This section introduces the fundamental concepts of cell biology, distinguishing between prokaryotic and eukaryotic cells, their varying sizes, and the types of organisms that fall into each category, such as bacteria and archaea for prokaryotes, and animals, plants, protists, and fungi for eukaryotes. It also outlines the subcellular structures and their functions in animal, plant, and bacterial cells.

This segment explains cell differentiation, the process by which cells become specialized for particular jobs. It discusses when differentiation occurs in different organisms (early in animals, throughout life in plants) and provides examples of specialized cells in animals (sperm, nerve, muscle cells) and plants (root hair, phloem, xylem). It also touches upon the role of stem cells as undifferentiated cells.

This part details the components of a light microscope and its limitations compared to more powerful electron microscopes. It defines magnification and resolution and explains how to calculate magnification using image size and actual sample size. The use of standard form for expressing very large or small numbers in science is also covered.

This section focuses on binary fission, the process of bacterial division, and how to calculate bacterial population growth using mean division time. It also describes laboratory methods for culturing microorganisms, including the use of culture media, Petri dishes, and aseptic techniques. The application of bacterial culturing in testing antibiotic effectiveness is also explained.

This segment explains chromosomes as carriers of genetic information (DNA) and their role in the cell cycle. It describes the stages of the cell cycle, including cell growth and DNA replication, and then details the process of mitosis, where one parent cell divides into two genetically identical daughter cells, emphasizing its importance for growth, replacement, and repair.

This part defines stem cells as undifferentiated cells capable of self-renewal and differentiation into specialized cells. It distinguishes between embryonic and adult stem cells, their locations, and their potential medical applications, including therapeutic cloning. The ethical considerations surrounding stem cell research, particularly embryonic stem cells, are also discussed, along with plant stem cells (meristems) and their agricultural uses.

This section clarifies diffusion as the net movement of particles from high to low concentration and the factors affecting its rate (concentration gradient, temperature, surface area). It explains why multicellular organisms need specialized exchange surfaces due to a lower surface area to volume ratio, and describes adaptations of these surfaces for efficient diffusion in animals (lungs, small intestine) and plants (leaves).

This segment defines osmosis as the movement of water molecules across a partially permeable membrane from high to low water concentration. It differentiates osmosis from general diffusion and introduces active transport, the energy-requiring movement of substances against a concentration gradient. Examples of active transport in plant root hair cells and human digestive systems are provided.

This part explains the hierarchical organization of living organisms, starting from specialized cells forming tissues (muscular, glandular, epithelial), which then combine to form organs (e.g., stomach). Finally, organs work together in organ systems (e.g., digestive system) to perform specific functions necessary for the survival of the entire organism.

This section introduces enzymes as biological catalysts that speed up chemical reactions. It describes their protein structure, active site, and the lock-and-key model, explaining their specificity. The impact of temperature and pH on enzyme activity and denaturation is covered. The role of digestive enzymes (carbohydrases, proteases, lipases) and bile in breaking down food into absorbable nutrients is detailed.

This segment describes the structure and function of the lungs in gas exchange, detailing the path of air through the respiratory system to the alveoli. It then explains the human double circulatory system, the structure of the four-chambered heart as a pump, and the flow of blood through pulmonary and systemic circulation to deliver oxygen and nutrients and remove waste.

This part examines the three types of blood vessels: arteries, capillaries, and veins, highlighting their specialized structures and functions. It then describes the four main components of blood (red blood cells, white blood cells, platelets, and plasma) and their specific roles in oxygen transport, immune defense, blood clotting, and substance transportation.

This segment defines coronary heart disease as the narrowing of coronary arteries due to fatty deposits. It discusses various treatments such as stents to keep arteries open, statins to reduce cholesterol, mechanical devices and heart transplants for severe heart failure, and valve replacements for damaged heart valves. The use of blood substitutes in cases of major blood loss is also mentioned.

This section defines health beyond the absence of illness and differentiates between communicable (infectious) and non-communicable diseases. It explains how different diseases can interact and worsen health outcomes and highlights how lifestyle choices and environmental factors impact overall health. The influence of risk factors at global, national, and local levels is also discussed.

This part explains cancer as uncontrolled cell growth leading to tumors. It distinguishes between benign (non-spreading) and malignant (spreading) tumors and discusses various risk factors for cancer development, including lifestyle choices (smoking, obesity, UV exposure) and viral infections. The role of genetics and inherited faulty genes in cancer susceptibility is also covered.

This segment introduces various plant tissues: epidermal, palisade mesophyll, spongy mesophyll, xylem, phloem, and meristem tissue, detailing their functions. It explains how these tissues form organs like leaves, roots, and stems. The detailed structure of a leaf, including stomata and guard cells, is explored in relation to photosynthesis and gas exchange.

This part elaborate on xylem and phloem transport systems in plants. It explains how transpiration drives water movement through xylem vessels and the factors affecting transpiration rates: light, temperature, air flow, and humidity. Methods for measuring transpiration, such as using potometers, are described. The regulation of gas exchange and water loss by guard cells is also covered.

This section categorizes disease-causing microorganisms (pathogens) into bacteria, viruses, protists, and fungi, describing how each causes illness. It explains various transmission methods, including waterborne, airborne, and direct contact transmission. The impact of these infections on both plant and animal kingdoms is highlighted.

This segment delves into specific examples of diseases, including viral diseases (measles, HIV, tobacco mosaic virus), bacterial infections (salmonella, gonorrhea), a fungal disease (rose black spot), and a disease caused by a protist (malaria). For each disease, it covers symptoms, transmission, effects on humans or plants, and prevention/treatment strategies.

This part outlines the body's non-specific defense mechanisms against pathogens, beginning with physical barriers like skin, mucus, cilia, and stomach acid. It then explains how the immune system responds when pathogens breach these barriers, focusing on the roles of white blood cells through phagocytosis, antibody production, and antitoxin production to achieve immunity.

This section explains how vaccination works by exposing the immune system to dead or inactive pathogens to stimulate antibody production, leading to future rapid response. It introduces the concept of herd immunity, where widespread vaccination protects unvaccinated individuals by reducing pathogen spread. The success, benefits, and limitations of vaccination programs are also discussed.

This segment distinguishes between painkillers, which manage disease symptoms without curing the underlying cause, and antibiotics, which actively fight bacterial infections by killing or preventing reproduction of bacteria. It emphasizes that antibiotics are ineffective against viruses due to their different structure and life cycle, highlighting the critical role of antibiotics in medicine and the importance of their correct use.

This part explores the historical origins of medicines from natural sources like plants (aspirin from willow bark, digitalis from foxglove) and microorganisms (penicillin). It then details the rigorous process of modern drug development, from initial laboratory and animal testing (preclinical evaluation) to human clinical trials (phases focusing on safety, dosage, and efficacy) and the importance of blinding and peer review for scientific validity.

This segment defines monoclonal antibodies as identical artificial antibodies that target a specific antigen. It explains the production process involving fusing mouse lymphocytes with tumor cells to create hybridoma cells that produce specific antibodies and multiply indefinitely. Various applications are discussed, including diagnostic uses (pregnancy tests), research tools, and therapeutic uses for cancer treatment, where they can target specific cancer cells with minimal harm to healthy tissue.

This section discusses how to recognize signs of disease in plants, such as stunted growth, spots, decay, malformations, and discoloration. It covers methods for identifying plant diseases, including consulting manuals, laboratory testing, and using monoclonal antibody kits. It then details the physical (waxy cuticle, cell walls, bark), chemical (antibacterial chemicals, poisons), and mechanical (thorns, hairs, mimicry) defense mechanisms plants use against pathogens and pests.

This part explains photosynthesis as an endothermic process where plants convert carbon dioxide and water into glucose and oxygen using light energy, occurring in chloroplasts. It presents the word and chemical equations. Key environmental limiting factors—light intensity, carbon dioxide concentration, and temperature—are detailed, along with how plants utilize the produced glucose for energy, storage, structural components, protein synthesis, and fats/oils. Practical applications in agriculture are also mentioned.

This segment clarifies respiration as the energy transfer from glucose breakdown, distinguishing it from breathing. It explains two types: aerobic respiration (with oxygen, efficient, producing carbon dioxide and water) and anaerobic respiration (without oxygen, less efficient, producing lactic acid in animals, ethanol and carbon dioxide in plants/yeast). It discusses the body's response to exercise, including increased breathing/heart rate, and the concept of oxygen debt после intense anaerobic activity.

This final part defines metabolism as all chemical reactions in an organism, controlled by enzymes. It describes two main types of metabolic reactions: synthesis (building complex molecules from smaller ones, e.g., carbohydrates, lipids, proteins) and breakdown (releasing energy, e.g., respiration of glucose, breakdown of excess proteins into urea). The balance between these processes is highlighted as essential for life.