Course Content
Form One Biology Essays
0/8
Describe the structural adaptations of the leaf to the process of photosynthesis
Discuss the light and dark stage of photosynthesis.
Explain why the following conditions are necessary for photosynthesis
Explain factors that affects enzyme controlled reactions.
Describe the dentition of carnivorous mammals and their adaptation to the mode of feeding
Describe the process through which a piece of ugali undergoes in man from the time of ingestion up to the time of absorption.
Describe the digestion of proteins and carbohydrates along the human gut.
Discuss the adaptations of the ileum to its functions
Form Two Biology Essays
0/28
Explain the adaptations of the root hairs to their function
Discuss the adaptations of xylem to its function
Describe ways in which the xylem is adapted to their function
Describe how water moves from the soil to the leaves in a tree.
Explain the environmental factors that increase the rate of transpiration
Explain the structural factors that increase the rate of transpiration
Describe the structural adaptations of the mammalian heart to its function
Describe double circulation in mammals
Describe the process of blood clotting
Describe the mechanism of opening and closing of the stomata using the photosynthetic theory
Describe the mechanism of opening and closing of the stomata using the starch-sugar interconversion theory
Describe how the mammalian gaseous exchange system adapted to its function
Describe how the lungs adapted to their function
Describe the mechanism of gaseous exchange in man
Describe the different ways in which carbon (IV) oxide is transported by blood.
Describe how are the respiratory surfaces in mammals adapted to their functions
Explain why plants lack elaborate excretory organs like those found in animals
Describe any excretory products in plants and give economic uses.
Describe how human skin is adapted to its functions   
Describe the functions of the mammalian skin in organisms.
Describe the role of the skin in excretion and homeostasis
Explain the role of the skin in thermoregulation.
Describe the process of urine formation in the mammalian kidneys
Explain the adaptations of Kidney tubules to their function 
Trace the shortest route for a molecule of urea from the site of manufacture until it reaches the urinary bladder
Explain how the osmotic pressure in the human blood is maintained at normal level
Outline and explain the various homeostatic functions of the liver in mammals
Explain the role of the following hormones during homeostasis
Form Three Biology Essays
0/1
Explain how abiotic factors affect plants
Form Four Biology Essays
Biology Essays
About Lesson

Describe double circulation in mammals


  • Deoxygenated blood from body tissues (except lungs) enters the heart via the right auricles through the vena cava; it flows to the right ventricle via the tricuspid valve. The right ventricle contracts pumping blood via the semi-lunar valves through the pulmonary artery to the lungs for oxygenation. The oxygenated blood from the lungs flows through the pulmonary vein to the left auricle via the bicuspid valve to the left ventricle. The left ventricle contracts pumping blood via the semilunar valves through the aorta to the rest of the body tissues.
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