged alveolar walls. What is a consequence of this condition?

Accepted Answer

Damaged alveolar walls in emphysema lead to a decrease in the rate of pulmonary gas exchange since the damaged alveoli cannot efficiently exchange gases with the bloodstream. This results in less oxygen being delivered to the body and less carbon dioxide being eliminated from the body. Choices A, B, C, and E are not consequences of emphysema.

Question 8

According to Boyle's law, each gas in a mixture of gases exerts its own pressure as if no other gases are present.

Accepted Answer

Boyle's law states that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature. The statement about each gas exerting its own pressure as if no other gases are present describes Dalton's Law of Partial Pressures, not Boyle's Law.

Question 9

Which is a factor that helps maintain an optimal rate of pulmonary and systemic gas exchange in our body?

Accepted Answer

The partial pressure difference between alveolar and blood (PCO2 and PO2) is a major factor that drives gas exchange in our body. If there is a higher partial pressure difference between alveolar and blood, the diffusion of gases is more efficient. As a result, a higher partial pressure difference ensures optimal gas exchange. Other options are incorrect as they oppose the factors that maintain optimal gas exchange in our body.

Question 10

A scuba diver breathing air under high pressure is likely to experience giddiness due to the

Accepted Answer

The correct answer is due to the dissolution of a considerable amount of nitrogen in the plasma under high pressure, which can lead to nitrogen narcosis, a condition that causes giddiness and other symptoms in scuba divers.

Question 11

Identify the true statement about pulmonary gas exchange.

Accepted Answer

The answer of Identify the true statement about pulmonary gas...

Question 12

_____ _____ is defined as the volume of air per minute that actually reaches the respiratory zone.

Accepted Answer

The answer of _____ _____ is defined as the volume...

Question 13

The pressure of a specific gas in a mixture is called its

Accepted Answer

The pressure of a specific gas in a mixture is called its partial pressure. This is because each gas in a mixture exerts its own pressure, which contributes to the total pressure of the mixture. The partial pressure is the pressure that would be exerted by the gas if it were the only gas in the container. Hydrostatic pressure refers to the pressure exerted by a liquid at rest, osmotic pressure is the pressure required to prevent the flow of water across a semipermeable membrane, differential pressure refers to the difference in pressure between two points, and absolute pressure is the total pressure, including atmospheric pressure.

Question 14

Under what condition does more oxygen combine with hemoglobin?

Accepted Answer

Hemoglobin has a higher affinity for oxygen when the partial pressure of oxygen is high. This allows more oxygen to bind with hemoglobin and be transported throughout the body. This is often the case at sea level or at normal atmospheric pressures. Conversely, at very high altitudes or when the partial pressure of oxygen is low, hemoglobin has a lower affinity for oxygen and may not bind to it as readily.

Question 15

Imagine that the atmosphere is made up of only nitrogen, oxygen, and carbon dioxide. Given that the partial pressures of the three gases is 597.4 mmHg, 158.8 mmHg, and 0.3 mmHg respectively, what is the total atmospheric pressure?

Accepted Answer

The total atmospheric pressure can be calculated by adding the partial pressures of all the gases present. Therefore, 597.4 mmHg (nitrogen) + 158.8 mmHg (oxygen) + 0.3 mmHg (carbon dioxide) = 756.5 mmHg.

Question 16

Identify the process indicated by the circle in the figure below.

Accepted Answer

The answer of Identify the process indicated by the circle...

Question 17

How can a scuba diver prevent himself or herself from developing decompression sickness?

Accepted Answer

The best way to prevent decompression sickness is to ascend slowly to the sea surface. This allows the body to eliminate excess nitrogen gradually, reducing the risk of forming bubbles in the bloodstream. Ascending rapidly increases the risk of developing decompression sickness. Using nitrogen-free compressed air or compressed gas with high oxygen concentration may not necessarily prevent decompression sickness as they do not address the issue of nitrogen saturation in the body. Adequate humidification of the compressed air is also important for the diver's comfort and safety, but it does not directly prevent decompression sickness.

Question 18

Henry's law states:

Accepted Answer

Henry's law states that the quantity of a gas that will dissolve in a liquid is proportional to the partial pressure of the gas above the liquid and its solubility constant (which depends on temperature and the identity of the gas and liquid).

Question 19

Why is CO₂ more soluble in blood plasma than O₂?

Accepted Answer

The solubility of a molecule in blood plasma depends on its ability to dissolve in water, as blood plasma is mostly made up of water. Since CO₂ is highly soluble in water, it would be more soluble in blood plasma than O₂. The other options do not impact the solubility of the molecule in blood plasma.

Question 20

In an adult, tidal volume measures 500 mL/breath, anatomic dead space is 120 mL/breath, and respiratory rate is about 10 breaths/min. What is the alveolar ventilation?

Accepted Answer

Alveolar ventilation is calculated by subtracting the anatomic dead space from the tidal volume and then multiplying by the respiratory rate. So, (500 mL - 120 mL) * 10 breaths/min = 380 mL/breath * 10 breaths/min = 3.8 L/min.

Quiz 18: The Respiratory System

Why does alveolar air have less O₂ compared with inhaled air?

What is the difference between pulmonary and systemic gas exchange?

_ _ is a clinical application of Henry's law used to treat diseases caused by anaerobic bacteria, such as those that cause tetanus and gangrene.

In an adult, tidal volume of lungs is 600 mL/breath, and respiratory rate is about 14 breaths/min. What is the average minute ventilation?

1 mL of O₂ is bound to 100 mL of blood. The maximum amount of O₂ that can potentially be bound is 1.30 mL per 100 mL of blood. Calculate the percentage saturation of hemoglobin.

How is the percent saturation of hemoglobin calculated?

A characteristic feature of emphysema is damaged alveolar walls. What is a consequence of this condition?

According to Boyle's law, each gas in a mixture of gases exerts its own pressure as if no other gases are present.

Which is a factor that helps maintain an optimal rate of pulmonary and systemic gas exchange in our body?

A scuba diver breathing air under high pressure is likely to experience giddiness due to the

Identify the true statement about pulmonary gas exchange.

_ _ is defined as the volume of air per minute that actually reaches the respiratory zone.

The pressure of a specific gas in a mixture is called its

Under what condition does more oxygen combine with hemoglobin?

Imagine that the atmosphere is made up of only nitrogen, oxygen, and carbon dioxide. Given that the partial pressures of the three gases is 597.4 mmHg, 158.8 mmHg, and 0.3 mmHg respectively, what is the total atmospheric pressure?

Identify the process indicated by the circle in the figure below.

How can a scuba diver prevent himself or herself from developing decompression sickness?

Henry's law states:

Why is CO₂ more soluble in blood plasma than O₂?

In an adult, tidal volume measures 500 mL/breath, anatomic dead space is 120 mL/breath, and respiratory rate is about 10 breaths/min. What is the alveolar ventilation?

Quiz 18: The Respiratory System

Why does alveolar air have less O2 compared with inhaled air?

What is the difference between pulmonary and systemic gas exchange?

_____ _____ is a clinical application of Henry's law used to treat diseases caused by anaerobic bacteria, such as those that cause tetanus and gangrene.

In an adult, tidal volume of lungs is 600 mL/breath, and respiratory rate is about 14 breaths/min. What is the average minute ventilation?

1 mL of O2 is bound to 100 mL of blood. The maximum amount of O2 that can potentially be bound is 1.30 mL per 100 mL of blood. Calculate the percentage saturation of hemoglobin.

How is the percent saturation of hemoglobin calculated?

A characteristic feature of emphysema is damaged alveolar walls. What is a consequence of this condition?

According to Boyle's law, each gas in a mixture of gases exerts its own pressure as if no other gases are present.

Which is a factor that helps maintain an optimal rate of pulmonary and systemic gas exchange in our body?

A scuba diver breathing air under high pressure is likely to experience giddiness due to the

Identify the true statement about pulmonary gas exchange.

_____ _____ is defined as the volume of air per minute that actually reaches the respiratory zone.

The pressure of a specific gas in a mixture is called its

Under what condition does more oxygen combine with hemoglobin?

Imagine that the atmosphere is made up of only nitrogen, oxygen, and carbon dioxide. Given that the partial pressures of the three gases is 597.4 mmHg, 158.8 mmHg, and 0.3 mmHg respectively, what is the total atmospheric pressure?

Identify the process indicated by the circle in the figure below.

How can a scuba diver prevent himself or herself from developing decompression sickness?

Henry's law states:

Why is CO2 more soluble in blood plasma than O2?

In an adult, tidal volume measures 500 mL/breath, anatomic dead space is 120 mL/breath, and respiratory rate is about 10 breaths/min. What is the alveolar ventilation?

Why does alveolar air have less O₂ compared with inhaled air?

_ _ is a clinical application of Henry's law used to treat diseases caused by anaerobic bacteria, such as those that cause tetanus and gangrene.

1 mL of O₂ is bound to 100 mL of blood. The maximum amount of O₂ that can potentially be bound is 1.30 mL per 100 mL of blood. Calculate the percentage saturation of hemoglobin.

_ _ is defined as the volume of air per minute that actually reaches the respiratory zone.

Why is CO₂ more soluble in blood plasma than O₂?