Excretion in humans (kidneys and skin) — KCSE Biology
KCSE Biology · 98 practice questions · 4 syllabus objectives
What You'll Learn
Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.
Draw and label the human kidney and nephron
Describe the process of urine formation in the nephron
State the excretory function of the skin
Excretion in humans (kidneys and skin)
Sample Questions
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The human body relies on various organs to maintain homeostasis, particularly in the removal of waste products. Understanding the structure and function of the kidneys and their associated blood vessels is essential in appreciating the excretory system's role in overall health. (a) Name the blood vessel that transports blood to the kidney. (1 mark) (b) Name the blood vessel that transports blood away from the kidney. (1 mark) (c) State one difference in composition between the blood in these two vessels. (2 marks)
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The human body relies on various organs to maintain homeostasis, with particular emphasis on the role of the kidneys in waste management. Understanding the structure and function of these vital organs is essential for comprehending their contribution to overall health. (a) Name the basic functional unit of the kidney. (1 mark) (b) State the approximate number of these units found in each human kidney. (1 mark) (c) State the overall function of the kidney in human physiology. (2 marks)
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The human body relies on various organs to maintain homeostasis, particularly through the removal of waste products. Understanding the structure and function of the nephron is essential in appreciating how these processes occur within the renal system. (a) Name four parts of a nephron in the order that filtrate passes through them. (4 marks) (b) State which parts of the nephron are located in the cortex and which are in the medulla. (2 marks)
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The skin plays a crucial role in maintaining homeostasis and protecting the body from external elements. Understanding its structure and functions is essential for appreciating how it contributes to the overall excretory system. (a) Identify the layer of the epidermis where cells are constantly dividing and being replaced. (1 mark) (b) Identify the outermost layer of the epidermis that is made of dead, flattened cells. (1 mark) (c) State the function of the dead cell layer. (1 mark) (d) Name the protein that makes these dead cells tough and waterproof. (1 mark)
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