• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Water diuresis

Extracts from this document...


1) What does the word 'diuresis' refer to? Diuresis refers to the increase in urine flow that are caused by diuretics which in turn causes higher urine release. 2) What are the particular characteristics of a 'water diuresis'? Water dieresis is the excretion of urine after drinking water; results from reduced secretion of the antidiuretic hormone of the neurohypophysis in response to the lowered osmotic pressure of the blood.When there is an increase in water uptake, hence the plasma osmolarity increases. The osmoreceptors in the anterior hypothalamus would then be suppressed and causes less ADH to be secreted from the posterior pituitary gland. This decreases the water permeability of the distal tubule and collecting duct causing lower water absorption. Besides that, the urine osmolarity would also decrease to a value lower than 30mOsm/kg H2O and there will be an increase in urine which is diluted. 3) In the table below record the details for each of the subjects in your group. If there were only 3 subjects in your group draw a line through the last row (Subject D). Subject Treatment Sex Body Weight (kg) Volume of Water Ingested (litres) A Control ( Richard ) M 70.5 0.546 B Vigorous exercise ( Ting Jun) M 63.0 0.756 C N/A N/A N/A N/A D N/A N/A N/A N/A Calculation: Volume of water ingested = body weight � 12mL = 70.5�12mL = 846ml=0.846L 4) ...read more.


60 20 20 20 20 20 Urine volume (ml) 200 110 200 290 160 30 Urine flow (ml/min) 3.30 5.50 10.00 14.50 8.00 1.50 Na+conc'n (mmol/litre) - - - - - - Na+ excretion rate (?mol/min) - - - - - - K+conc'n (mmol/litre) (Mg/L X dilution factor) / Mr 19.1 18.98 6.45 3.94 6.91 24.35 K+ excretion rate (?mol/min) (K+conc X Urine Flow) 63.03 104.39 64.50 57.13 55.28 36.53 Cl-conc'n (mmol/litre) 2.0 1.0 1.0 2.4 0.7 9.5 Cl-excretion rate (?mol/min) 6.60 5.50 10.00 34.80 5.60 14.25 6) What is meant by the term 'osmolality'? Osmolality is the concentration of the substances in 1L of water divided by its molecular weight. The units used would be mOsm/kg. 7) The average data from all subjects in the entire class (all three days) will be posted on the PHY2021 WebCT site. Use this class data to answer the following: (a) Describe what happens to the rate of urine production in the 2 different treatment groups. Based on the results, it can be concluded that the 2 treatment groups tested which were the control and the vigorous exercise displayed different amount in the production of urine. The exercise group showed a lower amount of production in urine as compared to the control(not subjected to any exercise) may be due to blood flow to the kidneys are reduced in order to get greater perfusion to the skeletal muscles. ...read more.


Gradually the urine production will increase as the baroceptors would detect a change in concentration and therefore suppresses the hypothalamus. This decreases the production of ADH and decreases the permeability of the collecting tubule causing less water to be reabsorbed. 12) What effect does alcohol have on water diuresis? (You might like to think about your own personal experience!) What is the mechanism of action of alcohol on water diuresis? The effects of alcohol is that it increases water dieresis as symptoms such as thirst and mild dehydration will be accounted for after consumption of alcohol. This is because alcohol will bind to the osmoreceptors in the hypothalamus which suppresses the firing rate of impulses by the osmoreceptors. Then, less ADH would be produced and thus lesser ADH would be able to bind with the vasopressin receptors which decreases the tubular permeability to water in the collecting duct. Water would not be retained in the body and thus secreted. 13) Fill in the following table. Stimulus Type/Site of Receptors ADH Response Physiological response on Urine Volume Physiological response on Blood Volume Increased osmolality (dehydration) Increased osmolality (dehydration) Osmoreceptors Increase ADH production to promote water uptake by binding on type 2 vasopressin receptors Decreases Decreased osmolality Decreased osmolality Osmoreceptors Decrease ADH production to inhibit water retention Increases Increased blood volume Increased blood volume Baroreceptors Decrease production of ADH, inhibit water retention Increases Decreased blood volume Decreased blood volume Baroreceptors Increase production of ADH, promote water uptake by binding on type 2 vasopressin receptors Decreases ?? ?? ?? ?? 2 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Exchange, Transport & Reproduction section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Exchange, Transport & Reproduction essays

  1. Marked by a teacher

    Investigate the water potential of celeriac.

    5 star(s)

    This was found using the following equation: Change in mass = mass after experiment - mass before experiment When I found the change in mass, I used this to calculate the percentage change in mass. This was found using the following equation: Percentage change in mass = change in mass/original

  2. Marked by a teacher

    What is Type 1 diabetes

    3 star(s)

    Secondary diabetes is also much like Type 2 diabetes. It is quite variable, depending on the underlying cause. Common symptoms of diabetes When blood glucose levels rise, one or more classical symptoms will appear, mainly due to blood sugar being secreted into the urine.

  1. Peer reviewed

    Effect of Caffeine on the Heart Rate of Daphnia

    3 star(s)

    Due to the fact that caffeine is primarily an antagonist of the central nervous system's receptors for the neurotransmitter adenosine, the bodies of individuals who regularly consume caffeine adapt to the continual presence of the drug by substantially increasing the number of adenosine receptors in the central nervous system.

  2. Investigation into the effects of different

    However, still lab coats and goggles should be worn. There is a risk of getting cuts with using glassware, plus a risk of breaking it. Care should be taken when sliding the coverslip onto the haemocytometer grid, as it is delicate and so could break easily.

  1. The Skeletal and Muscular System

    These joints are also known as freely moveable joints. Synovial joints are divided into the following sub-groups according to the type of movement they allow: a. Ball and Socket Joint. They consist of a ball like surface of bone that fits into the hollow cup shaped socket of another bone.

  2. Who should be eligible to receive IVF Treatment?

    and due to her being single, she may not be able to provide her baby and may need extra support. 4 Many people would say that she is not eligible for IVF treatment for many reasons with the old age.

  1. The aim of this practical is to develop further knowledge of the composition of ...

    test kits are outlined below; Albustix-immerse the albustix in the sample provided and withdraw immediately wiping off the excess urine along the side of the container as you do this. Place the strip horizontally and time for 60 seconds. After this time compare the colour of the test strip with the colour code on the container.

  2. Regulation and Control Homeostasis.

    Islets of Langerhan: * This is made up of two types of cells: ?-cells and �-cells. * ?-cells produce the hormone glucagon when the concentration of glucose in the blood is too low, and �-cells produce insulin when the concentration of glucose in the blood is too high.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work