What do you know about? erythrocytes? leukocytes? Anemia? Blood in general? Types?

BLOOD: A LIQUID TISSUE Transportation: nutrients, wastes, heat Regulation: pH, temperature Protection: clot, disease, antibodies

Blood components 55% Plasma: 92% water;8% ions/proteins 45% Formed elements –Erythrocytes (red blood cells) – 99% –Leukocytes (white blood cells) – less 1% –Platelets – less 1%

HEMATOCRIT

Erythrocytes Transports oxygen (attached to hemoglobin) Contains iron Lack a nucleus Outnumber WBCs 700 to 1

hemoglobin Iron-containing protein (4) Transports oxygen (1 per iron)

Anemia… Decrease in the oxygen-carrying capacity of blood. Causes: –Excessive bleeding –Iron deficiency –Sickle-cell anemia

Leukocytes Important for defense (mobile army) Contain nuclei Can slip out of blood vessels

N ever (neutrophils) L et (lymphocytes) M onkeys (monocytes) E at (eosinophils) B ananas (basophils)

question An increase in the number of WBCs usually indicates……?

platelets Not true cells – but cell fragments Important for clotting

assignment List the types of white blood cells in decreasing order of abundance in the blood and for each type of white blood cell, describe that cell’s function, the cell type from which it differentiated from, and draw a picture of that cell (paying attention to the shape of the nucleus and size of cell) Helpful pages: