1 markFig. 1 shows a section through a blood vessel.
Fig. 1
Identify the type of blood vessel shown in Fig. 1.
3 marksRed blood cells are different to white blood cells.
State three ways in which a red blood cell is different to a white blood cell.
4 marksBlood has many components.
State the name of the liquid component of blood.
[1]
State three substances that are transported in the liquid component of blood.
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3 marksBlood circulates around the body in arteries, veins and capillaries.
Place ticks (✓) in the correct boxes in Table 1 to show the features of arteries.
Table 1
| structure and function | arteries |
| carries blood at high pressure | |
| carries blood towards the heart | |
| has a thick wall | |
| has a narrow lumen | |
| has valves present throughout the vessel |
3 marksFig. 1 shows a photomicrograph of a capillary with red blood cells passing through it.
Fig. 1
[1]
Red blood cells are one component of blood.
State the names of two other components of blood.
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2 marksThe blood has many components.
Fig. 1 shows a micrograph of a blood smear.
Fig. 1
On the diagram, identify a red blood cell and a white blood cell.
4 marksPlatelets are a component of blood that have an important role in blood clotting.
Describe the process of blood clotting by platelets.
3 marksBlood clots can sometimes form in veins around the body. This is called a venous thromboembolism (VTE) and can be associated with postoperative complications following surgery.
Calculate the percentage decrease in VTE death rates between 2001 and 2017.
4 marksVeins are a type of blood vessel found in mammals.
Compare the structure and function of veins with that of arteries.
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6 marksFig. 1 shows a photomicrograph of human blood.
Fig. 1
Describe the differences in appearance and the functions of the three cells labelled in Fig. 1.
3 marks
Fig. 2
Complete Fig. 2 by filling in the two empty boxes.
[1]
State two roles of blood clotting.
[2]
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3 marksFig. 1 shows a photomicrograph of some red blood cells.
Fig. 1
[1]
1 markState the name of a component of blood that is responsible for clotting.
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