It transports respiratory gases to and from the lungs, It carries metabolic products from the cells to the kidney, It is more viscous than water and its normal pH ranges between 7.35 – 7.45, Its major components are represented by plasma and figurative elements

Its white cells (leukocytes) contribute to the body’s protection against infections, It transports metabolic products and hormones, It transports nutrients from the digestive tract to the cells

Its two major components are: plasma and figurative elements, Its components are represented by plasm, blood cells (erythrocytes and leukocytes) and platelets, The greatest part of its figurative elements is represented by erythrocytes or red blood cells

Blood plasma which contains water and several dissolved substances, Red blood cells or erythrocytes, White cells (leukocytes) and platelets (fragments from the cytoplasm of megakaryocytes)

Oxygen transport from cells to the lungs, The transport of hormones from target cells to the originating endocrine gland, Serum coagulation due to the fibrinogen it contains

Figurative elements, up to 45%, Various ions (sodium, potassium, calcium, chloride, bicarbonate, Proteins that have a role in coagulation (fibrinogen)

Albumins and globulins (proteins), Lipids (cholesterol, triglycerides)

They contribute to blood viscosity, They are partly responsible for maintaining a certain blood pH, They transport certain substances (hormones, certain lipids)

Gammaglobulins are antibody molecules, Alpha and beta globulins are plasma proteins which transport hormones, vitamins, fatty acids, Gammaglobulins enter into specific combinations with the substances which stimulated their formation (antigens)

It contains lipids, glucose, amino acids and other metabolites (nitrogen-containing products), It contains 1% ions (Na+, K+, Ca2+ etc.), It contains dissolved gases (O2 – approximately 2% of the quantity transported by blood and CO2 – approximately 7% of the total CO2 transported by blood)

Neutrophils and basophils are leukocytes belonging to the class of granulocytes, Red blood cells are also called erythrocytes, Lymphocytes and monocytes are agranulocytes and belong to leukocytes

They are represented by red blood cells, leukocytes and thrombocytes, They male up 45% of the whole blood, Leukocytes include: monocytes, basophils, neutrophils, lymphocytes

Thrombocytes – blood platelets – fragments from the cytoplasm of megakaryocytes, Leukocytes – white cells – protection against infection, Basophils – white cells – possible role in the allergic response, Erythrocytes – red blood cells - O2 transport – CO2 transport

They contain haemoglobin, consisting of four polypeptide chains, each associated to a heme group, Circulate in the blood for about 120 days, being subsequently phagocytized and destroyed by macrophages, They are formed by erythropoiesis - a complex process which starts in the stem cell (hemocytoblast)

Contains 4 polypeptide chains: two called alpha and two called beta, Each haemoglobin molecule can transport four oxygen molecules (O2)

It binds rapidly to iron ions in the heme groups forming a strong bond, When binding to haemoglobin it takes up the space allotted to oxygen, with potentially lethal results

After the release of iron, the heme is initially transformed into biliverdin, By means of the bile, bilirubin is transported into the bowel and is subjected to the action of intestinal flora, Under the action of the intestinal bacterial flora, part of the bilirubin is converted into urobilinogen

Protein molecules, called antigens, Antigen A, antigen B, antigen Rh

Blood group A has antingen A on the erythrocyte and anti-B antibodies in the serum, Blood group B has antingen B on the erythrocyte and anti-A antibodies in the serum, Blood group AB has both A and B antigens on the erythrocyte and no antibodies in the serum, The type of antigen (antigens) on the surface of the erythrocytes is the one that determines the blood group

Anti-B antibodies in the serum and antigen A on the erythrocyte surface – blood group A, Anti-A antibodies in the serum and antigen B on the erythrocyte surface – blood group B

It has both types of antibodies, anti-A and anti-B, in the serum, Can donate blood to the blood group A, Can donate blood to the blood group B

It has A antigens on the erythrocyte surface, It has anti-B antibodies in the serum, Can donate blood to blood group AB

It has B antigen on the erythrocyte surface, Can donate blood to blood group B, Has anti-A antibodies in the serum

It has antigens A and B on the erythrocyte surface, It can receive blood from blood groups A and B, It can receive blood from blood group 0