The volume and concentration of a person's urine is regulated by homeostatic mechanisms to keep the blood concentration constant.
Complete the sentences below to describe how the body responds to a person drinking a large volume of water.
Use the words in the list:
If a person has consumed a large volume of water, the concentration of the blood decreases.
This is detected by receptors in the ............................. .
These receptors send a message to the ............................. .
This causes less ............................. to be released into the bloodstream.
Give one factor, other than high water intake, that could cause a person to produce a large volume of dilute urine.
Diabetes mellitus is a condition where a person's blood glucose concentration is very high, leading to glucose passing out in the urine.
Describe a chemical test that could be used to determine if a patient's urine contains glucose.
22 exam-style questions on OCR GCSE Biology 3.3 Maintaining internal environments, covering 3.3.1 Importance of a constant internal environment, 3.3.2 The skin and body temperature, 3.3.3 Insulin and blood sugar, 3.3.4 Glucagon and blood sugar, 3.3.5 Type 1 and type 2 diabetes, 3.3.6 Osmotic changes in body fluids, 3.3.7 Kidneys and water balance, 3.3.8 Structure of the kidney and tubule, 3.3.9 ADH and kidney tubule permeability, and 3.3.10 Responses to temperature and osmotic challenges. Each one has a worked solution and a mark scheme showing where the marks go.