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Uploaded byRangin A. Ghafwr
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Blood : The Body’s Living Transport System

This presentation provides a detailed overview of blood as a specialized connective tissue. It explores the intricate balance between plasma and formed elements, detailing the specific roles of Erythrocytes (oxygen transport), Leukocytes (immune defense), and Platelets (hemostasis).

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BIOLOGY & HEALTH SCIENCES Blood: The Body’s Living Transport System What blood is ?, what it contains ?, and why it matters ? Prepared by : Rangin A. Ghafwr
Outline A guided tour of blood—from composition to clinical meaning. 01 Blood : structure and composition 02 Plasma and formed elements 03 Red cells, white cells, and platelets 04 Hematopoiesis: making blood cells 05 Blood, homeostasis, and protection 06 Blood as a diagnostic window 1
One tissue, four major components Blood is specialized connective tissue: a fluid matrix plus formed elements ~55% plasma ~45% formed elements Plasma The liquid matrix that carries water, proteins, electrolytes, nutrients, hormones, gases, and wastes. TRANSPORT + REGULATION Red cells Hemoglobin-rich cells that move oxygen from lungs to tissues and help return carbon dioxide. GAS TRANSPORT White cells Immune cells that recognize threats, coordinate defenses, and respond to infection or injury. IMMUNE DEFENSE Platelets Small cell fragments that gather at damaged vessels and initiate primary hemostasis. HEMOSTASIS Sources: Mathew et al., NCBI Bookshelf · Bain, Medicine (2021) 2
Plasma is the body’s transport medium The liquid matrix in which blood cells travel—and the medium that keeps their environment stable. WHAT PLASMA CONTAINS ? Water, proteins, electrolytes, nutrients, hormones, dissolved gases, and metabolic wastes. WHAT PLASMA DOES ? Moves materials between organs; helps regulate fluid balance, pH, osmotic pressure, clotting, and heat distribution. 90% WATER PROTEINS ELECTROLYTES HORMONES NUTRIENTS + WASTES CLOTTING FACTORS Source: Mathew et al., Physiology, Blood Plasma — NCBI Bookshelf 3
Red cells make oxygen delivery possible Hemoglobin makes each red blood cell a mobile carrier for respiratory gases. Lungs Oxygen enters the bloodstream O2 PICK-UP Red blood cell Hemoglobin binds and transport O2 O2 DELIVERY Body tissues Cells use oxygen to support metabolism CO2 RETURNS TOWARD THE LUNGS Red-cell number, shape, and flexibility influence both oxygen delivery and the mechanics of blood flow. Sources: Bain, Medicine (2021) · Gillespie & Doctor, Frontiers in Pediatrics (2021) 4
White cells defend and coordinate immunity White blood cells circulate, enter tissues, and coordinate responses to infection, foreign material, and cellular stress. Rapid response Neutrophils and monocytes are major phagocytic cells that help contain threats early. Precise defense B cells, T cells, and natural killer cells support antibody- mediated and cellular responses. Continuous surveillance Movement between blood and tissues lets immune cells monitor the body as conditions change. Blood-smear micrograph: a lymphocyte is visible among red blood cells. Blood keeps immune cells mobile, ready to detect and respond. Image: CDC Public Health Image Library, ID 12085 Sources: Bain, Medicine (2021) · Dean, NCBI Bookshelf 5
Platelets stop bleeding fast Small cell fragments act within seconds when a blood vessel is damaged. PRIMARY HEMOSTASIS 01 Vessel injury The vessel lining is disrupted 02 Platelet adhesion Platelets adhere and become activated at the injury site. 03 Platelet plug formation Activated platelets aggregate to form a temporary plug. Beyond clotting: platelets also communicate with immune cells and influence inflammation and host defense. SEM visual: red cells entangled in a fibrin matrix on a catheter surface. Fibrin creates a physical framework that helps stabilize the clot. Image: CDC PHIL ID 7320 — CDC / Janice Haney Carr, public domain Sources: Semple et al., Nature Reviews Immunology (2011) · Bain, Medicine (2021) 6
Hematopoiesis: How blood cells are made ? In adults, self-renewing hematopoietic stem cells in bone marrow continually replenish the blood system. Hematopoietic stem cell self-renewal + multipotency Myeloid lineage Red blood cells · megakaryocytes → platelets · neutrophils and monocytes Lymphoid lineage B cells · T cells · natural killer cells and other lymphocyte populations A stem-cell hierarchy replaces mature blood cells throughout life. Source: Orkin & Zon, Cell (2008) 7
Blood maintains internal stability A single circulating system integrates transport, protection, regulation, and repair. BLOOD Transport Gases, nutrients, hormones, wastes Protection Immune defense and clotting Regulation pH, fluid balance, heat, osmolality Repair Hemostasis after injury Sources: Mathew et al., NCBI Bookshelf · Dean, NCBI Bookshelf 8
Blood is a diagnostic window A complete blood count (CBC) measures the quantity and features of circulating blood cells. COMPLETE BLOOD COUNT (CBC): A STRUCTURED VIEW OF CIRCULATING CELLS Red-cell measures RBC · hemoglobin · hematocrit · indices Helps assess oxygen-carrying capacity and red-cell size patterns. White-cell measures WBC count + differential Provides information about immune-cell populations and activity. Platelet measure Platelet count Shows the abundance of cells central to primary hemostasis. Important: CBC patterns guide clinical questions; they are interpreted with symptoms, history, and other tests. Source: El Brihi & Pathak, NCBI Bookshelf (2024) 9
Why blood matters in real life Blood keeps each tissue supplied, monitored, and connected to the rest of the body. Oxygen delivery Red cells deliver oxygen to tissues, supporting cellular metabolism throughout the body. Diagnostic insight Blood tests can reveal changes in oxygen-carrying capacity, immunity, hydration, and coagulation. Component support Transfusion medicine can replace or support specific components when injury or disease disrupts the system. Blood is not just red fluid—it is a dynamic tissue that keeps the body connected. Sources: Mathew et al., NCBI Bookshelf · Bain, Medicine (2021) 10
References 1. Mathew J, et al. Physiology, Blood Plasma. StatPearls. NCBI Bookshelf. 2. Dean L. Blood and the cells it contains. In: Blood Groups and Red Cell Antigens. NCBI Bookshelf. 3. Bain BJ. Structure and function of red and white blood cells and platelets. Medicine. 2021;49(4):183–188. 4. Gillespie AH, Doctor A. Red Blood Cell Contribution to Hemostasis. Frontiers in Pediatrics. 2021;9:629824. 5. Semple JW, Italiano JE Jr, Freedman J. Platelets and the immune continuum. Nature Reviews Immunology. 2011;11:264–274. 6. Weisel JW, Litvinov RI. Red blood cells: the forgotten player in hemostasis and thrombosis. Journal of Thrombosis and Haemostasis. 2019;17(2):271–282. 7. Orkin SH, Zon LI. Hematopoiesis: An Evolving Paradigm for Stem Cell Biology. Cell. 2008;132(4):631–644. 8. El Brihi J, Pathak S. Normal and Abnormal Complete Blood Count With Differential . StatPearls. NCBI Bookshelf. 11