systems physiology ICA3 Flashcards
which one of the following statements about CO2 is correct?
The ability of haemoglobin to carry CO2 is greater within the capillaries of metabolically active tissues than in alveolar capillaries
Coronary blood flow is related to:
Force of left ventricle contraction
What causes hyper responsiveness in asthma?
Eosinophil cells destroying the epithelial lining
what parathyroid hormone does PTH/ the effects of parathyroid hormone?
Increases osteoclastic bone reabsorption
Which is incorrect about capillaries?
Capillary beds open at all times
Which valves closing cause the “lub dub” sound of the heartbeat?
“Lub” heard when closure of mitral and tricuspid valves at the start of systole. “Dub” heard when closure of aortic and pulmonary valves, marking the end of systole
What happens to interplurae pressure upon inspiration?
Becomes more negative
What is the Haldane effect?
the ability of deoxygenated blood to carry more carbon dioxide than oxygenated blood
what is the respiratory exhange ration (RER)?
The ratio between Carbon dioxide exhaled and oxygen inhaled in one breath
what does not affect ventilation/ diffusion rate?
haematocrit
Why does arterial PO2 differ from alveolar PO2?
Physiological shunt-blood from the bronchial circulation enters the pulmonary vein
what phases are not in a pacemaker tissue?
phases 1 and 2
what is the primary pacemaker in a healthy heart?
sinoatrial node (SAN)
what can cause ventricular filling to be impaired?
HR higher than 180bpm
what controls cardiac contraction?
SAN (pacemaker tissue)
