Pearson eText Human Anatomy & Physiology -- Instant Access (Pearson+)
Pearson eText Human Anatomy & Physiology -- Instant Access (Pearson+)
2nd Edition
ISBN: 9780136873822
Author: Erin Amerman
Publisher: PEARSON+
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Chapter 21, Problem 1CYR

Which of the following are functions of the respiratory system? Circle all that apply.

a. Providing for speech

b. Regulating the autonomic nervous system

c. Maintaining the acid-base balance of the blood

d. Temperature homeostasis

e. Raising the pressure in the abdominopelvic cavity

f. Assisting in blood pressure regulation

Expert Solution & Answer
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Summary Introduction

Introduction:

The primary function of the respiratory system is a gaseous exchange between the body and the atmosphere. Lungs are the primary organs where this gaseous exchange occurs. This gaseous exchange leads to body tissues getting oxygen for performing metabolic reactions and releasing carbon dioxide as waste.

Answer to Problem 1CYR

Correct answer:

The respiratory system helps in speech, maintaining the acid–base balance of the blood, raising the pressure in the abdominopelvic cavity, and assisting in blood pressure regulation.

Explanation of Solution

Explanation for the correct answer:

Option (a)  states that the respiratory system is responsible for producing speech. The larynx, an organ of respiratory system, houses vocal cords that are responsible for the production of sound. Vocal cords or vocal folds are essentially folding of the mucosal lining of the larynx. The core of the vocal cords has vocal ligaments and sound is produced as the air passes through vocal ligaments, which vibrate to produce sound. Hence, option (a) is correct.

Option (c)  states that the respiratory system maintains acid–base balance of the blood. An important mechanism to maintain pH of the blood is by chemical-based buffer systems. The most important buffer system of blood is carbonic acid-bicarbonate buffer system. The primary source of carbonic acid and bicarbonate ions in blood is carbon dioxide. When the amount of carbon dioxide in the blood increases, the pH of the blood decreases (acidity increases). Respiratory system, being responsible for exhaling the carbon dioxide, assists in the maintenance of blood pH.  Hence, option (c) is correct.

Option (e)  states that the respiratory system raises the pressure in the abdominopelvic cavity. The respiratory system deals with breathing that eventually leads to gaseous exchange. Upon holding breath, the diaphragm rises above and the pressure in the abdominopelvic cavity increases. This pressure helps to expel out things in the cavity during urination, defecation, and childbirth. Hence, option (e) is correct.

Option (f)  states that the respiratory system assists in blood pressure regulation. Capillaries in the lungs are responsible for the production of an enzyme that synthesizes angiotensin-II, a vasoconstrictor, thereby regulating blood pressure. Hence, option (f) is correct.

Explanation for the incorrect answers:

Option (b) states that the respiratory system controls the autonomous nervous system. However, the autonomous nervous system controls bronchial smooth muscles to regulate respiration. So, it is an incorrect option.

Option (d) states that the respiratory system helps in temperature homeostasis. Temperature homeostasis, in humans, is a function of the brain, skin, and circulatory system. So, it is an incorrect option.

Hence, options (b)  and  (d)  are incorrect.

Conclusion

Therefore, it can be concluded that functions of the respiratory system are to produce speech, maintenance of an acid–base balance of the body, increasing the pressure of the abdominopelvic cavity, and regulation of blood pressure. These functions are performed along with the gaseous exchange that is the main function of the respiratory system.

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Chapter 21 Solutions

Pearson eText Human Anatomy & Physiology -- Instant Access (Pearson+)

Ch. 21.2 - How does the epithelium of the bronchial tree...Ch. 21.2 - Trace the pathway from the primary bronchi to the...Ch. 21.2 - 7. What structures make up the respiratory...Ch. 21.2 - Explain the structure of the pleural cavities.Ch. 21.3 - What drives the movement of gases?Ch. 21.3 - Prob. 2QCCh. 21.3 - 3. What drives the movement of gases during...Ch. 21.3 - What does the intrapleural pressure prevent under...Ch. 21.3 - 5. How are inspiration and expiration achieved? Ch. 21.3 - 6. What is airway resistance? What is the main...Ch. 21.3 - How does surfactant decrease surface tension?Ch. 21.3 - 8. What is pulmonary compliance? What three...Ch. 21.3 - 9. What are three measurable pulmonary volumes? Ch. 21.3 - 10. What is the vital capacity? Ch. 21.4 - 1. How does the pressure gradient between two gas...Ch. 21.4 - Prob. 2QCCh. 21.4 - 3. What takes place during pulmonary gas...Ch. 21.4 - Prob. 4QCCh. 21.4 - Prob. 5QCCh. 21.4 - What are three factors that influence the...Ch. 21.5 - How is the majority of oxygen transported through...Ch. 21.5 - How do temperature, pH, PCO2, and BPG affect Hbs...Ch. 21.5 - 3. Why is the S shape of the oxygen-hemoglobin...Ch. 21.5 - What are the three ways in which the body...Ch. 21.5 - Prob. 5QCCh. 21.5 - Prob. 6QCCh. 21.6 - 1. Which steps of respiration rely on partial...Ch. 21.7 - 1. Which collection of neurons generates the...Ch. 21.7 - What are the functions of the dorsal and ventral...Ch. 21.7 - 3. Where are the central chemoreceptors located?...Ch. 21.7 - What do the central chemoreceptors trigger if...Ch. 21.7 - Prob. 5QCCh. 21.8 - 1. What are the differences between obstructive...Ch. 21.8 - 2. What are the three subtypes of COPD? What is...Ch. 21.8 - Prob. 3QCCh. 21 - Which of the following are functions of the...Ch. 21 - Prob. 2CYRCh. 21 - 3. Mark the following statements as true or false....Ch. 21 - Prob. 4CYRCh. 21 - 5. Fill in the blanks: The structures that vibrate...Ch. 21 - Prob. 6CYRCh. 21 - Prob. 7CYRCh. 21 - Prob. 8CYRCh. 21 - Match each term with the correct definition....Ch. 21 - Prob. 10CYRCh. 21 - Which of the following does not affect the...Ch. 21 - Prob. 12CYRCh. 21 - Fill in the blanks: When the alveolar PO2...Ch. 21 - Prob. 14CYRCh. 21 - Match the following terms with the correct...Ch. 21 - 16. Fill in the blanks: Hyperventilation causes...Ch. 21 - The basic rhythm for breathing is maintained by...Ch. 21 - Prob. 18CYRCh. 21 - Prob. 19CYRCh. 21 - Prob. 20CYRCh. 21 - Prob. 1CYUCh. 21 - Prob. 2CYUCh. 21 - Prob. 3CYUCh. 21 - Prob. 4CYUCh. 21 - 1. When a person hyperventilates, what happens to...Ch. 21 - Prob. 2AYKACh. 21 - Prob. 3AYKACh. 21 - Prob. 4AYKACh. 21 - 5. Mrs. Jordan is brought to the emergency room by...Ch. 21 - What happens to the metabolic rate of skeletal...
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