phyiology Flashcards
phase Inflow of cardiac cycle valves
AV - open
SL - closed
Describe inflow
Diastole - blood passively flows from the atria to the ventricles.
Atrial systole - atria contract to force remaining blood into ventricles
Phase Isovolumetric Contraction valves
AV - closed
SL - closed
Describe Isovolumetric Contraction
Ventricles contract simultaneously, causing ventricular pressure to increase.
What occurs during Isovolumetric Contraction?
Production of S1 sound (atrioventricular valves close)
Phase Outflow valves
AV - closed
SL - open
Describe outflow
When ventricular pressure exceeds aortic/pulmonary artery pressure, blood is ejected from the ventricles into great vessels
Phase Isovolumetric Relaxation valves
AV - closed
SL - closed
Describe Isovolumetric Relaxation
Ventricles relax and the pressure in the aorta/pulmonary artery exceeds ventricular pressure again.
What occurs during Isovolumetric Relaxation?
Production of S2 sound (semilunar valves close)
Factors which Increased HCl production include what?
- Vagal stimulation
- Gastrin
- Histmine
How does small intestinal absorption occur?
via passive transport
FACTORS INCREASING BILE SECRETION
CCK
Gastrin
Secretin
Parasympathetic nervous system activation
FACTORS DECREASING BILE SECRETION
Sympathetic nervous system activation
Tidal volume means ?
the volume of air inhaled and exhaled during a normal quiet breath