Excretion
1. This question has 2 part(s).
1.1. Separate: Biology Only
The diagram shows a nephron from a human kidney.
(i) From which structure does ultrafiltration take place?
(1)
☐ | A | P |
☐ | B | Q |
☐ | C | R |
☐ | D | S |
(ii) From which structure is glucose reabsorbed?
(1)
☐ | A | Q |
☐ | B | R |
☐ | C | S |
☐ | D | U |
(iii) Which structure is the loop of Henle?
(1)
☐ | A | P |
☐ | B | R |
☐ | C | S |
☐ | D | U |
1.2. Separate: Biology Only
The table gives the mean values of mass filtered per day and excreted per day for different plasma components that are filtered and reabsorbed in the nephron.
Plasma component | Mass filtered per day in g | Mass excreted per day in g | Percentage reabsorbed |
|---|---|---|---|
Water | 180 000 | 1800 | 99.0 |
Sodium | 630 | 3.0 | 99.5 |
Glucose | 180 | 0 | 100.0 |
Urea | 54 | 44.0 |
(i) State what is meant by plasma components.
(1)
(ii) Calculate the mean mass of urea excreted per day.
Give your answer in g.
(2)
(iii) Explain why glucose is reabsorbed in the nephron.
(2)
(iv) The concentration of urine is determined by the volume of water present and the mass of dissolved substances.
A person eats a meal with a high protein and salt content and drinks a small volume of water.
Comment on how this may change the values in the table and the effect it will have on urine production.
(5)
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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