Blood

Transport • Transports nutrients, oxygen and hormones to the tissues • Removes waste such as carbon dioxide and urea Regulation • Helps to keep the body’s pH within its homeostatic range • Helps in regulating the bodies temperature Protection • Prevents blood loss if blood vessels are damaged • Prevents the body from toxins and pathogens

Temprature = 38 C pH = 7.35/7.45 Salinity = 0.9% Total body weight = 8% Volume: - Men 5-6L - Women 4-5L

• A clear, pale, yellow liquid that comprises 46-63% of the whole blood • Plasma is 92% water • it is dissolved organic and inorganic solutes (wastes) • Also consists of plasma proteins (7%) Forms Fe (iron)

• Also known as red blood cells • Transport respiratory gas • Biconcave disks for larger surface area • short life span (!20 days) • Contains hemoglobin that combines 02 • Removed by spleen and liver • Made in bone marrow

• Also known as white blood cells • Protect the body against invasive organisms and tumour cells • Different types attack different cells/organisms • Move via amoebid motion

• Also known as platelets - used in clotting