Circulatory System Flashcards
What colour are veins represent as
Blue
What colour are arteries represented as
Red
What are the main two arteries in the heart
1) pulmonary artery
2) aorta
What are the main two veins in the heart
1) pulmonary vein
2) vena cava
What does the pulmonary artery do
It brings deoxygenated blood from the heart to the lungs
What does the aorta do
It brings oxygenated blood from the heart to the rest of the body
What does the pulmonary vein do
It brings the oxygenated blood from the lungs to the heart
What does the vena cava do
It bring deoxygenated blood from the body to the heart
What are the properties of arteries
1) thick outer wall
2) small lumen
3) thick layer of muscle and elastic fibres
4) smooth inner lining
Why do arteries have thick outer walls and thick layers of muscles
to withstand high pressure of blood flowing from heart
Properties of veins
1) fairly thin outer walls
2) thin layer of muscle and elastic fibres
3) large lumen
4) smooth lining
Properties of capillaries
1) wall made of single layer cells
2)very small lumen
3) large overall cross sectional area (there are many of them around the body
Why is the outer wall of capillaries only one cell thick
To allow substances to diffuse in and out through them to link the arteries and veins
Why do the pulmonary artery and aorta cross over?
Because we have two lungs and we have a double circulatory system
What does it mean to have a double circulatory system
It means that the blood travels through the heart twice to complete its journey once, and has two different circuits for oxygenated and deoxygenated blood
