Biology – 8.2 Transport in humans | e-Consult
8.2 Transport in humans (1 questions)
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The four main components of blood are:
- Red blood cells (erythrocytes): Transport oxygen throughout the body. They contain haemoglobin, which binds to oxygen.
- White blood cells (leukocytes): Part of the immune system, defending the body against infection and disease. Different types of white blood cells have different roles.
- Platelets (thrombocytes): Involved in blood clotting. They help to stop bleeding by forming a plug at the site of injury.
- Plasma: The liquid component of blood. It is mostly water but also contains dissolved substances such as nutrients, hormones, antibodies, and waste products.