Blood, tissue fluid & lymph

Blood is held in the heart & blood vessels.

Tissue fluid bathes the cells of the individual tissues.

Lymph is held within the lymphatic system.

Blood and tissue fluid

• Blood- consists of blood cells in plasma
• Plamsa contains many dissolved substances including oxygen, carbon dioxide, salts, glucose, fatty acids, amino acids, hormones & plasma proteins
• The cells include red blood cells, various white blood cells & fragments called platelets
• Tissue fluid- doesn't contain most the cells & plasma proteins

How tissue fluid is formed

• When an artery reaches the tissues- branches into smaller arterioles- then into a network of capillaries
• These eventually link up with venules…