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Biomedical Basics

Blood composition

  • Created by Henry Stewart Talks
Published on April 30, 2026   4 min

A selection of talks on Physiology & Anatomy

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This session centers on blood composition, offering a structured look at the structure and function of blood as a vital fluid tissue, focusing on its main components, plasma, red blood cells, white blood cells, and platelets. We will explore the roles plasma proteins play in maintaining internal stability, the oxygen carrying function of red blood cells, the immune response provided by white blood cells, and the clotting function of platelets. Finally, we will discuss how blood composition is regulated to keep the body's internal environment stable and highlight the significance of blood balance for overall health. Blood is a unique fluid tissue, vital for transporting life sustaining substances throughout the body. The process of oxygen traveling from the lungs to the toes, as well as how the body fights infection and stops bleeding is made possible by the components of blood. Blood consists of plasma and cellular elements, red blood cells, white blood cells, and platelets. Each plays a crucial role, making blood composition key to understanding human physiology. Let's begin by examining plasma, the pale yellow fluid that forms just over half of total blood volume. Plasma is about 90 to 92% water and contains dissolved substances, including plasma proteins like albumin, globulins, and fibrinogen. Albumin maintains osmotic pressure. Globulins include immune antibodies, and fibrinogen aids in clotting. Plasma carries electrolytes, nutrients, hormones,

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