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Questions and Answers
Which statement accurately describes the role of the larynx in the respiratory system?
Which statement accurately describes the role of the larynx in the respiratory system?
What is NOT a characteristic associated with pulmonary ventilation?
What is NOT a characteristic associated with pulmonary ventilation?
Which type of cell is responsible for cleaning debris from the alveoli?
Which type of cell is responsible for cleaning debris from the alveoli?
What anatomical feature is essential for the structural integrity of the bronchial tree?
What anatomical feature is essential for the structural integrity of the bronchial tree?
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Which of the following statements about the respiratory membrane is incorrect?
Which of the following statements about the respiratory membrane is incorrect?
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What physiological response is triggered by cooling and wetting the face and nose?
What physiological response is triggered by cooling and wetting the face and nose?
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What is the average duration a person can hold their breath?
What is the average duration a person can hold their breath?
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How does the diaphragm change shape when it contracts?
How does the diaphragm change shape when it contracts?
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Which muscles are primarily responsible for expiration during forced breathing?
Which muscles are primarily responsible for expiration during forced breathing?
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What is the current world record for holding one's breath?
What is the current world record for holding one's breath?
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What happens to air volume in the thorax when there is an increase in thoracic volume?
What happens to air volume in the thorax when there is an increase in thoracic volume?
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Which joint type is found between the ribs and the sternum, specifically at the first rib?
Which joint type is found between the ribs and the sternum, specifically at the first rib?
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What role do accessory muscles play in respiration?
What role do accessory muscles play in respiration?
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What does the contraction of the diaphragm do to the thoracic cavity?
What does the contraction of the diaphragm do to the thoracic cavity?
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Which of the following joints allows for articulation between the thoracic vertebrae and ribs?
Which of the following joints allows for articulation between the thoracic vertebrae and ribs?
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What is the primary function of thoracic joints?
What is the primary function of thoracic joints?
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Which of the following correctly describes the external intercostals?
Which of the following correctly describes the external intercostals?
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During expiration, what occurs with the pressure inside the thorax?
During expiration, what occurs with the pressure inside the thorax?
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What is the characteristic of a costochondral joint?
What is the characteristic of a costochondral joint?
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What occurs when thoracic volume decreases during respiration?
What occurs when thoracic volume decreases during respiration?
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How do the muscles and joints interact during thoracic movement?
How do the muscles and joints interact during thoracic movement?
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What primarily causes the thoracic cavity to expand during normal quiet inspiration?
What primarily causes the thoracic cavity to expand during normal quiet inspiration?
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Which type of muscles primarily contribute to forced expiration?
Which type of muscles primarily contribute to forced expiration?
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What is the role of accessory muscles during forced inspiration?
What is the role of accessory muscles during forced inspiration?
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What happens to the diaphragm during normal quiet expiration?
What happens to the diaphragm during normal quiet expiration?
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What is the main purpose of the internal intercostals during forced expiration?
What is the main purpose of the internal intercostals during forced expiration?
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What is the primary function of the pleural fluid in the thoracic cavity?
What is the primary function of the pleural fluid in the thoracic cavity?
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How does the movement of the thoracic wall affect lung volume during inspiration?
How does the movement of the thoracic wall affect lung volume during inspiration?
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Which of the following describes a pneumothorax?
Which of the following describes a pneumothorax?
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What happens to the lungs during expiration?
What happens to the lungs during expiration?
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What role do the visceral and parietal pleura play in respiration?
What role do the visceral and parietal pleura play in respiration?
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Study Notes
Thoracic Cavity Anatomy
- Thoracic cage: Formed by ribs, sternum, and thoracic vertebrae. Includes sternocostal, costochondral, and interchondral joints; costovertebral, and costotransverse joints.
- Most thoracic joints are synovial, except the first sternocostal joint and costochondral joints, which are cartilaginous.
- Thoracic joints' movement is facilitated by respiratory muscles.
Respiratory Mechanics
- Boyle's Law: Pressure and volume of a gas are inversely related. Increasing thoracic volume decreases pressure, causing air to flow in (inspiration). Decreasing thoracic volume increases pressure, causing air to flow out (expiration).
- Quiet inspiration: Diaphragm contraction (flattens) and external intercostal contraction (lifts ribs).
- Forced inspiration: Above actions plus accessory muscle contraction to further expand the thoracic cavity.
- Quiet expiration: Passive process; diaphragm relaxes (dome shape), external intercostals relax.
- Forced expiration: Internal intercostal contraction (depresses ribs) and accessory muscle contraction to further decrease cavity volume.
Respiratory Muscles
- Primary muscles: Diaphragm and intercostal muscles.
- Diaphragm: Sheet of skeletal muscle separating thorax and abdomen; contraction flattens it, expanding the thoracic cavity and compressing the abdominopelvic cavity.
- External intercostals: Lift rib cage, expanding the thoracic cavity (inspiration—quiet and forced).
- Internal intercostals: Depress rib cage, decreasing thoracic cavity volume (forced expiration only).
- Accessory muscles: Assist in forced inspiration and expiration; specific names not required.
Respiratory Membrane and Cell Types
- Respiratory membrane: Facilitates gas exchange; composed of capillary endothelium, simple squamous epithelium, Type II pneumocytes, and a fused basement membrane.
- Macrophages: Remove debris from alveoli.
Lung Expansion and Pleura
- Pleura: Visceral pleura covers lungs, parietal pleura lines thoracic wall; pleural fluid lubricates and binds lungs to thoracic wall enabling lung expansion.
- Lung expansion and contraction follow changes in thoracic cavity volume due to the pleural linkage.
Breath-Holding and Diving Reflex
- Average breath-holding time: 30-90 seconds.
- Diving reflex: Activated by cooling and wetting face; prioritizes oxygen to heart and brain, extending breath-holding time. Present in infants up to about 6 months.
- World record breath-holding time: 24 minutes 37 seconds (with pure oxygen inhalation).
Pneumothorax
- Air in the pleural space; partial or complete lung collapse; caused by trauma or lung disease.
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Description
Explore the intricate anatomy of the thoracic cavity, including the formation and types of thoracic joints. Understand the mechanics of respiration, including Boyle's Law and the roles of various muscles during inspiration and expiration.
