📄 النص الكامل للصفحة
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4. فسر ما يأتي:
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5. صف التكامل بين عمل الجهاز الدوري والجهاز التنفسي عند بذل مجهود.
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6. مستعينا بالشكل أدناه فسر سبب تعرض الأطفال الذين يولدون قبل نهاية فترة الحمل إلى مشاكل صحية في التنفس.
313
وزارة التعليم
Ministry of Education
2023 - 1447
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**FIGURE**: حويصلات هوائية طبيعية وحويصلات هوائية متضررة
Description: The figure consists of two main parts, side-by-side, each showing a simplified human torso with lungs, and a magnified inset of alveolar sacs. Both parts are presented against a light blue background within a larger white box.
**Left Side (Normal Alveolar Sacs):**
- **Upper Image:** A simplified anatomical drawing of a human torso, showing the rib cage and the two lungs. The lungs appear healthy, fully developed, and symmetrical. The trachea branches into bronchi leading to each lung.
- **Lower Inset (Magnified):** A detailed diagram labeled 'حويصلات هوائية طبيعية' (Normal alveolar sacs). This shows a cluster of numerous, distinct, spherical, and thin-walled sacs, resembling a healthy bunch of grapes. Each sac is clearly defined, open, and appears to have a large internal volume and surface area, indicating optimal conditions for gas exchange. The sacs are depicted in a pinkish-red color.
**Right Side (Damaged Alveolar Sacs):**
- **Upper Image:** A simplified anatomical drawing of a human torso, similar to the left, showing the rib cage and lungs. The lungs here appear slightly less defined, potentially smaller, or less robust than the normal lungs, suggesting underdevelopment or damage.
- **Lower Inset (Magnified):** A detailed diagram labeled 'حويصلات هوائية متضررة' (Damaged alveolar sacs). This shows a cluster of alveolar sacs that are visibly different from the normal ones. The sacs appear to have thicker walls, are less spherical, and some seem partially collapsed, fused, or irregularly shaped. The overall structure looks less organized, with reduced open space within the sacs, implying a significantly reduced surface area for efficient gas exchange. The color is also pinkish-red, but the texture and morphology suggest inflammation, immaturity, or damage.
**Comparison:** The normal alveolar sacs are characterized by their numerous, open, and thin-walled structure, maximizing the surface area for gas exchange. In contrast, the damaged sacs are depicted as having thicker walls, being less distinct, and potentially collapsed or malformed, indicating impaired respiratory function. This visual contrast is crucial for understanding the physiological basis of respiratory problems, particularly in contexts like premature birth where lung development is incomplete.
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Context: This figure visually explains the structural differences between healthy and compromised alveolar sacs. It serves as a critical visual aid for understanding why conditions affecting lung development, such as premature birth, can lead to severe respiratory health problems due to inefficient gas exchange caused by underdeveloped or damaged alveoli.