Cardiovascular system Flashcards
Gaseous exchange (external) at rest
Oxygen + CO2
At the alveoli:
PPO2 is high
PPCO2 is low
In the blood:
PPO2 is low
PPCO2 is high
Gases travel from high PP to low PP
Gaseous exchange (external) with exercise
In the alveoli:
PPO2= high
PPCO2= low
In the blood:
PPO2= highER
PPCO2= lowER
Control (VCC)
Vascular shunt
Chemoreceptors
increase acidity
Proprioceptors
increase movement of the blood
Baroreceptors
increase blood pressure
CCC
Heart Rate
RCC
Breathing
Cardiac cycle
A systole, AV node, BoH, purkinje fibres
What happens to SV as exercise intensity increases?
increases until sub-max then gradually decreases
What affects SV
venous return- sterlings law (as much blood returns) ventricular stretch (more blood=ore contraction) aortic and pulmonary artery pressure
explain the journey with vascular shunt
arterioles - capillary beds - vasoconstrict/ dilate
Inspiration at rest
external intercostal muscles pull ribcage up and out - diaphragm contracts - volume of thoracic cavity decreases, pressure increases - gases move high to low and air moves in
Expiration at rest
opposite of inspiration
Inspiration during exercise
same as rest but greater- sternocleidomastoid moves ribs forcefully
Expiration during exercise
same as rest but more forcefully- internal intercostal creates more force with ribs
what is the dissociation of O2 from Hb affected by
increase in temp
decrease in po2 in muscle
increase in pco2 in muscle
bohr effect
what happens to hb dissociation during exercise
more o2 unloading from the blood in muscle cell
What is pulmonary ventilation?
breathing in and out
