محاضره 8
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Transcript of محاضره 8
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►It is about 16 cycles per
minute.
►It is composed of:
a)Inspiration.
b) Expiration.
c) Expiratory pause.
►It is about 16 cycles per
minute.
►It is composed of:
a)Inspiration.
b) Expiration.
c) Expiratory pause.
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1)Supply of O2 to tissues and
removal of CO2 from them.
2)Regulation of PH of the blood.
3)Excretion of water vapour.
4)Regulation of body
temperature.
5)Help voice production.
1)Supply of O2 to tissues and
removal of CO2 from them.
2)Regulation of PH of the blood.
3)Excretion of water vapour.
4)Regulation of body
temperature.
5)Help voice production.
![Page 4: محاضره 8](https://reader033.fdocuments.in/reader033/viewer/2022061111/5455cf6caf7959d8748b9cd1/html5/thumbnails/4.jpg)
I)Peripheral
mechanism.
II)Central mechanism.
I)Peripheral
mechanism.
II)Central mechanism.
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A) Mechanics of inspiration:
1. The thoracic cavity increases in all
directions:
a) Vertically: by contraction of the
diaphragm and its descent 1.5 cm.
b) Transversely: by elevation of the ribs by
contraction of external intercostal musclesc) Antero-posteriorly: by elevation of the ribs, movement of the sternum.
•
A) Mechanics of inspiration:
1. The thoracic cavity increases in all
directions:
a) Vertically: by contraction of the
diaphragm and its descent 1.5 cm.
b) Transversely: by elevation of the ribs by
contraction of external intercostal musclesc) Antero-posteriorly: by elevation of the ribs, movement of the sternum.
•
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2. Expansion of the thoracic cavity
leads to increases the negativity
of the intrapleural pressure
leading to distension of the lungs
cause rush of 500 c.c. of
atmospheric air into the lungs.
2. Expansion of the thoracic cavity
leads to increases the negativity
of the intrapleural pressure
leading to distension of the lungs
cause rush of 500 c.c. of
atmospheric air into the lungs.
![Page 7: محاضره 8](https://reader033.fdocuments.in/reader033/viewer/2022061111/5455cf6caf7959d8748b9cd1/html5/thumbnails/7.jpg)
B) Mechanics of expiration:
Quiet expiration is a passive process, it is done by:
1) Relaxation of inspiratory muscles (diaphragm and external intercostal muscles).
2) Drop of the thoracic cage by its weight.
3) Elastic recoil of the lung.
This pushes 500 c.c. of air out of the lung.
B) Mechanics of expiration:
Quiet expiration is a passive process, it is done by:
1) Relaxation of inspiratory muscles (diaphragm and external intercostal muscles).
2) Drop of the thoracic cage by its weight.
3) Elastic recoil of the lung.
This pushes 500 c.c. of air out of the lung.
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Definition:
It is the pressure inside the
pleural sac.
►It is always negative
(subatmospheric) during normal
resting respiratory cycle.
Definition:
It is the pressure inside the
pleural sac.
►It is always negative
(subatmospheric) during normal
resting respiratory cycle.
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a) Over growth of the
thoracic cage than the
lung.
b) Elastic recoil of the
lung against chest wall.
a) Over growth of the
thoracic cage than the
lung.
b) Elastic recoil of the
lung against chest wall.
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a) During normal expiration I.P.P. is -3 mmHg.b) During normal inspiration I.P.P. is -6 mmHg.c) During forced inspiration I.P.P. is -30 mmHg.d) During forced expiration the I.P.P. is + 40 mmHg.
a) During normal expiration I.P.P. is -3 mmHg.b) During normal inspiration I.P.P. is -6 mmHg.c) During forced inspiration I.P.P. is -30 mmHg.d) During forced expiration the I.P.P. is + 40 mmHg.
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1) It helps the expansion of the lungs during inspiration.2) It helps the venous return from the extrathoracic veins. 3) It helps flow of lymph from extrathoracic lymph vessels.4) It helps flow of blood through the pulmonary vessels. 5) It is a measurement of elastic recoil of the lung.
1) It helps the expansion of the lungs during inspiration.2) It helps the venous return from the extrathoracic veins. 3) It helps flow of lymph from extrathoracic lymph vessels.4) It helps flow of blood through the pulmonary vessels. 5) It is a measurement of elastic recoil of the lung.