Q: Which equation correctly represents aerobic respiration in human cells?

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy}}$$

Question 1

Which of the following best describes the main function of the alveoli in the human respiratory system?

Accepted Answer

To provide a large surface area for the exchange of oxygen and carbon dioxide between air and blood

Question 2

During inhalation, which of the following changes occurs in the thoracic cavity to allow air to enter the lungs?

Accepted Answer

The diaphragm contracts and moves downward, decreasing pressure in the thoracic cavity

Question 3

Which equation correctly represents aerobic respiration in human cells?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}}$$

Question 4

A patient is diagnosed with a condition where the pleural fluid is reduced, causing friction between the lungs and chest wall. What is the most likely consequence?

Accepted Answer

Difficulty in lung expansion and pain during breathing

Question 5

Which of the following best explains why the trachea is lined with ciliated epithelial cells and mucus-secreting goblet cells?

Accepted Answer

To trap and remove dust and microorganisms from inhaled air

Question 6

Which of the following changes in gas composition occurs between inhaled and exhaled air?

Accepted Answer

The percentage of oxygen decreases and carbon dioxide increases in exhaled air

Question 7

A person inhales deeply and holds their breath. Which of the following best describes what happens to the partial pressure of carbon dioxide ($$P_{CO_2$}) in $$their blood?

Accepted Answer

$$P_{CO_2$}$$ increases because carbon dioxide produced by cells is not being removed

Question 8

Which of the following statements about the bronchial tree is correct?

Accepted Answer

The bronchial tree is a highly branching network that ends in alveoli where gas exchange occurs

Question 9

During vigorous exercise, which of the following best explains why breathing rate increases?

Accepted Answer

To supply more oxygen for increased cellular respiration and remove excess carbon dioxide

Question 10

Which of the following best describes the role of intercostal muscles during ventilation?

Accepted Answer

They contract to raise the ribs upward and outward, increasing thoracic volume during inhalation

Question 11

A person suffers from a genetic disorder that causes their cilia to be immobile. Which of the following is a likely consequence?

Accepted Answer

Accumulation of mucus and increased risk of respiratory infections

Question 12

Which of the following is the correct sequence of air flow from the external environment to the site of gas exchange in the lungs?

Accepted Answer

Nasal cavity → trachea → bronchi → bronchioles → alveoli

Question 13

Which of the following best explains why the alveoli are surrounded by a dense network of capillaries?

Accepted Answer

To maximize the surface area for efficient gas exchange between air and blood

Question 14

If the diaphragm is paralyzed, which of the following is most likely to occur?

Accepted Answer

The person will be unable to ventilate the lungs effectively, leading to respiratory failure

Question 15

Which of the following statements about the composition of inhaled and exhaled air is correct?

Accepted Answer

Exhaled air contains less oxygen and more carbon dioxide than inhaled air

Question 16

A student is asked to explain why the lungs do not collapse even though they are surrounded by a vacuum in the pleural cavity. Which is the best explanation?

Accepted Answer

The pleural fluid creates surface tension that keeps the lungs expanded against the chest wall

Question 17

Which of the following best describes the process of ventilation in the lungs?

Accepted Answer

The movement of air in and out of the lungs due to pressure differences

Question 18

A person with a blocked bronchiole will experience which of the following?

Accepted Answer

Reduced gas exchange in the region supplied by the blocked bronchiole

Question 19

Which of the following is a direct result of the oxidation of glucose during cellular respiration?

Accepted Answer

Release of energy, carbon dioxide, and water

Question 20

A patient with chronic bronchitis has thickened mucus lining their airways. Which of the following is a likely effect on their respiratory system?

Accepted Answer

Reduced airflow and increased risk of infection due to trapped pathogens

Respiration and Gas Exchange in Animals: Structure and Function of the Gas Exchange System

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