Textbook Question
Differentiate clearly between minute ventilation and alveolar ventilation rate
Which provides a more accurate measure of ventilatory efficiency, and why?
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Ch. 22 The Respiratory System
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System10
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton11
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity28
- Ch. 14 The Autonomic Nervous System18
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart22
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses29
- Ch. 22 The Respiratory System20
- Ch. 23 The Digestive System30
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System25
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System23
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook
Chapter 21, Problem 15
Briefly explain the anatomical 'reason' why most men have deeper voices than boys or women.
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Understand that the pitch of a voice is determined by the vibration frequency of the vocal cords, which is influenced by their length, thickness, and tension.
Recognize that during puberty, males experience a surge in testosterone, which causes the larynx (voice box) to grow larger and the vocal cords to lengthen and thicken.
Note that the longer and thicker vocal cords vibrate at a lower frequency, producing deeper sounds compared to shorter and thinner vocal cords found in boys or women.
Consider the anatomical structure of the larynx, which becomes more prominent in males after puberty, often visible as the 'Adam's apple,' further contributing to voice changes.
Understand that these changes are part of secondary sexual characteristics influenced by hormonal differences, specifically the higher levels of testosterone in males.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Laryngeal Anatomy
The larynx, or voice box, is a key structure in voice production. In men, the larynx is typically larger and has a longer vocal fold length compared to women and boys. This anatomical difference contributes to a deeper pitch, as longer vocal folds vibrate at lower frequencies.
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Hormonal Influence
Testosterone plays a significant role in the development of male vocal characteristics. During puberty, increased levels of testosterone lead to the growth of the larynx and vocal cords, resulting in a deeper voice. This hormonal change is less pronounced in females and prepubescent boys.
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Resonance and Vocal Tract Length
The length and shape of the vocal tract also affect voice pitch. Men generally have longer vocal tracts than women and boys, which enhances the resonance of lower frequencies. This anatomical feature contributes to the overall depth and richness of the male voice.
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Related Practice
Textbook Question
In mouth-to-mouth artificial respiration, the rescuer blows air from his or her own respiratory system into that of the victim. Which of the following statements are correct?
(1) Expansion of the victim's lungs is brought about by blowing air in at higher than atmospheric pressure (positive-pressure breathing).
(2) During inflation of the lungs, the intrapleural pressure increases.
(3) This technique will not work if the victim has a hole in the chest wall, even if the lungs are intact.
(4) Expiration during this procedure depends on the elasticity of the alveolar and thoracic walls.
a. All of these
b. 1, 2, 4
c. 1, 2, 3
d. 1, 4
Textbook Question
The bulk of carbon dioxide is carried:
a. Chemically combined with the amino acids of hemoglobin as carbaminohemoglobin in the red blood cells
b. As the ion HCO₃⁻ in the plasma after first entering the red blood cell
c. As carbonic acid in the plasma
d. Chemically combined with the heme portion of Hb
Textbook Question
Define hyperventilation
If you hyperventilate, do you retain or expel more carbon dioxide?
What effect does hyperventilation have on blood pH?
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Textbook Question
A member of the 'Blues' gang was rushed into an emergency room after receiving a knife wound in the left side of his thorax. The diagnosis was pneumothorax and a collapsed lung. Explain exactly
Why the lung collapsed?
Why only one lung (not both) collapsed?
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Textbook Question
A baby holding its breath will:
a. Have brain cells damaged because of low blood oxygen levels
b. Automatically start to breathe again when the carbon dioxide levels in the blood reach a high enough value
c. Suffer heart damage because of increased pressure in the carotid sinus and aortic arch areas
d. Be called a 'blue baby'