2006-09-23 19:33:25 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Medicine
During inspiration the intrathoracic pressure must decrease to cause external air to enter.
2006-09-23 19:38:05 · answer #1 · answered by syrious 5 · 1⤊ 0⤋
Intrathoracic Pressure
2016-11-12 05:44:26 · answer #2 · answered by haper 4 · 0⤊ 0⤋
During inspiration the intrathoracic pressure (or ITP) decreases so the air moves from a medium of higher pressure (the atmosphere) in a region of lower pressure (the lungs). This mechanism is used in a procedure called as the Müller's Maneuver where the patient/subject is ask to inspire forcefully against a closed glottis so that the ITP remains decreased and the closed glottis inhibits air from entering the lungs and thus maintains the low ITP. The blood vessels thus get dilated due to the surrounding low pressure and this is useful in studying the great veins (the SVC and IVC) and the great arteries(aorta, carotids and brachiocephalic). Hope my answer helps you.
2006-09-24 20:24:47 · answer #3 · answered by labyrinth 3 · 0⤊ 0⤋
During inspiration, the ribs move in a bucket handle motion, in that they move both up and out. The diaphram going down, and the intrathoracic pressure decreases, thus causing a vaccum, and air enter the lungs, providing oxygen.
2006-09-24 06:43:52 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Inhalation is the movement of air from the external environment, through the airways, into the alveoli during breathing.
Inhalation begins with the onset of contraction of the diaphragm, which results in expansion of the intrapleural space and an increase in negative pressure according to Boyle's Law. This negative pressure generates airflow because of the pressure difference between the atmosphere and alveolus. Air enters, inflating the lung through either the nose or the mouth into the pharynx (throat) and trachea before entering the alveoli.
2006-09-23 21:54:53 · answer #5 · answered by gangadharan nair 7 · 2⤊ 1⤋
The pressure decreases
2006-09-23 21:10:35 · answer #6 · answered by Missy 2 · 0⤊ 0⤋
My guess is that pressure increases since more air is in the lungs during inspiration. Pressure decreases on expiration.
2006-09-23 19:43:17 · answer #7 · answered by JD 2 · 0⤊ 2⤋
Decreases.
2006-09-23 23:18:34 · answer #8 · answered by J.SWAMY I ఇ జ స్వామి 7 · 0⤊ 0⤋
Intrathoracic pressure only changes if the lungs are damaged and let air into the pulmonary cavity.
2006-09-24 02:11:58 · answer #9 · answered by Anonymous · 0⤊ 0⤋
Hi,
Intrathoracic pressure decreses (In fact it becomes negative with respect to atmosphere) during inspiration..
2006-09-24 08:11:01 · answer #10 · answered by doc_amarendra 1 · 0⤊ 0⤋