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)
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1
Q

What are some of the functions of the respiratory system?

A

Provides a supply of O2, disposal of CO”

2
Q

How many generations are there of dividing airways?

A

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

3
Q

What are the different stages of respiration?

A

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

4
Q

What happens in the process of expiration?

A

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

5
Q

What is boyles law?

A

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

6
Q

What is the width of the alevolar capillary membrane?

A

0.3 um wide

7
Q

What is the po2 in alevolar air?

A

13.3 kilopascals

8
Q

What is the pO2 in venous blood?

A

6.0kPa

9
Q

What is the concept of partial pressures?

A

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

10
Q

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

A

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

11
Q

What is henrys law?

A

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

12
Q

What is the soluability coeffiacant of a gas?

A

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

13
Q

How is alevolar air different from atmospheric air?

A

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

14
Q

How is gas exhcange regulated?

A

Chemoreceptors

15
Q

How is the expansion of the chest muscles regulated?

A

Pulmonary reflexes,

16
Q

What causes decompression sickness in divers?

A

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