Q: Which equation correctly represents cellular respiration?

$$C_6H_{12}O_6$ + O_2$ \rightarrow CO_2$ + H_2O + ATP + \text{Heat}$$

Question 1

Which of the following is NOT a primary function of the respiratory system?

Accepted Answer

Regulation of blood pressure via renin secretion

Question 2

Which process describes the movement of air between the atmosphere and the lungs?

Accepted Answer

Ventilation

Question 3

During external respiration, which of the following steps occurs FIRST?

Accepted Answer

Movement of air between the atmosphere and the lungs

Question 4

Which equation correctly represents cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + O_2$ ightarrow CO_2$ + H_2O + ATP + 	ext{Heat}$$

Question 5

Which structure is primarily responsible for gas exchange in the lungs?

Accepted Answer

Alveoli

Question 6

What is the main function of surfactant in the alveoli?

Accepted Answer

Disrupt hydrogen bonds to reduce surface tension

Question 7

According to the Law of LaPlace, what happens to the inward pressure ($$P) in an $$alveolus as its radius ($$r) $$decreases, assuming surface tension ($$T) $$remains constant?

Accepted Answer

$$P$$ increases

Question 8

Which cell type in the alveoli produces surfactant?

Accepted Answer

Type II alveolar cell

Question 9

A patient has difficulty keeping their lungs inflated due to a puncture in the pleural membrane. What is the most likely physiological consequence?

Accepted Answer

Collapse of the affected lung (pneumothorax)

Question 10

Which of the following best describes the role of the pleural fluid?

Accepted Answer

It acts as a lubricant and helps 'stick' the lungs to the chest wall

Question 11

Which anatomical feature allows the left lung to have fewer lobes than the right lung?

Accepted Answer

Cardiac notch for the heart

Question 12

Which muscle is primarily responsible for increasing thoracic volume during inspiration?

Accepted Answer

Diaphragm

Question 13

What is the effect of bronchoconstriction on airflow?

Accepted Answer

It decreases airflow to the alveoli

Question 14

Which of the following best explains why alveoli are closely associated with capillaries?

Accepted Answer

To promote efficient gas exchange

Question 15

Boyle's Law states that pressure ($$P) is $$inversely proportional to volume ($$V). $$Which equation represents this relationship?

Accepted Answer

$$P \propto \frac{1}{V}$$

Question 16

Which of the following is a consequence of increased surface tension in the alveoli?

Accepted Answer

Alveoli are more likely to collapse

Question 17

A newborn with insufficient surfactant production is at risk for which condition?

Accepted Answer

Respiratory distress syndrome

Question 18

Which of the following best describes the respiratory membrane?

Accepted Answer

Type I alveolar cell, basement membrane, and capillary endothelium

Question 19

If the radius of an alveolus is halved and surface tension remains constant, what happens to the inward pressure according to the Law of LaPlace ($$P = \frac{2T}{r}$$)?

Accepted Answer

It is doubled

Question 20

Which of the following structures is NOT part of the conducting airways?

Accepted Answer

Alveoli

Structure and Function of the Respiratory System

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