Biology: The Human Excretory System Kidneys and Waste Removal
How kidneys filter blood and help the body remove waste
Biology: The Human Excretory System Kidneys and Waste Removal
How kidneys filter blood and help the body remove waste
Biology - Grade 4-5
- 1
What is the main job of the kidneys in the human body?
Think about cleaning something that is moving through the body.
The main job of the kidneys is to filter the blood, remove wastes and extra water, and help make urine. - 2
Fill in the blank: The liquid waste made by the kidneys is called ____.
The liquid waste made by the kidneys is called urine. - 3
Put these parts in the correct order for the path of urine: bladder, kidneys, ureters, urethra.
Start with the organ that makes urine.
The correct order is kidneys, ureters, bladder, and urethra. Urine is made in the kidneys, travels through the ureters, is stored in the bladder, and leaves the body through the urethra. - 4
Explain why the body needs to remove waste products from the blood.
The body needs to remove waste products from the blood because wastes can build up and make the body unhealthy if they are not removed. - 5
Which body part stores urine until a person is ready to go to the bathroom?
This organ can stretch like a small balloon.
The bladder stores urine until a person is ready to go to the bathroom. - 6
Choose the best answer: The ureters are tubes that carry urine from the A. bladder to the outside of the body, B. kidneys to the bladder, or C. stomach to the kidneys.
The correct answer is B. The ureters are tubes that carry urine from the kidneys to the bladder. - 7
True or false: The kidneys help keep the right amount of water in the body. Explain your answer.
Think about what might happen if you drink a lot of water.
This statement is true. The kidneys help keep the right amount of water by removing extra water in urine and saving water when the body needs it. - 8
A student says, "The kidneys only remove water from the body." Is the student correct? Explain.
The student is not correct. The kidneys remove extra water, but they also remove wastes and help balance minerals in the body. - 9
The excretory system works with the circulatory system. Explain how blood is involved in kidney function.
The kidneys act like a filter for something the heart pumps.
Blood carries wastes to the kidneys. The kidneys filter the blood and send cleaned blood back through the body. - 10
Look at this word list: kidneys, lungs, bladder, ureters, heart. Which three are parts of the urinary system?
The three parts of the urinary system are the kidneys, bladder, and ureters. These parts help make, move, and store urine. - 11
Why is drinking enough water important for healthy kidneys?
Water helps carry wastes away.
Drinking enough water is important because it helps the kidneys make urine and move wastes out of the body. - 12
Label the parts in a kidney and bladder diagram using these words: kidney, ureter, bladder, urethra.
The kidneys are the two bean-shaped organs near the back. The ureters are the tubes from the kidneys to the bladder. The bladder is the storage sac, and the urethra is the tube that carries urine out of the body. - 13
What might happen to urine color when a person is not drinking enough water?
More water usually makes urine lighter in color.
When a person is not drinking enough water, urine may become darker yellow because it has less water mixed with the waste. - 14
Complete the sentence: The excretory system helps the body stay healthy by removing waste and keeping body fluids in ____.
The excretory system helps the body stay healthy by removing waste and keeping body fluids in balance. - 15
Create a simple cause-and-effect statement using these words: kidneys, filter, blood, urine.
Use the words to show what the kidneys do and what is made.
A good cause-and-effect statement is: The kidneys filter the blood, so wastes and extra water can leave the body as urine.