Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Increased PCO2, temperature, and hydrogen ion concentration all increase Hb's affinity for oxygen.
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22. The Respiratory System
Introduction to Lung Physiology
Multiple Choice
In lung physiology, what is the primary function of the respiratory system?
A
To produce hormones that regulate metabolism and blood calcium levels
B
To filter nitrogenous wastes from the blood and regulate plasma osmolarity
C
To pump blood through the systemic and pulmonary circuits
D
To exchange gases by supplying oxygen to the blood and removing carbon dioxide from the body
Verified step by step guidance1
Step 1: Understand the main role of the respiratory system in the human body. The respiratory system is primarily involved in the process of gas exchange, which is essential for cellular respiration and overall metabolism.
Step 2: Identify the key gases involved in this exchange: oxygen (O\_2) and carbon dioxide (CO\_2). Oxygen is taken into the body to be delivered to cells, while carbon dioxide, a waste product of metabolism, is removed from the body.
Step 3: Recognize that the respiratory system includes structures such as the lungs, alveoli, trachea, and bronchi, which facilitate the movement of air and the diffusion of gases between the air and blood.
Step 4: Differentiate the respiratory system's function from other systems: it does not produce hormones (endocrine system), filter nitrogenous wastes (urinary system), or pump blood (cardiovascular system).
Step 5: Conclude that the primary function of the respiratory system is to exchange gases by supplying oxygen to the blood and removing carbon dioxide from the body, which supports cellular function and maintains homeostasis.
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