The composition of blood

What are my objectives while studying this topic?

The heart is the central organ within the circulatory system. You will study the structure of the heart and the specialized cells that make up the tissues forming the heart. This will help you understand the function of the heart within the cardiac cycle. You will also study the composition of the blood and how its content is maintained in the circulatory system.

Fibrin and Sickle Cells

Why is this important?

Fitness and healthcare professionals measure and monitor heart function and the control of the blood flowing to and from the rest of the body by taking physiological measurements. These measurements assist professionals improve the well being and performance of an individual’s circulatory system as well as diagnosing cardiovascular diseases.

Can I get an introduction to this topic?

Yes, why not have a look at the following link:

Useful questions to ask:

1. What are the key components of the blood?

2. How does the structure of the red blood cells contribute to the effective delivery of oxygen throughout the body?

3. What is the function of the blood in maintaining our health when fighting disease?
What will I be expected to be able to do after studying this topic?

You’ll be expected to:

  • State the main components of blood

  • Describe the functions of blood

  • Describe the process of blood clotting


Take a look at the following link to help you understand blood clotting:

What are the key words to learn and use for this topic?

  • Erythrocytes (red blood cells)

  • Leucocytes (white blood cells)

  • Thrombocytes (blood platelets)

  • Plasma

How long will this topic take to study?

On average you’ll be looking at about three hours of taught time and independent study.

What are the main activities on this topic?


Practical microscopy for recognition of pre-prepared sample slides showing different components of the blood - erythrocytes (red blood cells), leucocytes (white blood cells), thrombocytes (blood platelets) and plasma.


Use a haemocytometer with a yeast culture to demonstrate the calculation of density of cells in a given volume. Make sure you link to the proportions of different cells in blood samples.


Discuss of the function of each of the components:
Erythrocytes carry oxygen - the function of haemoglobin,
Leucocytes are a major part of the immune system,
Thrombocytes facilitate blood clotting

Include the influence of calcium ions in clotting and the normal values as given in the specification p15 Table 1 ‘Normal values for some physiological measurements’,

Plasma has various functions to do with maintenance and control.


Take a look at the following link to help you with this:


Discuss the ethical treatment of patients with genetic disorders.

Revision Notes:

Take a look at the following link; you can get some good notes for revision of theory.

Back to Top