Diabetes insipidus is a condition in which the individual produces large amounts of urine. The volume of urine produced by a patient who has diabetes insipidus, was recorded each day. On certain days, the patient was given an injection of pituitary extract. The results of the study are recorded in Table 1. TABLE 1 Day Volume of urine/dm3 1 5.4 2 6.0 3 5.8 4 5.0 5 7.0 6 5.7 7* 1.9 8 2.2 9 6.3 10 4.9 11 5.1 12 5.5 13* 1.5 14* 2.1 15* 2.4 16* 1.7 N.B. The asterisks indicate the days on which the patient was given the pituitary extract. (i)What effect does the pituitary extract have on the volume of urine produced each day? (ii)State the name of the substance that is responsible for this effect? (iii)Describe how this effect is brought about?
Diabetes insipidus is a condition in which the individual produces large amounts of urine.
The volume of urine produced by a patient who has diabetes insipidus, was recorded each day. On certain days, the patient was given an injection of pituitary extract. The results of the study are recorded in Table 1.
TABLE 1
Day |
Volume of urine/dm3 |
1 |
5.4 |
2 |
6.0 |
3 |
5.8 |
4 |
5.0 |
5 |
7.0 |
6 |
5.7 |
7* |
1.9 |
8 |
2.2 |
9 |
6.3 |
10 |
4.9 |
11 |
5.1 |
12 |
5.5 |
13* |
1.5 |
14* |
2.1 |
15* |
2.4 |
16* |
1.7 |
N.B. The asterisks indicate the days on which the patient was given the pituitary extract.
(i)What effect does the pituitary extract have on the volume of urine produced each day?
(ii)State the name of the substance that is responsible for this effect?
(iii)Describe how this effect is brought about?
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