Certificate in Human Circulatory System

Explore how the circulatory system transports oxygen to cells, removes carbon dioxide, distributes nutrients, and facilitates waste removal via the kidneys to support metabolism.

Transport hormones from endocrine glands to target organs to regulate processes like insulin; support temperature regulation and clotting via platelets and fibrin, while white blood cells defend against pathogens.

Explore the blood and lymphatic circulatory systems, from the heart and vessels to blood components and lymphatic organs, and how they maintain fluid balance and transport oxygen and waste.

Explore color variation in blood by oxygen content—from bright scarlet to dark crimson—due to hemoglobin; note pH ~7.35–7.45, temperature ~38°C, and volumes (~5–6 L men, ~4–5 L women) supporting circulation.

Explore the hierarchy of blood components, including plasma as 55% of volume and the formed elements—erythrocytes, leukocytes, and thrombocytes—and their roles in transport, immunity, and clotting.

Explore how red blood cells transport oxygen and carbon dioxide via hemoglobin, forming oxyhemoglobin in the lungs. Carbaminohemoglobin forms in tissues to carry carbon dioxide.

Explore red blood cells and hemoglobin, their role in oxygen transport, how anemia and cyanosis arise, and how hematopoiesis and hematocrit measure blood health.

Understand the life cycle of red blood cells, including a 102–120 day lifespan and spleen-based phagocytic removal by histiocytes that recycle iron and convert heme to bilirubin.

Explore leukocytes, the white blood cells that defend against bacteria, viruses, fungi, and parasites, support immune surveillance, and remove debris through nucleus-containing immune functions.

Leukocytes use amoeboid movement and phagocytosis to defend against pathogens, migrate by diapedesis to infection sites, and support immune surveillance and tissue repair.

White blood cells, or leukocytes, are classified as granulocytes and agranulocytes. Granulocytes include neutrophils, eosinophils, and basophils; agranulocytes include lymphocytes and monocytes.

Compare macrophages' phagocytosis, antigen presentation, and cytokine signaling with lymphocytes' antibody mediated and cell mediated immunity, highlighting tissue resident and activated macrophages, B cells, and T cells.

Explore the normal range of white blood cells and the abnormalities leukocytosis, leukemia, and leukopenia, and learn how lymphoid organs guide white blood cell maturation.

Platelets, small fragments derived from megakaryocytes, initiate hemostasis by forming fibrin strands from fibrinogen; they adhere to injury sites, release chemicals, and trap cells to stop bleeding.

Trace the blood clotting process from vasoconstriction and platelet adhesion through the coagulation cascade to fibrin mesh formation, clot retraction, and fibrinolysis.

Compare red blood cells, white blood cells, and platelets by shape, abundance, formation, and function, and review related disorders such as anemia, leukopenia, and thrombocytopenia.

Explain the abo blood type system and the role of A and B antigens, and emphasize why knowing your blood type matters for transfusions, pregnancy, emergencies, and transplants.

Explore the ABO blood group system, identifying A, B, AB, and O antigens on red blood cells and the corresponding antibodies in plasma to understand transfusion compatibility.

Explain Abo and Rh compatibility, cross-matching, and the role of universal donor blood in transfusions. Emphasize the risks of transfusion reactions and hemolytic disease of the newborn.

Explore the Rh blood group system, detailing the D antigen on red blood cells, inheritance of Rh positive or negative status, and sensitization leading to hemolytic disease of the newborn.

Explore the hierarchical structure of the cardiovascular system, from the heart with four chambers to arteries, veins, and capillaries, and examine the conduction system along with systemic and pulmonary circulations.

Arteries carry oxygenated blood from the heart to tissues, featuring a three-layer wall (endothelium, smooth muscle, elastic fibers) and elastic and muscular types; arterioles regulate resistance and blood pressure.

Explore veins in the human circulatory system: three-layer walls with endothelium, valves that prevent backflow, and superficial, deep, and venous sinuses in venous return.

Explore how capillaries, the smallest vessels forming networks between arterioles and venules, enable gas and nutrient exchange, with continuous, fenestrated, and discontinuous types.

Discover the heart's four chambers, valves, and surrounding vessels, and how the septum and muscular walls guide blood from the atria through the ventricles to the lungs and the body.

Understand the heart's electrical conduction system—SA node, AV node, bundle of His, bundle branches, and Purkinje fibers—that coordinate atrial and ventricular contraction for efficient blood circulation.

Explore the cardiac cycle, detailing atrial and ventricular contraction and relaxation, diastole and systole, isovolumetric phases leading to ejection. Also learn how heart sounds and autonomic regulation shape heart rate.

Explore how heart rate, the number of beats per minute, reflects cardiovascular health and how age, activity, emotions, temperature, and medications influence resting rates.

Understand how blood pressure measures the force of blood against arterial walls. Show systolic over diastolic readings in millimeters of mercury and how age, weight, exercise, and stress affect them.