Excretory system

Question 1

What is Excretion?

Answer 1

Excretion is the process of removing waste products from the body.

Question 2

What wastes does Excretion include?

Answer 2

CO2, nitrogenous waste (urea), salt and water

Question 3

What are the wastes generated by?

Answer 3

This is primarily carried out by the lungs (respiratory system), the kidneys (urinary system), and the skin (integumentary system).

Question 4

What does the Liver play a vital role in?

Answer 4

the liver plays a vital role in converting toxic waste into less toxic material before it is removed from the body

Question 5

What is a waste produced produced by cellular respiration?

Answer 5

Carbon Dioxide

Question 6

What happens if CO2 is not removed from your body?

Answer 6

If CO2 is not removed from the body, it can change the pH of the blood and make it acidic.

Question 7

What does the level of CO2 in our blood influence?

Answer 7

breathing rate, as it is important that it is removed efficiently from the body.

Question 8

What do kidneys do?

Answer 8

Filter wastes from the blood

Question 9

What does each kidney contain and how much of them?

Answer 9

Each kidney contains 1 million nephrons, the tiny structures that filter waste like urea, salts and water out of the blood and create urine.

Question 10

What does Urine travel do?

Answer 10

Urine passes from the kidneys, down the ureters into the bladder

Question 11

What do the kidneys play an important role in?

Answer 11

The kidneys also play an important role in regulating the water balance of the body

Question 12

How does excretion occur through our skin?

Answer 12

Sweating

Question 13

Sweat will remove what wastes from our body?

Answer 13

Sweat will remove some water, salts and small amounts of urea from the body.

Question 14

What does the volume of water in our body do?

Answer 14

influences the concentration of the blood and other substances in it.

Question 15

What happens when there is more water in our bodies than we need?

Answer 15

the kidneys will remove the excess creating dilute urine.

Question 16

What happens when there is less water than our bodies need/we are low on water?

Answer 16

When the body doesn’t have enough water, e.g., lost from sweating, then the kidneys will create concentrated urine to keep as much water as possible in the body.

Question 17

What is the role of the liver?

Answer 17

Its role in excretion includes breaking down toxins (from drugs and other sources), breaking down excess amino acids into urea, which will be excreted by the kidneys.