Nephron and Urine Composition
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Questions and Answers

What is the function of the glomerulus in the nephron?

  • Producing urine
  • Reabsorbing water
  • Regulating urine pH
  • Filtering blood to create filtrate (correct)
  • What does the presence of leukocytes in urine indicate?

  • Dehydration
  • Excessive protein intake
  • Urinary tract infection (correct)
  • High glucose levels
  • What does the presence of ketones in urine suggest?

  • Low carbohydrate intake (correct)
  • Excessive protein intake
  • High glucose levels
  • Normal metabolic state
  • Which food group tends to lower urine pH?

    <p>Meats</p> Signup and view all the answers

    What is the term used to describe the absence of urine production?

    <p>Anuria</p> Signup and view all the answers

    Which sphincter controls the release of urine from the bladder to outside the body?

    <p>External urinary sphincter</p> Signup and view all the answers

    What is the medical term for urination?

    <p>Micturition</p> Signup and view all the answers

    Which organ receives about 25% of cardiac output while at rest?

    <p>Kidneys</p> Signup and view all the answers

    What causes aquaporin channel proteins to work on the cell membrane and pull water back into the interstitial spaces for reabsorption?

    <p>ADH</p> Signup and view all the answers

    What is the glomerular filtration rate a measure of?

    <p>Rate of filtration per minute</p> Signup and view all the answers

    What is responsible for the reabsorption of most water before it reaches the collecting ducts?

    <p>Proximal convoluted tubule</p> Signup and view all the answers

    What is responsible for recovering most of the solutes and water from the nephron and returning them back into circulation?

    <p>Capillaries</p> Signup and view all the answers

    What happens when osmolarity is high in the body?

    <p>Cells contract to form less urine</p> Signup and view all the answers

    Which structure in the kidney has a lot of mitochondria to produce enough ATP?

    <p>Nephron</p> Signup and view all the answers

    What will systemic edema result from?

    <p>Low protein levels in the blood</p> Signup and view all the answers

    Which cells in the kidney respond to ATP and adenosine by either contracting or relaxing?

    <p>Juxtaglomerular cells</p> Signup and view all the answers

    What is the primary role of the Loop of Henle in the nephron?

    <p>Reabsorb water and some sodium</p> Signup and view all the answers

    Which hormone increases the number of sodium pumps in the DCT (Distal Convoluted Tubule)?

    <p>Aldosterone</p> Signup and view all the answers

    What is the main function of the ADH (Anti-diuretic hormone) in the kidneys?

    <p>Increase water reabsorption</p> Signup and view all the answers

    Which mechanism involves smooth muscle contraction or relaxation based on blood pressure and flow rate to regulate urine production?

    <p>Myogenic mechanism</p> Signup and view all the answers

    What is the impact of progesterone on kidney function?

    <p>Promotes water retention</p> Signup and view all the answers

    Which hormone inhibits aldosterone, allowing sodium to leave and water to be excreted?

    <p>Natriuretic hormones</p> Signup and view all the answers

    How do diuretics affect urine volume?

    <p>Increase urine volume</p> Signup and view all the answers

    What is the primary role of endothelins in kidney function?

    <p>Cause vasoconstriction</p> Signup and view all the answers

    Which mechanism involves the adjustment of water and osmolarity balance in the collecting ducts?

    <p>Renin-angiotensin-aldosterone system</p> Signup and view all the answers

    What happens to urine color when Anti-diuretic hormone (ADH) is actively working in our bodies?

    <p>Urine is dark</p> Signup and view all the answers

    What is the role of calcitriol?

    <p>Regulates calcium in the blood</p> Signup and view all the answers

    Which of the following best describes the function of erythropoietin (EPO)?

    <p>Increases erythrocyte production</p> Signup and view all the answers

    Why is it suggested by some scientists that vitamin D should be referred to as a hormone and not a vitamin?

    <p>It regulates calcium in the blood</p> Signup and view all the answers

    What is the main function of aldosterone in kidney regulation?

    <p>Balances water and solutes in the blood stream</p> Signup and view all the answers

    How does EPO respond under conditions of low oxygen concentration?

    <p>Increases red blood cell production</p> Signup and view all the answers

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