What is the primary function of red blood cells?

Which protein is converted to form a mesh during blood clotting?

Which substance is NOT transported in blood plasma?

What is the shape of a red blood cell?

Which type of white blood cell produces antibodies?

Describe the process of blood clotting. [4 marks]

Explain the difference between the functions of phagocytes and lymphocytes. [4 marks]

Describe THREE adaptations of red blood cells and explain how each helps their function. [6 marks]

Explain why platelets are described as cell fragments rather than complete cells. [2 marks]

State FOUR substances transported in blood plasma. [4 marks]

A student observes a blood smear under a microscope. Cell A has a large round nucleus that fills most of the cell. Cell B has an irregular, lobed nucleus. Identify Cell A and Cell B.

A student investigates blood clotting time. Suggest TWO safety precautions when handling blood samples.

A student counts the number of red blood cells in a sample using a haemocytometer. The student counts 200 cells in a 0.1mm³ volume. Calculate the number of red blood cells per mm³. Show your working.

Draw a biological diagram of a phagocyte. Your diagram must show the lobed nucleus. Include labels and a title.

A student investigates the effect of temperature on blood clotting time. State the independent variable, dependent variable, and TWO control variables.