circulatory systems

Created by

Charlotte Waters

Cards (14)

what are the 2 types of circulatory systems
open and closed
which organisms have single circulatory systems
fish
which organisms have double circulatory systems
mammals
what are single circulatory systems
blood only passes through the heart once for every complete circuit of the body
what are double circulatory systems
blood passes through the heart twice for every complete circuit of the body
how does the circulatory system work in fish
the heart pumps blood to the gills to become oxygenated and then on to the rest of the body then back to the heart
how does the circulatory system work in mammals
the right side of the heart pumps blood to the lungs to become oxygenated then from the lungs to the left side which pumps it to the rest of the body then back into the right side
what is an advantage of double circulatory systems
the heart can pump the blood at a higher pressure meaning a faster flow of blood
which organisms have closed circulatory systems
mammals and fish
which organisms have open circulatory systems
insects
what are closed circulatory systems
blood is enclosed inside blood vessels
what are open circulatory systems
blood isn't enclosed in blood vessels, instead it flows freely through the body cavity
how do closed circulatory systems work
the heart pumps blood in arteries which branch into many capillaries which substances diffuse out of into the body cells, but the blood stays inside the blood vessels as it circulates, blood returns to the heart by veins
how do open circulatory systems work
- The heart is segmented. it contracts in a wave, starting from the back, pumping the blood into a single main artery
- The artery opens up into the body cavity
- The blood flows around the insect's organs, gradually making its way back to the heart segments through a series of valves
- The open circulatory system only provides the insect with nutrients and hormones, not o2, this is provided by tracheae