the heart Flashcards
(11 cards)
left and right side ,
The right side of the heart receives deoxygenated blood from the body and pumps it to the lungs
The left side of the heart receives oxygenated blood from the lungs and pumps it to the body,
functions of valves
all valves is to prevent blood flowing backwards,
4 chambers 2 up, 2 down
2 up - ATRIA, an atrium, 2 bottom - Ventricles
artery
carries blood away from the heart
vein
carries blood to the heart
coronary arteries
make sure that the muscle tissue gets all the oxygen and nutrients that it needs
Relative muscle thickness in the Heart:
Ventricles have a thicker muscular wall than the atria because blood is pumped at a higher pressure; they also pump blood throughout the body, so they need strength
Monitoring heart activity
monitored by ECG, pulse rate and listening to sounds of valves closing.
the upper and lower valves
the upper are semilunar and the lower right one is tricuspid valve, left lower mitral valve
Why does Heart rate increase with exercise?
Heart beats stronger and faster In order to pump more oxygen rich blood to the tissues
More Oxygen is delivered to these tissues for increased respiration
Increased respiration creates more energy
This increased energy is required by the muscle which is being used more (during exercise), Following exercise, the heart continues to beat faster for a while to ensure that all excess waste products are removed from muscle cells, It is also likely that muscle cells have been respiring anaerobically during exercise and so have built up an oxygen debt, This needs to be ‘repaid’ following exercise and so the heart continues to beat faster to ensure that extra oxygen is still being delivered to muscle cells
The extra oxygen is used to break down the lactic acid that has been built up in cells as a result of anaerobic respiration
the features of arteries.
carries blood at high pressure, has a narrow lumen, has a thick wall
