-
Pulmonary ventilation
Air into and out of the lungs. it depends on the volume of the lungs and the pressure gradient.
-
external respiration
exchange of gas between the alveoli and blood.
-
internal respiration
exchange of gases between the blood and the tissues.
-
Boyles law
- if you need to change the pressure change the container.
- pressure= 1/volume if you change the volume then you change the pressure.
-
relaxed inspiration
also called eupnea iss caused by the contraction of the diaphram and the external intercostal.
-
relaxed expiration is caused by 3 factors
- 1) muscle tissue relaxation and recoil
- 2) lung tissue- the recoil of the connective tissue that surrounds the alveoli, its elastic in nature so it wants to recoil back into its regular shape
- 3) Lung tissue- surface tension, water is a polar molicule thats attracted to itself creating a pressure that wants to pull everything together, the lungs create a detergant that breaks up the polarity and allows you to breath in or else your lungs would just collapse (thats what happens to premes.
-
Forced breathing
- inspiration uses the muscles diaphram, external intercostal, scalane, pectoralis minor, sternocliedomastoid.
- Experation uses the muscles- abdomin (rectus abdominous, external and internal oblique, and internal intercostals.
-
intrapleural pressure
vital to keep the lungs at a low 756- 754 mmhg so that the lungs dont collapse (think the jagged knife and the piece of plastic to cover it up to keep the pressure normal)
-
Compliance
- how easy the lungs and thoracic wall can be expanded.
- high compliance- expands easily
- low compliance- doesnt expand easily
- you can reduce compliance by scar tissue, fluid in the lungs and reduced production of surfactant.
-
-
partial pressure
the amount of pressure created by each type of gas in a mixture. Think HENRYS LAW!!!
-
Henry's law
- when a gas under pressure comes in contact with a liquid a gas is dissolved in the liquid until equilibrium is reached.
- The amount of gas that dissolves into a solution is proportional to the partial pressure of that gas above the solution.
-
control of respiration
- medulla oblongata- inspiratory rhythmicy center, RR=12-15
- pons- 2 groups of nucli
-
factors that influence the RR
- central chemoreceptors checks the H+ ion sensor
- Brain stem monitors PCO2 levels indirectly by carbonic acid.
-
hemoglobin
heme-holds iron- holds 4 O2 and there are millions of hemoglobin molecules pure red blood cell.
-
CO2 is transported in 3 ways
- 23% carried by the protien in the blood (hemoglobin)
- 7% of CO2 is dissolved into the plasma of the blood
- 70% in the form of bicarbonate ions (HCO3-)
|
|