Human Biology: Blood, Immunity, and the Circulatory System

How does the human body transport life-giving oxygen, defend against microscopic invaders, and maintain internal balance? Understanding the circulatory system and the blood that flows through it is essential to grasping human biology. This text-based course offers a clear, step-by-step guide to cardiovascular anatomy, blood composition, and the fundamentals of human immunity. You will progress from basic biological definitions to a functional understanding of how your heart, vessels, and immune cells work together to sustain life. What you'll learn: Understand the structure and primary functions of the heart and blood vessels; Identify the different components of blood, including red cells, white cells, platelets, and plasma; Explain how the lymphatic system supports circulation and immune defense; Analyze the body's lines of defense against pathogens and foreign invaders; Explore modern insights into cardiovascular health and preventative wellness; Practice explaining complex physiological processes through written review exercises. We begin with key terminology and foundational concepts before exploring blood composition and circulation pathways in detail. This course is designed for absolute beginners, students, or curious learners with no prior science background. Start reading today to build a strong foundation in human physiology.