Demo

Question 1

What are the primary functions of the kidneys?

Answer 1

The kidneys help to maintain the right amount of water and remove waste substances from the blood

The kidneys are essential for homeostasis in the body.

Question 2

What must the body balance regarding water?

Answer 2

The body must balance the water coming in against the water going out

This balance is crucial for maintaining homeostasis.

Question 3

What ions need to be balanced in the body?

Answer 3

Sodium and other ions

Ions are taken into the body through food and absorbed into the blood.

Question 4

What can happen if the ion or water content of the body is wrong?

Answer 4

Too much or too little water could be drawn into cells by osmosis

This can lead to cell damage and affect their normal functioning.

Question 5

List three ways the body loses water.

Answer 5

• Through the skin in sweat
• From the lungs when breathing out
• From the kidneys in urine

Question 6

Can we control the amount of water lost from the lungs or skin?

Answer 6

No, we can’t control the amount of water lost from the lungs or the skin

The amount of water lost must be balanced by the amount we drink.

Question 7

What process do the kidneys use to filter blood?

Answer 7

Filtration

Filtration removes waste substances like excess water, ions, and urea from the blood.

Question 8

Define selective reabsorption.

Answer 8

The process where useful substances like glucose, some ions, and water are reabsorbed back into the blood

This process ensures that essential substances are not lost.

Question 9

What happens to cells if the body does not maintain its water balance?

Answer 9

Cells can become damaged and do not work as well as normal

Maintaining water balance is critical for cell health.

Question 10

What is dialysis?

Answer 10

A medical treatment for kidney failure that partially filters waste from the blood

Dialysis involves the use of a machine to remove waste substances from the blood.

Question 11

What happens to the blood during dialysis?

Answer 11

The blood passes through a machine and is partially filtered before being returned to the body

This process helps to manage kidney failure.

Question 12

What is produced when proteins are broken down?

Answer 12

Urea

Urea is a waste product that the kidneys help to eliminate.

Question 13

Fill in the blank: The kidneys produce over ______ liters of urine a year.

Answer 13

500

Question 14

True or False: The kidneys only filter waste substances from the blood.

Answer 14

False

The kidneys also help maintain water and ion balance.