Edexcel IGCSE Biology 复习笔记 2.8.5 Human Transport Systems: Blood

• Blood consists of red blood cells, white blood cells, platelets and plasma
• Over half of the volume of the blood is made up of plasma
• The majority of the other half is made up of red blood cells
• The remaining fraction consists of white blood cells and platelets

Blood micrograph

Composition of human blood

Components of the Blood Table