The circulatory system Flashcards
What do large animals need?
A circulatory system
Diffusion is only effiecnt over what distances?
Over short distances
So what does any animal bigger than a simple worm need?
A system that will bring glucose and oxygen into close contact with individual cells
In humans what does the heart do?
Pumps blood around the body through blood vessels
How many chambers does the heart have and what are they?
4 chambers - 2 atria and 2 ventricles
What do the blood vessels do?
Carry blood around the entire body and go to every organ before returning the blood to the heart
How many main types of blood vessel are there and name them?
3 - Arteries, veins, capillaries
What do arteries do?
Carry blood away from the heart
What do veins do?
Carry blood to the heart
What do capillaries do?
Where the exchange between blood and the cells takes place
What happens as blood flows through the tissues?
Dissolved substances such as glucose, oxygen and carbon dioxide are exchanged between the blood and around the cells
What is the main artery in the human body called and what does it do?
The aorta - it cartries oxygenated blood from the heart to the rest of the body
