Ch 52: Excretory System Flashcards Preview

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Flashcards in Ch 52: Excretory System Deck (13):
1

Why is the excretory system needed?

To maintain homeostasis of extracellular fluid

2

Function of the excretory system

To control solute concentration and composition of extracellular fluid by secreting excess solute, conserving valuable solutes or those in short supply, and eliminating toxic wastes

3

Nephrons

Basic functional unit of the kidney that filters out negative things in blood to get the right composition

4

Bowman's Capsule

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5

Renal tube

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6

Glomerulus

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7

Peritubular capillaries

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8

Distal convoluted tubule

Filters about 5%
Fine tunes the ionic composition
Abundant ion transporters

9

Proximal convolutes tubule

Actively transports sodium, glucose, and amino acids into the interstitial fluid
Abundant in aquaporins

10

Loop of Henle

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11

Collecting duct

Loses water due to concentration gradient

12

Aquaporins

Water channels

13

Renal failure

Salt and water retention -> high blood pressure
Urea retention -> uremic poisoning
Decreasing pH -> acidosis