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(i) Excretion

Understand the origin of carbon dioxide and oxygen as waste products of metabolism and their loss from the stomata of a leaf.

Know the excretory products of the lungs, kidneys and skin (organs of excretion).

Understand how the kidney carries out its roles of excretion and osmoregulation.

Describe the structure of the urinary system, including the kidneys, ureters, bladder and urethra.

Describe the structure of a nephron, including the Bowman’s capsule and glomerulus, convoluted tubules, loop of Henle and collecting duct.

Describe ultrafiltration in the Bowman’s capsule and the composition of the glomerular filtrate.

Understand how water is reabsorbed into the blood from the collecting duct.

Understand why selective reabsorption of glucose occurs at the proximal convoluted tubule.

Describe the role of ADH in regulating the water content of the blood.

Understand that urine contains water, urea and ions.

Objective notes

10 learning objectives

272B Kidney excretion and osmoregulationUnderstand how the kidney carries out its roles of excretion and osmoregulation.View 273B Urinary system structureDescribe the structure of the urinary system, including the kidneys, ureters, bladder and urethra.View 274B Nephron structureDescribe the structure of a nephron, including the Bowman’s capsule and glomerulus, convoluted tubules, loop of Henle and collecting duct.View 275B UltrafiltrationDescribe ultrafiltration in the Bowman’s capsule and the composition of the glomerular filtrate.View 276B Water reabsorption from the collecting ductUnderstand how water is reabsorbed into the blood from the collecting duct.View 277B Selective reabsorption of glucoseUnderstand why selective reabsorption of glucose occurs at the proximal convoluted tubule.View 278B ADH and blood water contentDescribe the role of ADH in regulating the water content of the blood.View 279B Urine compositionUnderstand that urine contains water, urea and ions.View

ConceptIGCSE Biology