Human transport system has two components, blood vascular system and lymphatic system.

Blood Vascular System: It consists of blood, blood vessels (tubes) and heart.

Heart: It is pumping organ of blood vascular system.

Blood is made of plasma and three types of cells - red blood corpuscles, white blood corpuscles and blood platelets.

1. Blood Plasma: Transport of nutrients, excretory materials, hormones etc.

• Antibodies in the form of immunoglobins.
• Prothrombin and fibrinogen for blood clotting.

2. Red Blood Corpuscles: Transport of oxygen as oxyhaemoglobin. Transport of about 23% carbon dioxide as carbaminohaemoglobin.

3. White Blood Corpuscles: Phagocytosis of germ cells, production of antibodies and histamine.

4. Blood Platelets: Formation of thromboplastin for blood clotting.

• Collection of extra tissue fluid and passing it back into blood.
• Picking up tissue secretions and passing into blood.
• Attracting and carrying germs to lymph nodes.

Blood Vessels:

1. Arteries: Taking away blood from heart to different body parts.
2. Veins: Transporting blood towards heart from various body parts.
3. Capillaries: Exchange of materials between blood and living cells through tissue fluid.

Lymphatic System: It consists of lymph, lymph vessels and lymph nodes.

Lymph:

1. Collection of extra tissue fluid and passing it back into blood.
2. Picking up tissue secretions and passing into blood.
3. Attracting and carrying germs to lymph nodes.

Lymph Vessel: Collection of lymph and passing the same into veins.

Lymph Nodes:

1. Lymph organs specialised to filter germs,
2. Maturation of lymphocytes.