Overview Of The Respiratory System And Gas Laws Flashcards Preview

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Flashcards in Overview Of The Respiratory System And Gas Laws Deck (16):

What are some of the functions of the respiratory system?

Provides a supply of O2, disposal of CO"


How many generations are there of dividing airways?

23 generations of dividing airways, 1-16 are the conducting porions and therefore do not allow gas exchange, whereas 17-20 make up the respiratory zone and participate in gas exchange


What are the different stages of respiration?

The respiratory generator in the medulla, inspiratory muscles, expansion of airways, conducting airways, circulation


What happens in the process of expiration?

The neurones cease generating impulses and therefore the inspiratory muscles relax, and then the chest returns to size and this compresses the inflated lungs


What is boyles law?

The pressure is inversely proportional to the volume for a fixed quantity of gas at a constant temperature outside


What is the width of the alevolar capillary membrane?

0.3 um wide


What is the po2 in alevolar air?

13.3 kilopascals


What is the pO2 in venous blood?



What is the concept of partial pressures?

Provided the constieunts of a gas mixture do not chemically react each component of the gas exerts its own partial pressure in proportion to its volume percentage within the mixture


What happens when a gas mixture is in contact with water?

Gas molecules enter the liquid to dissolve, and then the water molecules evaportate to enter the gas phase


What is henrys law?

The amount of gas dissolved is proportional to the pressure of gas within the liquid


What is the soluability coeffiacant of a gas?

The amount in mmol of fas that will dissolve in 1l of plasma at 37 degrees c when exposed to a given partial pressure


How is alevolar air different from atmospheric air?

It has added water vapour, and O2 is constantly leaving and CO2 entering the alevolar air because of the gas exchange that is occruing


How is gas exhcange regulated?



How is the expansion of the chest muscles regulated?

Pulmonary reflexes,


What causes decompression sickness in divers?

Nitrogen moves from the high pressure in the lungs to the blood, a slow return to the surface lets the nitrogen return to the surface, whereas swimming up too quickly does not give the nitrogen enough time to leave the blood