Circulatory System - Blood Vessels Flashcards Preview

Combined Science AQA Biology B2 GCSE > Circulatory System - Blood Vessels > Flashcards

Flashcards in Circulatory System - Blood Vessels Deck (13):

What are the 3 types of blood vessels?

arteries, capillaries and veins.


What do the arteries do?

Carry blood under pressure as the walls are strong and elastic and they carry blood away from the heart.


What do arteries contain?

thick walls as they contain layers of muscle to make them strong and spring back they also have a whole down the middle called lumen


How are capillaries formed?

Arteries branch into capillaries


What do capillaries contain?

Thin walls only one cell thick to increase rate of diffusion by decreasing the distance over it occurs.


What do capillaries do?

carry blood really close to every cell in the body to exchange substances with them


What do capillaries supply?

they supply food and oxygen and take away waste materials eg. co2


What makes substances diffuse easily in and out of capillaries?

permable walls


What is the purpose of veins?

To take blood back to the heart, they have valves to keep the blood flowing in the correct direction.


How are veins formed?

Capillaries join up to form veins


Why don't the walls need to be as thick in the veins?

the blood is at a lower pressure


What helps the blood flow in veins?

the lumen is bigger


what is the calculation for blood flow?

rate of blood flow = volume of blood / number of minutes