Topics: Blood, Physiology, red blood cell morphology, red blood cell, Erythropoiesis, Poikilocytosis, Anisocytosis, Roleaux, Pluripotential haemopoietic stem cells, Colony Forming Unit erythrocyte, Erythropoietin, folic acid, iron, Pluripotential haemopoietic stem cells, Blood transfusion, anaemia, platelets, thrombocytes, white blood cell, Neutrophils, Cortisol hormone, eosinophils, Basophils, Lymphocytes, Monocyte, reticulocyte, myelopoiesis, Chemotaxis, Opsonization, Diapedesis, Phagocytosis, Leukaemia, Leukopenia, blood group, Rhesus factor, Agglutinin, blood fluid compartments, Agglutinin, intracellular fluid, Hyponatraemia, Hypernatraemia, Hypokalaemia, biological rhythm, Transmembrane protein, membrane transport, passive transport, active transport, haemoglobin level, haemoglobin disease, anemia, biological potentials, resting membrane potential, action potential, cell, osmolality, nerve impulse conduction, synaptic transmission, neuromuscular transmission, neurotransmitters