Blood Vessels Yr 8

What is the name of blood vessels that take blood away from the heart?

• veins

• tubes

• capillaries

• arteries

Which of the following vessels has a wall that is only one cell thick?

• capillaries

• arteries and capillaries

• veins

• arteries

Blood returning to the heart from the body has a higher % of CO2 within it. Which state below explains this?

• the blood has produced more carbon dioxide as it flows around the body

• the blood has picked up the CO2 from the cells that have been performing respiration.

• the body has turned the blood cells into carbon dioxide

• the oxygen in the blood has turned into carbon dioxide

When blood returns from the lungs to the heart, it contains more O2 than it did when it left. Which statement explains why?

• the blood returning from the lungs has a low concentration of CO2

• the haemoglobin in the red blood cells binds to the oxygen

• the carbon dioxide is dissolved in the plasma

• the blood contains a higher concentration of O2 than the air when it arrives back at the lungs.

As red blood cells flow through the capillaries between muscle cells they.....

• pass out of the capillaries

• pick up oxygen

• will release carbon dioxide

• release oxygen by splitting up their oxy-haemoglobin molecules

The blood flows through the arteries

• slowly at high pressure

• quickly at low pressure

• slowly at low pressure

• quickly at high pressure

Blood flows through the veins....

• slowly at high pressure

• quickly at low pressure

• slowly at low pressure

• quickly at high pressure

In the organs, blood flows through....

• large, thick-walled blood vessels

• narrow, thick-walled blood vessels

• large, thin-walled blood vessels

• narrow, thin-walled blood vessels

What is the job of the valves that are found within both the heart and veins?

• to stop blood going in the wrong direction

• to speed up the flow of blood

• to check the contents of blood

• to stop the blood flowing

Which of the following statements describes the flow of blood through a vein?

• the veins contract and relax in a wave, forcing the blood in the right direction

• veins have valves which prevent blood flowing backwards. Skeletal muscles squeeze against the veins and push blood along

• veins have values which push the blood in the right direction and elastic walls which force the blood along

• as blood is pumped out of the heart the blood is sucked along the veins