Intrapulmonary and Intrapleural Pressures

The visceral and parietal pleurae are normally flush against each other, so that the lungs are stuck to the chest wall in the same manner as two wet pieces of glass sticking to each other. The intrapleural space contains only a film of fluid secreted by the two membranes. The pleural cavity in a healthy person is thus potential rather than real; it can become real only in abnormal situations when air enters the intrapleural space. Since the lungs normally remain in contact with the chest wall, they expand and contract along with the thoracic cavity during respiratory movements.

Air enters the lungs during inspiration because the atmospheric pressure is greater than the intrapulmonary, or intra-alveolar, pressure. Since the atmospheric pressure does not usually change, the intrapulmonary pressure must fall below atmospheric pressure to cause inspiration. A pressure below that of the atmosphere is called a subatmospheric pressure, or negative pressure. During quiet inspiration, for example, the intrapulmonary pressure may decrease to 3 mmHg below the pressure of the atmosphere. This subatmospheric pressure is shown as -3 mmHg. Expiration, conversely, occurs when the intrapulmonary pressure is greater than the atmospheric pressure. During quiet expiration, for example, the intrapulmonary pressure may rise to at least +3 mmHg over the atmospheric pressure.

The lack of air in the intrapleural space produces a sub-atmospheric intrapleural pressure that is lower than the intrapul-monary pressure (table 16.1). There is thus a pressure difference across the wall of the lung—called the transpulmonary (or transmural) pressure—which is the difference between the intrapulmonary pressure and the intrapleural pressure. Since the pressure within the lungs (intrapulmonary pressure) is greater than that outside the lungs (intrapleural pressure), the difference in pressure (transpulmonary pressure) keeps the lungs against the chest wall. Thus, the changes in lung volume parallel changes in thoracic volume during inspiration and expiration.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

Get My Free Ebook


Responses

  • asmarina asfaha
    What is the difference between the intrapulmony and intrapleural pressure?
    7 years ago
  • benjamin
    Why is the intrapleural pressure subatmospheric?
    7 years ago
  • Pamela
    What changes occur in intrapulmonary pressure and intrapleural pressure during expiration?
    7 years ago
  • rossana
    What is the difference between the interapulmonary and interapleural pressures?
    7 years ago
  • leonida
    What is the difference between intrapulmonary pressure and intrapleural pressure?
    7 years ago
  • Abdullah
    What is the difference between intrapulmonary pressure and transpulmonary pressure?
    7 years ago
  • ilta
    Is atmospheric pressure greater in lungs inspiration?
    7 years ago
  • JAYDEN ANDERSON
    When intrapulmonary pressure is lower than atmospheric pressure, air?
    7 years ago
  • Dominik
    Why must intrapleural pressure be lower than intrapulmonary pressure?
    7 years ago
  • esmeralda
    When intrapulmonary pressure is greater than atmosphere you?
    7 years ago
  • Gildo
    How are intrapulmonary & intrapleural pressures related?
    7 years ago
  • Fikru
    What are examples of intrapulmonary pressure?
    7 years ago
  • Iggi Demsas
    What is the pressure in the lung during inspiration?
    7 years ago
  • angela gonzales
    How is subatmospheric intrapleural pressure produced?
    7 years ago
  • PIRKKO
    What is the intrapleural pressure in humans?
    7 years ago
  • Heribald
    Why is intra pleural pressure negative or subatmospheric?
    7 years ago
  • Ross
    What are the intrapulmonary pressures during inspiration?
    7 years ago
  • Kathy
    What is interpulmonary pressure?
    7 years ago
  • peter
    Is expiration when The pressure within the lungs is greater than the atmosphere.?
    7 years ago
  • peter
    When is intrapulmonary pressure negative?
    7 years ago
  • Diamond
    Which is true about intrapulmonary pressure and interpleural pressure?
    7 years ago
  • sanna-leen
    Why intrapleural pressure must stay greater than intrapulmonary?
    7 years ago
  • LUISELLA NAPOLITANO
    What is the difference of the intrapulmonary and intrapleural pressures?
    7 years ago
  • patrizio
    How does pneumothorax occur in intrapulmonary pressure and intrapleural?
    7 years ago
  • PRISCA BOLGER
    Is interpleural pressure lower or equal to intrapulmonary pressure during expiration?
    7 years ago
  • timo
    How does negative intrapleural pressure keeps the lungs expanded?
    7 years ago
  • selma
    WHAT THE PRESSURE RELATIONSHIPS OFINTRAPULMONARY AND INTRAPLEURAL OF THE LUNGS?
    7 years ago
  • Ann
    WHAT ARE THE DIFFERENCES BETWEEN INTRA PULMONARY PRESSURE AND INTRA ALVEOLAR PRESSURE?
    6 years ago
  • tytti
    What is the intrapulmonary pressure during inspiration?
    6 years ago
  • daniela
    What happened to intrapleural pressure during the inspiration?
    6 years ago
  • orlando
    What is intrapulmonary/intraalveolar pressure How does it change with respiration?
    6 years ago
  • mezan eyob
    Is intrapulmonic pressure greather than intrathoraic pressure during inspiration?
    6 years ago
  • kevin
    How do intrapleural and alveolar (intrapulmonary) pressure differ?
    6 years ago
  • KATHARINA FOERSTER
    What is it called when intrapulmonary pressure is greater than atmospheric pressure?
    6 years ago
  • Anna Bohm
    How does intrapulmonary and intrapleural pressure change throughout the respiratory cycle?
    6 years ago
  • chloe
    When intrapleural pressure is equal to intrapulmonary?
    6 years ago
  • aaron
    When intrapulmonary and intraplueral pressure equal eachother what happens?
    6 years ago
  • Francis
    What is the relationship between atmospheric, intrapleural, and intrapulmonary pressure?
    6 years ago
  • kimberly
    Which presuure is smaller, intrapulmonary or intrapleural?
    6 years ago
  • Girma
    What is intrapleural pressure caused by?
    6 years ago
  • rosa
    What is pneumothorax explain how it occurs using the intrapulmonary and pleural pressures?
    6 years ago
  • Marino
    Which pressure normally never become equally atmospheric during expiration?
    6 years ago
  • Jean Kankkunen
    What are the changes in pressure and volume of lungs at the beginning of inspiration?
    6 years ago
  • Reuben
    How do intrapleural pressures change during inspiration and expiration?
    6 years ago
  • Petra Eichel
    Why is intrapleural pressure lower than atmospheric and intrspulmonary pressure?
    6 years ago
  • asmeret
    What is the intrapulmonary pressure during inspiration in mmhg?
    6 years ago
  • Jaana
    Does intrapleural pressure increase during inspiration?
    6 years ago
  • filmon tesfalem
    What happens if interpleural pressure is greater that intrapulmonic?
    5 years ago
  • kyla
    Which volume is greater at expiration intrathoracic or intrapulmonic?
    4 years ago
  • maria
    How does intrapulmonary and intrapleural pressure work together?
    4 years ago
  • semira
    Why does intrapleural pressure have to be lower than intra alveolar?
    3 years ago
  • nebay
    Is intrapleural pressure less than intrapulmonic pressure at the beginning of inspiration?
    3 years ago
  • Antje
    Which is correct about intrapleural and intrapulmonary?
    3 years ago
  • dionisia
    How the pressure in the intra pleural cavity differs from the intrapulmonary pressure?
    3 years ago
  • caroline
    Why is there equality in intrapleural pressure and intrapulmonary pressure at maximum pressure?
    3 years ago
  • Millar
    Is atmospheric pressure lower than intrapleural pressure during exhalation?
    3 years ago
  • Ellena
    Why is intrapleural pressure lower than intrapulmonary presssure?
    3 years ago
  • michelle
    What happens wgen intrapulmonary pressure is higher than intrapleural pressure ?
    3 years ago
  • tauno
    Why in intrapleural space pressure less than otherside?
    3 years ago
  • bessie
    How does intrapulmonary pressure compare to intrapleural pressure?
    3 years ago
  • myla
    Why intrapleural pressure equal subatmospheric pressure in quite breathing?
    2 years ago
  • ali
    Why is intra pleural pressure is less then intra alveolar pressure?
    2 years ago
  • Kenneth
    How does intrapleural pressure change during a quiet breath?
    2 years ago
  • emppu kirvesniemi
    Why is intrapleural pressure negative rather than positive?
    2 years ago
  • niklas
    What is the difference between intrapulmonary and intraalveolar?
    2 years ago
  • Medoro
    What is the difference between intrapleural cavity and intra pulmonary cavity?
    2 years ago
  • timotea
    How does intrapleural and intrapulmonary pressures change during the respiratory cycle?
    2 years ago
  • Bibiana
    What occurs if intrapulmonary pressure is 765 mm Hg?
    2 years ago
  • Anja
    What is the normal range of intrapulmonary pressure in humans?
    2 years ago
  • barbara
    Does intrapulmonary pressure fall duringvrespiration?
    2 years ago
  • GAVIN
    Does intrapleural pressure exceed intra alveolar pressure in normal people?
    2 years ago
  • annett
    What happen in interpleural pressure during inspiration?
    2 years ago
  • gianni
    What is intrapleural pressure and its significance?
    2 years ago
  • ayla allan
    How is negative intrapulmonary pressure established?
    2 years ago
  • georgina
    Why intrapleura pressure is higher than intraalveolar pressure?
    2 years ago
  • antti
    What is the difference between intra pulmonary pressure and intra pleural pressure?
    2 years ago
  • Jonas
    What happens when the intrapleural pressure is greater than alveolar pressure?
    2 years ago
  • Marja
    What happens if the intrapleural pressure is greater than intraalveolar pressure?
    2 years ago
  • ISABELLA CLARK
    What happens to the lungs when intrapleural pressure is greater than intraalveolar pressure?
    2 years ago
  • Astolfo
    What happens if pulmonary pressure and atmospheric pressure is nit equal?
    2 years ago
  • Sarah
    Why intrapleural pressure is more negative than intrapulmonary pressure?
    2 years ago
  • patrick loewe
    Why must the intra pleural pressure be lower than the alveolar pressure?
    2 years ago
  • rose
    Why should the alveoli pressure be greater than pleurae pressure?
    2 years ago
  • claudia
    Why pleura pressure is lower than alveolar pressure?
    2 years ago
  • BRANDON
    What happens if the alveoli pressure is less than the intrapulmonary pressure?
    2 years ago
  • nebay afwerki
    What will happen to the lung if the intrapleural pressure is greater than intrapulmonary pressure?
    2 years ago
  • jackeline
    Why is pulmonary pressure greater than intrapleural pressure?
    2 years ago
  • yvonne fiedler
    What happens to the lung when alveolar pressure is lesser than pleural pressure?
    2 years ago
  • Elanor
    What will happen to the lungs if the intrapleural pressure is greater to the alveolar pressure?
    2 years ago
  • anette
    What will happen when the intra pleural pressure is greater than intrapulmonary pressure?
    2 years ago
  • preston johnson
    When intrapleural pressure is greater than intra alveolar, what happens to the lungs?
    2 years ago
  • CHICA
    Is intrapleural and pleural pressure same?
    2 years ago
  • rasmus
    Is intrapleural pressure ever higher than atmospheric pressure?
    2 years ago
  • robert
    Why is intrapleural pressure slightly lower than intrapulmonary pressure?
    2 years ago
  • PUPETTA
    What is intra pulmonic pressure?
    2 years ago
  • Tullio Padovesi
    Why interpleural pressure is lower than in the thoracic cavity and atmospheric pressure?
    2 years ago
  • GARRETT
    When intra pulmonary pressure falls?
    1 year ago
  • PAULA
    Why intrapleuronic pressure less than intrapulmonary pressure?
    1 year ago
  • MOHAMED MOORE
    How negative pressure produce in the intrapleural space important?
    1 year ago
  • lewis
    Does loss of interpulmonary pressure?
    1 year ago
  • jeffrey
    When intrapulmonary pressure is 1 mmHg below atmospheric pressure , you will:?
    1 year ago
  • Dominik
    What is the intrapulmonary pressure during inspiration and expiration?
    1 year ago
  • KATRI
    How does intra pleural and intraalveolar pressure vary?
    1 year ago
  • segan
    How does intrapulmonary pressure vary during inspiration?
    1 year ago
  • brody
    Why during inspiration intra pleural pressure decrease?
    1 year ago
  • Barbara
    Why their is negative intra plural pressure in lungs?
    11 months ago
  • mikaela
    Does intrapulmonary pressure become positive on forced expiration?
    9 months ago
  • janina
    What is the relationship among the intrapulmonary intrapleural and atmospheric pressures?
    9 months ago
  • erica
    Why is transpulmonary pressure negative?
    9 months ago
  • ilkka
    Why increase in pleural pressure lead to decrease in intrapulmonary pressure?
    8 months ago
  • Robert
    How do changes in intrapleural pressure influence intrapulmonary pressure?
    8 months ago
  • skye
    Why is intrpleural pressure always lower than intrpulmonary pressure?
    8 months ago
  • Madihah Goytiom
    Why the intrathoracic pressure should be lower than atmopheric pressure?
    8 months ago
  • haben bisrat
    Why it is important the intrathoracic pressure should be lower than atmopheric pressure?
    8 months ago
  • seth
    Are intrapulmonary and transmural pressure the same?
    7 months ago
  • EETU
    Why intrapleral pressure change is more compare to the intra alveolar pressure during respiration?
    7 months ago
  • James Cunningham
    Which of the following could be responsible for an increase in intrapulmonary pressure?
    7 months ago
  • adalberto
    When in respiratory cycle the intraalveolar pressure equalizes the atmospheric pressure?
    5 months ago
  • liberata
    What is ve interapulmonary pressure?
    5 months ago
  • susanna pohjamo
    Why intrapleural pressure is lower than intraalveolar pressure?
    5 months ago
  • aki-petter
    Is pleural pressure the same as intrathoracic pressure?
    4 months ago
  • Carmen Baresi
    How is the intrapulmonary pressure when pulling the membrane down anatomy?
    4 months ago
  • zufan
    How the body create a diference between asmospheric pressure and intrapulmonar presuure?
    3 months ago
  • petros
    What is intrapleural pressure medical terminalligy?
    3 months ago
  • meaza
    What is negative intra pulmonary pressure?
    3 months ago
  • marko waechter
    What happens to the intrapleural transpulmonary and alveoli during inspiration and expiration?
    2 months ago
  • james
    How is intrapulmonary pressure expressed?
    2 months ago
  • mika-matti
    How does body create difference between atmospheric and intrapulmonary pressure?
    2 months ago
  • kenneth
    When is the transpulmonary pressure the same as intrapleural?
    2 months ago
  • Gringamor
    What is the relationship between lung volume and inteapmonary pressure during inspiration?
    2 months ago
  • corrado
    How are the measures of intrapulmonary and intrapleural pressure related?
    1 month ago
  • maggie
    What happens to intrapleural pressure and alveloar pressure during hiccups?
    1 month ago
  • karolin
    When is intrapleural pressure lowest?
    1 month ago
  • Katie
    How does the intrapleural pressure compare to the intrapulmonary (intralveolar) pressure?
    1 month ago
  • ponto
    What happens to intrapulmonary pressure during autoPEEEP?
    1 month ago
  • kaiju
    What is normal intrathoracic pressure during expiration?
    29 days ago
  • santeri
    Why is intrapulomary pressure negative on inspiration?
    29 days ago
  • gringamor
    When is intrapulmonary pressure at its lowest?
    28 days ago
  • doreen
    What happens to the intrathrotaic pressure and the intralveolar pressure during inspiration?
    24 days ago
  • Edward
    Why intrapulmonary pressure is high?
    15 days ago
  • v
    Why are intrapleural pressures negative?
    3 days ago

Post a comment