Companion PDF worksheet for Edexcel IGCSE Biology Lecture 29 - Coordination. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.80 - Understand how organisms are able to respond to changes in their environment. Specification Point 2.81 - Understand that homeostasis is the maintenance of a constant internal environment, and that body water content and body temperature are both examples of homeostasis. Specification Point 2.82 - Understand that a coordinated response requires a stimulus, a receptor and an effector. Complete set of Chapter 4 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 28 - The Kidneys. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.72B - Understand how the kidney carries out its roles of excretion and osmoregulation. Specification Point 2.73B - Describe the structure of the urinary system, including the kidneys, ureters, bladder and urethra. Specification Point 2.74B - Describe the structure of a nephron, including the Bowman’s capsule and glomerulus, convoluted tubules, loop of Henle and collecting duct. Specification Point 2.75B - Describe ultrafiltration in the Bowman’s capsule and the composition of the glomerular filtrate. Specification Point 2.77B - Understand why selective reabsorption of glucose occurs at the proximal convoluted tubule. Specification Point 2.76B - Understand how water is reabsorbed into the blood from the collecting duct. Specification Point 2.78B - Describe the role of ADH in regulating the water content of the blood. Specification Point 2.79B - Understand that urine contains water, urea and ions. Complete set of Chapter 4 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 27 - Excretion. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.70 - Understand the origin of carbon dioxide and oxygen as waste products of metabolism and their loss from the stomata of a leaf. Specification Point 2.71 - Know the excretory products of the lungs, kidneys and skin. Complete set of Chapter 4 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.68 - Understand how the structure of arteries, veins and capillaries relate to their function. Specification Point 2.69 - Understand the general structure of the circulation system, including the blood vessels to and from the heart and lungs, liver and kidneys. Complete set of Chapter 3 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.65 - Describe the structure of the heart and how it functions. Specification Point 2.66 - Explain how the heart rate changes during exercise and under the influence of adrenaline. Specification Point 2.67 - Understand how factors may increase the risk of developing coronary heart disease. Complete set of Chapter 3 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.63B - Understand how vaccination results in the manufacture of memory cells, which enable future antibody production to the pathogen to occur sooner, faster and in greater quantity. Complete set of Chapter 3 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.59 - Describe the composition of the blood: red blood cells, white blood cells, platelets and plasma. Specification Point 2.60 - Understand the role of plasma in the transport of carbon dioxide, digested food, urea, hormones and heat energy. Specification Point 2.61 - Understand how adaptations of red blood cells make them suitable for the transport of oxygen, including shape, the absence of a nucleus and the presence of haemoglobin. Specification Point 2.62 - Understand how the immune system responds to disease using white blood cells, illustrated by phagocytes ingesting pathogens and lymphocytes releasing antibodies specific to the pathogen. Complete set of Chapter 3 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.55B - Understand how water is absorbed by root hair cells. Specification Point 2.56B - Understand that transpiration is the evaporation of water from the surface of a plant. Specification Point 2.57B - Understand how the rate of transpiration is affected by changes in humidity, wind speed, temperature and light intensity. Specification Point 2.58B - Practical: investigate the role of environmental factors in determining the rate of transpiration from a leafy shoot. Complete set of Chapter 3 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.51 - Understand why simple, unicellular organisms can rely on diffusion for movement of substances in and out of the cell. Specification Point 2.52 - Understand the need for a transport system in multicellular organisms. Specification Point 2.54 - Describe the role of xylem in transporting water and mineral ions from the roots to other parts of the plant. Specification Point 2.53 - Describe the role of phloem in transporting sucrose and amino acids between the leaves and other parts of the plant. Complete set of Chapter 3 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.46 - Describe the structure of the thorax, including the ribs, intercostal muscles, diaphragm, trachea, bronchi, bronchioles, alveoli and pleural membranes. Specification Point 2.47 - Understand the role of the intercostal muscles and the diaphragm in ventilation. Complete set of Chapter 3 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 2.40B - Understand the role of diffusion in gas exchange. Specification Point 2.41B - Understand gas exchange in relation to respiration and photosynthesis. Specification Point 2.42B - Understand how the structure of the leaf is adapted for gas exchange. Specification Point 2.43B - Describe the role of stomata in gas exchange. Complete set of Chapter 3 Lessons are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 26 - The Circulatory System. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.68 - Understand how the structure of arteries, veins and capillaries relate to their function. Specification Point 2.69 - Understand the general structure of the circulation system, including the blood vessels to and from the heart and lungs, liver and kidneys. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 25 - The Heart. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.65 - Describe the structure of the heart and how it functions. Specification Point 2.66 - Explain how the heart rate changes during exercise and under the influence of adrenaline. Specification Point 2.67 - Understand how factors may increase the risk of developing coronary heart disease. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Companion PDF worksheet for Edexcel IGCSE Biology Lecture 24 - Vaccination. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.63B - Understand how vaccination results in the manufacture of memory cells, which enable future antibody production to the pathogen to occur sooner, faster and in greater quantity. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 23 - The Blood. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.59 - Describe the composition of the blood: red blood cells, white blood cells, platelets and plasma. Specification Point 2.60 - Understand the role of plasma in the transport of carbon dioxide, digested food, urea, hormones and heat energy. Specification Point 2.61 - Understand how adaptations of red blood cells make them suitable for the transport of oxygen, including shape, the absence of a nucleus and the presence of haemoglobin. Specification Point 2.62 - Understand how the immune system responds to disease using white blood cells, illustrated by phagocytes ingesting pathogens and lymphocytes releasing antibodies specific to the pathogen. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 22 - Transpiration. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.55B - Understand how water is absorbed by root hair cells. Specification Point 2.56B - Understand that transpiration is the evaporation of water from the surface of a plant. Specification Point 2.57B - Understand how the rate of transpiration is affected by changes in humidity, wind speed, temperature and light intensity. Specification Point 2.58B - Practical: investigate the role of environmental factors in determining the rate of transpiration from a leafy shoot. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 21 - Transport Mechanisms. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.51 - Understand why simple, unicellular organisms can rely on diffusion for movement of substances in and out of the cell. Specification Point 2.52 - Understand the need for a transport system in multicellular organisms. Specification Point 2.54 - Describe the role of xylem in transporting water and mineral ions from the roots to other parts of the plant. Specification Point 2.53 - Describe the role of phloem in transporting sucrose and amino acids between the leaves and other parts of the plant. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 20 - The Alveoli and Lung Disease. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.48 - Explain how alveoli are adapted for gas exchange by diffusion between air in the lungs and blood in capillaries. Specification Point 2.49 - Understand the biological consequences of smoking in relation to the lungs and the circulatory system, including coronary heart disease. Specification Point 2.50 - Practical: Investigate breathing in humans, including the release of carbon dioxide and the effect of exercise. Complete set of Chapter 3 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 19 - Ventilation. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.46 - Describe the structure of the thorax, including the ribs, intercostal muscles, diaphragm, trachea, bronchi, bronchioles, alveoli and pleural membranes. Specification Point 2.47 - Understand the role of the intercostal muscles and the diaphragm in ventilation. Complete set of Chapter 3 Worksheets are available.