Kidney Function: Blood Flow and Filtration

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Questions and Answers

What is the primary function of the glomerulus in the nephron?

  • Regulation of blood flow
  • Filtration of blood plasma (correct)
  • Reabsorption of water and nutrients
  • Secretion of waste products

Which structure directly delivers blood away from the glomerulus?

  • Peritubular capillaries
  • Renal artery
  • Bowman's capsule
  • Efferent arteriole (correct)

What occurs during tubular reabsorption in the kidney?

  • Excess waste products are filtered from the blood
  • Essential substances are returned to the bloodstream (correct)
  • Glomerular filtrate is formed from blood plasma
  • Water and nutrients are secreted into the renal tubules

Which part of the nephron is responsible for concentrating urine?

<p>Loop of Henle (A)</p> Signup and view all the answers

Where does blood exit after passing through the peritubular capillaries?

<p>Renal vein (C)</p> Signup and view all the answers

What causes blood to flow into the glomerulus faster than it can leave?

<p>The larger size of the afferent arteriole compared to the efferent arteriole (D)</p> Signup and view all the answers

Which substances are prevented from being filtered through the glomerulus?

<p>Blood cells and most plasma proteins (B)</p> Signup and view all the answers

What does the term Glomerular Filtration Rate (GFR) refer to?

<p>The amount of fluid filtered by both kidneys per day (D)</p> Signup and view all the answers

What is the function of Bowman's capsule in the filtration process?

<p>To collect the fluid filtered from the glomerulus (B)</p> Signup and view all the answers

How much fluid is approximately filtered by the kidneys in a day?

<p>180 liters (A)</p> Signup and view all the answers

Flashcards

Afferent Arteriole

The blood vessel bringing blood into the glomerulus; larger than the efferent arteriole.

Efferent Arteriole

The blood vessel carrying blood away from the glomerulus; smaller than the afferent arteriole.

Glomerular filtration rate (GFR)

The rate at which fluid is filtered by both kidneys; approximately 180 liters per day.

Filtration of blood cells

Blood cells are too large to pass through the glomerular pores, so they are not filtered.

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Bowman's capsule

The cup shaped structure that receives the filtered fluid from the glomerulus.

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Nephron Function

Nephrons are the kidney's filtering units, responsible for blood filtration, water reabsorption, and waste removal.

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Glomerular Filtration

The process where water and small solutes are filtered from blood into Bowman's capsule, the first step in urine formation.

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Renal Tubules Role

Renal tubules are responsible for selectively reabsorbing essential substances and water back into the bloodstream and secreting additional wastes

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Peritubular Capillaries

Tiny blood vessels surrounding the renal tubules; responsible for reabsorbing water and solutes from the filtrate.

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Kidney Blood Supply

Renal artery delivers blood to the kidneys, branches into smaller arteries, then smaller veins to exit the kidneys via the renal vein.

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Study Notes

Blood Flow to Glomerulus

  • Blood flows into glomerulus through the afferent arteriole, much wider than the efferent arteriole.
  • Blood flows in faster than it can leave.
  • Blood cells and plasma proteins are too large to pass through the pores.

Filtration

  • The fluid that has filtered into Bowman's capsule flows into the renal tubules.
  • The amount of fluid filtered by both kidneys is about 180 liters each day. This is called the Glomerular Filtration Rate (GFR).

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