section 3. (3) identify the role of the kidney in the excretory system of fish and mammals Flashcards

1
Q

What is the excretory system?

A

a group of organs that function together to remove metabolic wastes from the cells of an organism and expel them out of the system.

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2
Q

What is the function of the kidneys?

A

The kidneys are the main organ for removing nitrogenous wastes in vertebrates.

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3
Q

What are the 2 main functions of the kidneys?

A

1) filtration: excretion of nitrogenous wastes

2) osmoregulation: maintenance of a constant solute concentration in the body by excreting or reabsorbing water/salts

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4
Q

Where do the kidney’s main functions occur?

A

filtration and osmoregulation occur in the nephrons

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5
Q

What is the role of the kidneys in fish?

A

depends on the environment:

  • in freshwater fish: reabsorb salt
  • in saltwater fish: excrete excess salt and produce concentrated urine
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