Respiratory System 4, Pressure changes during breathing

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Every time I watch your videos I am amazed at how you manage to take complicated processes and make them easy to understand! You’re wonderful and I thank you so much for giving me the confidence that I can achieve my goals if I just keep working hard!!!! Sometimes you need something explained in a way you can understand 😊Thank you, please keep posting!

[@umaimahnawaz7318]

Dear dr...after i watched your video i was able to breathe a sigh of relief...and as i did it...i was aware of how the pressure in my lungs was changing. bless your kindness and generosity you wonderful man. love you and everything you have done for the world. i sit here and i think...I finally understand.

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Thank you Dear Doctor John Campbell for this beautiful teaching. You have made some of the most complex cocepts so simple. I was struggling to understand for days. I tried reading through many resources but it is your teachinf that truly enlightened my eyes of understanding. Im in tears as I write this. You are a blessing sent by God. I aspire to teach my students in the future with such simplicity as how you have taught me whilst im a medical student

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I took more deep breath while watching this video. Thank you!

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This is a more concise explanation than any biology textbook or article I've read. Great video for the layman.

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Great explanation, thanks!! Greetings from Argentina.

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That makes so much more sense now, thank you :))

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Dr john Campbell sir sn excellent piece of information thanks 27/04/2021

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Every time I do the respiratory system I come back to this video

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Dr. John. I think people should also be aware of the potential dangers of touching mail, mail boxes, and packages that may have been handled by someone who has the infection.

[@chochee07]

Great explanation

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[@sayantandutta6712]

Dr.John Campbell ,will you please explain how intrapleural pressure prevents lung collapse?Thank you so much Dr.

[@1-nd1es]

Lungs consist of elastic tissue and have a high tendency to recoil and become smaller to achieve their normal volume which is actually less than the volume they occupy inside the chest. Being attached to a membrane (visceral pleura covering the outer surface of the lungs) that continuously moves with the change in the chest size that is also lined by the parietal pleura) will prevent the lungs to collapse. Because of the potential space between the visceral pleura and parietal pleura, they follow each other in terms of size change either expanding (active contraction of the external intercostal muscle and diaphragm) or compressing by lungs recoiling (passive). Lungs tend to recoil -- the sticky bilayer pleura membranes pull each other out and in to maintain the functional residual capacity of the lungs. Lungs must have a specific amount of air that cannot be exhaled out during vigorous expiration to provide a continuous gas exchange between alveoli and blood capillaries at the cellular level, unlike the respiration cycle which has a resting stage between inspiration and expiration.

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Dr. John Campbell thank you for doing this sir, It s such an amazing work! can’t wait for the bone formation/Growth video if you still have it in your mind and have time to do it sir.

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I'm waiting for "the bones" as well

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[@riteshchaurasia8538]

How does intra pleural pressure becomes more negative during inhalation..?when the lung expand the space between intra pleural space too increases..then how it goes more negative ..plz kindly explain..indeed great explanation the for it

[@VinayKumar-kk7ig]

another question similar to this ...: how is the -4 mmHg Pressure existence is considered ?? is it common across all ages ?? appreciate if there is any reference video specific to this area

[@busras8265]

thank you sir

[@victoriaporter6586]

thank you!

[@onahemmanuelaugustine9950]

Dr, please can you explain to me more about what makes the pressure negative? Can a pressure be negative? Again, you explained that on a normal condition the Lungs (with the visceral pluralmembrane) always move with the parietal pluralmembrane because both are socked to each on account of the interplurall fluid. If it is then the case they they always move together, when does the negative pressure occur? On a normal condition, given your explanation, they are prevented from pulling apart because of the interplural fluid.

[@1-nd1es]

"Negative pressure generally refers a place where pressure is smaller in one place relative to another place. It doesn't refer to the actual or static pressure being negative since that cannot go lower than zero." relative to the interpulmonary pressure the intrapleural pressure is less so it is negative. and the pressure in the lungs becomes negative also during inspiration relative to the atmospheric pressure to allow the gas particles to go in from high pressure outside to low pressure inside (simple passive transport: diffusion of fluids).

[@nikitabt2177]

Thank you sir, this video is very useful for me😊 *Sir, can you make a video on menstrual cycle*

[@Campbellteaching]

I have already, I posted it a few months ago, try a youtube search using campbellteaching menstural

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@@Campbellteaching ok sir, I just go and search

[@Campbellteaching]

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[@nikitabt2177]

@@Campbellteaching Sorry for late reply Actually I am a bit busy because of my study, But what is this video about? :)

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4:42 external coastal or internal coastal??

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Hello , Dr could you teach us about heart failure ?

[@Campbellteaching]

yes, I have already uploaded a video series on this topic, search under 'heart failure campbellteaching'

[@Campbellteaching]

let me know if you cant find the series

[@eingphengbouy2041]

Thank so much doctor

[@Campbellteaching]

@@eingphengbouy2041 This is the first video on the series, kzbin.info/www/bejne/hZjEiYSHiNGNr7s

[@의사-l7f]

Both the lungs are not of same size right?

[@khadijahakinsanya7668]

1.D 2.C 3.A 4.A 5.D 6.C 7.A 8.C I hope am correct sir

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No my friend...

[@lolagurl007]

Hi Dr. Campbell you might already explain or have a video on ABG and VBG. I’m having a hard time connecting the dots. Why would VBG numbers are slightly higher than ABG?

[@Campbellteaching]

VBG has lower pO2 and higher pCO2 compared to ABG

[@stephanitolbert167]

I completed the questions and I have answers but unsure if they are correct; I went with 4mmHg for first answer. How do I find out if I am correct or not?

[@lucaspooks7401]

Hello Dr. Cambell. I would like to talk to you because I have Cerebral Palsy. I also have Paroxysmal Supra Ventricular Tachychardia. I was just wondering if my PSVT can be dangerous for me. I learned about a Valsalva Maneouver when i breathe in an empty glass. Then I somehow lift my legs up on my sofa and it kills the PSVT. I have to repeat it a few times and then it stops.

[@Campbellteaching]

I have seen the manoeuvre you describe work. Have you got a cardiologist who can advise you on your condition and what is the best treatment?

[@MuhammadAhsan-mp8hq]

Why IP changes from -4 to -6

[@1-nd1es]

Pressure changes that facilitate breathing. Answer all of the following MCQs and leave your answers in the comments section for marking. During exhalation and before the onset of inhalation the intrapleural pressure is; Pressure in the lungs is greater than atmospheric pressure, the intrapleural pressure is always negative relative to the intrapulmonary pressure by 4 mmHg. a. 0 mm Hg intrapleural ✏ b. 2 mm Hg c. 4 mm Hg. intrapulmonary d. 6 mm Hg During inhalation the intrapleural pressure is; a. 0 mm Hg b. 2 mm Hg c. 4 mm Hg d. 6 mm Hg (negative 6). ✏ Which of the following is an accessory muscle of ventilation? a. sternocleidomastoid ✏ d. diaphragm c. external intercostals d. myocardium During the process of inspiration the; a. diaphragm contracts and moves downward. ✏ It becomes flattened allowing lung volume to increase. b. diaphragm contracts and moves upwards c. diaphragm relaxes and moves downward d. diaphragm relaxes and moves upwards During the process of inspiration the; a. external intercostal muscles relax and move the diaphragm upwards b. external intercostal muscles relax to allow the chest wall to move up and out c. the external intercostal muscles contract and move the chest wall down and in d. the external intercostal muscles contract and move the chest wall up and out ✏ Which statement about the ribs is true? a. men have 12 pairs of ribs and women have 11 pairs b. men have 11 pairs of ribs and women have 12 pairs c. ten pairs of ribs are connected to the sternum by costal cartilage ✏ True ribs are 8 pairs, and false ribs are 4 pairs, 9th and 10th are attached to the costal cartilage indirectly and the 11th and 12th are floating ribs that are not attached to the sternum at all. d. all of the ribs are directly attached to the sternum by the costal cartilage Which statements about inspiration is true? a. air is blown into the lungs using positive pressure ventilation b. air is sucked into the lungs using negative pressure ventilation ✏ c. the diaphragm moves upwards d. air enters the lungs as a result of the passive recoil of the elastic walls of the alveoli Identify one true statement: a. intrapulmonary pressure is lower than atmospheric pressure during expiration b. intrapulmonary pressure is higher than atmospheric pressure during inspiration c. intrapulmonary pressure is the same as the pressure in the alveoli. ✏ d. intrapulmonary pressure is higher than the pressure in the alveoli e. intrapulmonary pressure is lower than the pressure in the alveoli

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