The heart and circulation Flashcards
what type of system do fish have?
what does this mean?
they have a single circulatory system
in fish, what type of blood is pumped from the heart to the gills?
deoxygenated blood is pumped from the heart to the gills
describe the single circulatory system in fish
heart->gills->organs->heart…
deoxygenated blood is pumped from the heart to the gills where it collects oxygen and becomes oxygenated
the oxygenated blood then passes straight from the gills to the organs where the oxygen diffuses out of the blood and into the body cells
the blood now returns to the heart
what happens in the gills of a fish?
deoxygenated blood (that’s pumped from the heart) gets carried to the gills where it collects oxygen and becomes oxygenated
where does the oxygenated blood from the gills then go to?
passes straight from the gills to the organs where the oxygen diffuses out of the blood and into the body cells
when oxygen is passed straight to the organs from the gills, what happens in the organs?
in the organs, oxygen diffuses out of the blood into the body cells
the blood then returns back to the heart
what are the problems with a single circulatory system?
The blood loses a lot of pressure as it passes through the gills before reaching the organs, this means that the blood travels to the organs relatively slowly meaning it CANNOT deliver a GREAT deal of oxygen
what type of system do humans have?
double cicrculatory system
fully describe the double circulatory system in humans.
heart->lungs->heart->organs->heart
deoxygenated blood is pumped from heart to lungs where it collects oxygen
the oxygenated blood then returns to the heart, the heart now pumps oxygenated blood to the organs where the blood transfers it’s oxygen to the body cells, the blood now returns back to the heart.
what is the benefit of a double circulatory system?
the blood passing through the heart twice means that it can travel rapidly to the body cells delivering the oxygen that the cells need.
where is deoxygenated blood pumped from?
where to?
the heart
the lungs
what happens in the lungs?
what happens after the lungs?
the deoxygenated blood collects oxygen in the lungs and becomes oxygenated
the oxygenated blood then returns back into the heart
after returning to the heart again, what then happens to the blood?
the heart pumps the now oxygenated blood to the organs
what happens in the organs of a human heart system?
blood transfers it’s oxygen to body cells, blood is then passed back to the heart
what is the heart?
what does it consist of?
what does it do?
it’s an organ consisting of mainly muscle tissues. The heart pumps blood around the body.