Blood

Erythrocytes? Leukocytes? Anemia? Hemoglobine? What Do You Know About? Erythrocytes? Leukocytes? Anemia? Hemoglobine? Blood in General? Types?

Components of the Blood 55% Plasma: 92% water; 8% ions/proteins 45% Formed Elements Erythrocytes (red blood cells) = 99% Leukocytes (white blood cells) = less than 1% Platelets = less than 1%

Erythrocytes Transports oxygen Lack of a nucleus Sacs of hemoglobin 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

Polycythemia Excessive or abnormal increase in RBCs Causes: May result in bone marrow cancer Living in high altitudes Causes blood flow to be “sluggish”

Leukocytes Important for defense (mobile army) Contains nuclei Can Slip out of blood vessels (chemotaxis), move by amoeboid motion

Types/Functions (from most to least abundant) Neutrophils: 1st responders, phagocytes Lymphocytes: B cells, T cells, natural killer cells Monocytes: phagocytosis Eosinophils: fights parasites Basophils: releases histamine (a vasodilator)

HELP! Never Let Monkey Eat Bananas

Question! An increase in the number of WBCs usually indicates……?

Platelets Not true cells – but cell fragments Important for clotting