CAIE A-Level Biology A2 14.1.6 Urine Formation Questions
Explain urine formation by ultrafiltration, selective reabsorption and secretion using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- A2
Exam points
- Explain urine formation by ultrafiltration, selective reabsorption and secretion.
CAIE A-Level Biology A2 14.1.6 Urine Formation Questions question 1
[Maximum number: 4]
The mammalian kidney is composed of many nephrons.
Describe the process of ultrafiltration in the nephron.
1 (diameter of lumen of) afferent arteriole wider than efferent arteriole ;
2 (leads to) high, blood / hydrostatic, pressure ;
3 plasma/fluid, passes through, gaps/fenestrations, between endothelial cells (of capillaries) ;
4 ref. to basement membrane acts as a, filter / selective barrier ;
5 red cells/large proteins/molecules greater than 68000 (MM), cannot pass through ;
6 podocytes qualified ;
7 (filtrate) passes into (renal) capsule ;
[max 4]
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