Chapter 10 excretion

Question 1

What is excretion?

Answer 1

Getting rid of metabolic waste products and toxic substances made by the organism

Question 2

what do the lungs excrete?

skin
Kidneys

Answer 2

CO2
sweat
urea

Question 3

What are the functions of a kidney?

Answer 3

Filters blood
Removes excess water and salts and all urea
Help maintain homeostasis

Question 4

What is filtered out of the blood in the Glomerulus into the cup of the bowman’s capsule?

Answer 4

H2O
salts
urea
glucose
amino acids

Question 5

How do the substances in the renal arteries get into the kidney tubule?

Answer 5

Ultra-filtration

small enough to fit through filter

Question 6

What remains in the blood and is not filtered out when passing through the glomerulus?

Answer 6

proteins and blood cells

Question 7

What substances are reabsorbed into the blood after the efferent arteriole and why? and how does this happen?

Answer 7

Some H2O, all glucose, amino acids and some salts because they are useful and needed
This happens via diffusion and active transport,
-Occurring by diffusion, selective re-absorption and osmosis

Question 8

What is ADH?

Answer 8

ADH controls water content - increases the permeability of the kidney tubules to water

Question 9

Why is excretion important?

Answer 9

to rid the body of harmful by-products created by its own vital activities

Question 10

name all the sections of the nephron which absorbs water

Answer 10

proximal convoluted tubule, loop of henle, distal convoluted tubule, collecting duct