BLOOD VESSELS

Question 1

WHAT ARE THE THREE TYPES OF BLOOD VESSELS

Answer 1

1) ARTERIES
2) CAPILARIES
3) VEINS

Question 2

ARTERIES (…)

Answer 2

CARRY BLOOD UNDER PRESSURE

Question 3

CHARACTERISTICS OF ARTERIES

Answer 3

1) HEART PUMPS THE BLOOD OUT AT HIGH PRESSURE SO THE ARTERY WALLS ARE STRONG AND ELASTIC
2) THE ELASTIC FIBRES ALLOW ARTERIES TO EXPAND
3) THEY WALLS CONTAIN THICK LAYERS OF MUSCLE TO MAKE THEM STRONG
4) THE HOLE IN THE MIDDLE IS CALLED THE LUMEN
5) THE LARGEST ARTERY IN THE BODY IS CALLED THE AORTA

Question 4

CAPILLARIES (…)

Answer 4

ARE REALLY SMALL

Question 5

CHARACTERISTICS OF CAPILLARIES

Answer 5

1) ARTERIES BRANCH INTO CAPILLARIES
2) CAPILLARIES ARE REALLY TINY
3) THEY CARRY BLOOD REALLY CLOSE TO EVERY CELL IN THE BODY TO EXCHANGE SUBSTANCES WITH THEM
4) THEY HAVE PERMEABLE WALLS FOR SUBSTANCES TO DIFFUSE IN AND OUT
5) THEY SUPPLY FOOD AND OXYGEN AND TAKE AWAY WASTES LIKE CO2
6) THEIR WALLS ARE USUALLY ONE CELL THICK WHICH INCREASES THE RATE OF DIFFUSION BY DECREASING THE DISTANCE OVER WHICH IT HAPPENS

Question 6

VEINS (…)

Answer 6

TAKE BLOOD BACK TO THE HEART

Question 7

CHARACTERISTICS OF VEINS

Answer 7

1) CAPILLARIES JOIN UP TO FORM VEINS
2) THE BLOOD IS AT A LOWER PRESSURE IN THE VEINS SO WALLS DONT NEED TO. BE THICK
3) THEY HAVE A BIG LUMEN TO HELP BLOOD FLOW DESPITE ITS LOW PRESSURE
4) THEY HAVE VALVES TO HELP KEEP THE BLOOD FLOWING IN THE RIGHT DIRECTION
5) THE LARGEST VEIN IN THE BODY IS THE VENA CAVA