Lesson 3.3: When Your Body Cannot Cope - Part 3

Your blood is carrying nutrients to your body cells all the time.  Your blood is also taking away the waste products produced by the cells.  How does your body get rid of the wastes that are collecting in your blood? 

Read Investigation 11-C on page 226. Then, answer the following questions.

 

Question 1. Which organ is responsible for filtering wastes from the blood?

Question 2. Perform the calculations as required in the investigation and record the results in the following table.

Substance Absorbed by the Blood

 Amount Initially Filtered Amount Returned Amount in Urine Percent Absorbed

Water

 100 L 99 L 100 L - 99 L = 1 L 99 L/ 100 L X 100% = 99%

Chloride ion

 370 g 364 g    

Glucose

 70 g 70 g    

Urea

 30 g 10 g    

Uric acid

 4 g 3.5 g    

Calcium ion

 10 g 9.85 g    

 

Question 3. Answer the Analyze question 1 on page 226.

Question 4. Answer the Extend Your Skills questions 2, 3, and 4 on page 226.

 

Check your answers with those that follow.

 

 

 

 

 

 

 

 

 

 

 

 

Answers to Questions:

Question 1. Which organ is responsible for filtering wastes from the blood?

Kidneys are responsible for filtering wastes from the blood.

Question 2.

Absorbed by the Blood

 Amount Initially Filtered Amount Returned Amount in Urine Percent Absorbed

Water

 100 L 99 L 100 L - 99 L = 1 L 99 L/ 100 L X 100% = 99%

Chloride ion

 370 g 364 g 370 g - 364 g = 6 g 364 g/370 g X 100% = 98.4%

Glucose

 70 g 70 g    

Urea

 30 g 10 g    

Uric acid

 4 g 3.5 g    

Calcium ion

 10 g 9.85 g 10 g - 9.85 g = 0.15 g 9.85 g/10 g X 100% = 98.5%

You noticed that the answers to three of these are missing.  You will be asked to complete the missing parts in the assignment, so keep your answers for the assignment.

Question 3. Answer the Analyze question 1 on page 226.

1. a.  Urea is removed from the blood in the greatest quantity.

1. b.  Water is returned to the blood in the greatest quantity.  Glucose is returned as the highest percentage.

Question 4. Answer the Extend Your Skills questions 2, 3, and 4 on page 226.

2.  Water is an important part of your body; as much water is recycled as possible.  If 100 L is filtered every day, only 1 L is removed.  Can you imagine if all this water was removed each day?  You would have to drink 100 L of water instead of 1 L!  Glucose is an energy nutrient and cannot be wasted; therefore, all glucose is returned to the blood.

3. a.  The glucose is transported to the body cells by the blood.

3. b.  Glucose is needed by the cells as an energy source.

4.  If your glucose level in your urine is high, you may have diabetes.  You might also have kidney problems.

 


Now, do Assignment 11C.  Page forward to access it.