Biology Chapter: Nitrogenous Waste and Kidney Function
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Questions and Answers

What is the most toxic form of nitrogenous waste that requires a large amount of water for elimination?

  • Uric Acid
  • Carbon Dioxide
  • Ammonia (correct)
  • Urea

Which group of animals is primarily associated with ureotelism?

  • Mammals and many terrestrial amphibians (correct)
  • Bony fishes
  • Reptiles and birds
  • Aquatic insects

How do ammonotelic animals primarily excrete ammonia?

  • By diffusion across body surfaces or gills (correct)
  • As pellets or pastes to conserve water
  • Through specialized excretory organs like kidneys
  • By converting it to urea first

Which nitrogenous waste is excreted with minimal water loss, often in the form of pellets or pastes?

<p>Uric Acid (C)</p> Signup and view all the answers

What process do ureotelic animals primarily use to convert ammonia into a less toxic substance?

<p>Conversion to urea in the liver (B)</p> Signup and view all the answers

Which part of the kidney contains the structures known as calyces?

<p>Renal pelvis (B)</p> Signup and view all the answers

What is the approximate weight range of an adult human kidney?

<p>120-170 g (A)</p> Signup and view all the answers

Which of the following represents the correct anatomical location of the kidneys?

<p>Between the last thoracic vertebra and third lumbar vertebra (B)</p> Signup and view all the answers

Which layer surrounds and protects the kidney?

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

What term describes the inner section of the kidney where medullary pyramids are located?

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

Which structure carries blood away from the glomerulus?

<p>Efferent arteriole (A)</p> Signup and view all the answers

What is the primary function of the proximal convoluted tubule (PCT)?

<p>Reabsorbing nutrients from filtrate (D)</p> Signup and view all the answers

What component of the nephron encloses the glomerulus?

<p>Bowman's capsule (A)</p> Signup and view all the answers

Which section of the nephron is specifically involved in the formation of urine through the process of filtration?

<p>Glomerulus (D)</p> Signup and view all the answers

What structures make up the renal corpuscle?

<p>Bowman's capsule and glomerulus (D)</p> Signup and view all the answers

Which statement accurately describes the structure of Henle's loop?

<p>Henle's loop has both ascending and descending limbs. (D)</p> Signup and view all the answers

What is the primary function of the distal convoluted tubule (DCT) in the nephron?

<p>Reabsorption of water and electrolytes. (B)</p> Signup and view all the answers

Which of the following statements is true regarding cortical and juxtamedullary nephrons?

<p>Juxtamedullary nephrons primarily function in urine concentration. (C)</p> Signup and view all the answers

In which process do substances move from the blood into the filtrate in the nephron?

<p>Secretion. (A)</p> Signup and view all the answers

What role does the peritubular capillary network play in renal physiology?

<p>To facilitate reabsorption and secretion around renal tubules. (B)</p> Signup and view all the answers

Flashcards

Nitrogenous Waste Elimination

The process of removing nitrogenous waste products from the body.

Ammonia

The most common type of nitrogenous waste produced in animals, primarily excreted by bony fishes, aquatic amphibians, and aquatic insects.

Urea

The nitrogenous waste produced by mammals, amphibians, and marine fish.

Uric acid

The nitrogenous waste product excreted by reptiles, birds, and insects, minimizing water loss.

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Ammonotelic

Animals that excrete ammonia as their primary nitrogenous waste product.

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What are kidneys?

A reddish-brown, bean-shaped organ that filters waste products from the blood and produces urine.

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What is a nephron?

The functional unit of the kidney responsible for filtering waste products from blood and producing urine.

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What is the renal cortex?

The outer layer of the kidney where blood vessels and nephrons are located.

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What is the renal medulla?

The inner region of the kidney that contains collecting ducts and pyramids.

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What is the renal pelvis?

A funnel-shaped space in the kidney that collects urine before it passes to the ureter.

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Nephron

The basic functional unit of a kidney, responsible for filtering waste and regulating blood volume.

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Glomerulus

A ball-shaped network of capillaries within the nephron where filtration of blood begins.

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Bowman's capsule

A cup-shaped structure that encloses the glomerulus, collecting the filtered fluid (filtrate).

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Proximal convoluted tubule (PCT)

The first part of the renal tubule, where most reabsorption of nutrients and water occurs.

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Loop of Henle

The U-shaped loop within the nephron, responsible for concentrating the filtrate and creating a concentration gradient.

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What is Henle's loop?

A hairpin-shaped loop in the nephron that plays a crucial role in regulating water and ion concentration in the urine. It consists of a descending limb and an ascending limb.

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What is the Distal Convoluted Tubule (DCT)?

The section of the nephron that connects to the collecting duct. It plays a role in fine-tuning the composition of urine by reabsorbing or secreting substances.

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What are cortical nephrons?

These nephrons have a short loop of Henle that doesn't extend deep into the medulla. They primarily reabsorb water and solutes.

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What are juxtamedullary nephrons?

These nephrons have a long loop of Henle that extends deep into the medulla. They play a vital role in concentrating urine.

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What is the peritubular capillary network?

A network of capillaries that surrounds the renal tubules and helps reabsorb essential substances from the filtrate. It plays a crucial role in maintaining blood volume and composition.

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