Excretory system - Practice 2 worksheet - Free Printable

Problem Analysis:

The worksheet focuses on the excretory system and its components, specifically the urinary system. The task involves identifying parts of the urinary system and understanding how it functions to remove waste from the body.

#### Key Components of the Urinary System:
1. Kidneys: Filter blood and produce urine.
2. Ureters: Tubes that transport urine from the kidneys to the bladder.
3. Bladder: A muscular sac that stores urine.
4. Urethra: The tube through which urine exits the body.
5. Urea: A waste product formed in the liver from nitrogenous waste.
6. Urine: The liquid waste consisting mainly of water, urea, salts, and other substances.

Solution:

#### Part 1: Fill in the blanks based on the descriptions:
1. Two ducts where urine travels to the bladder: Ureters
2. Where blood is filtered and waste is converted into urea: Liver
3. A muscular bag that holds urine: Bladder
4. A pair of bean-shaped organs that filter urea from the blood: Kidneys
5. The substance that the liver creates from nitrogen waste: Urea
6. How urine leaves the body: Urethra
7. A mixture of urea and water: Urine

#### Part 2: Complete the sentence about the process:
- Blood is filtered by the kidneys, which turns waste into a chemical called urea. Then the kidneys filter the urea out of the blood and mix it with water. The urine then travels through the ureters to the muscular bag called the bladder. The urine leaves the body through the urethra.

#### Part 3: Label the Urinary System Diagram:
1. Kidneys: The two bean-shaped organs at the top.
2. Ureters: The tubes connecting the kidneys to the bladder.
3. Bladder: The muscular sac located below the ureters.
4. Urethra: The tube extending from the bladder to the outside of the body.

#### Part 4: Label the Integumentary System Diagram:
This part appears to be unrelated to the excretory system but focuses on the integumentary system (skin). However, since the question only asks for the excretory system, we will focus on the urinary system.

Final Answer:

#### Part 1:
1. Ureters
2. Liver
3. Bladder
4. Kidneys
5. Urea
6. Urethra
7. Urine

#### Part 2:
Blood is filtered by the kidneys, which turns waste into a chemical called urea. Then the kidneys filter the urea out of the blood and mix it with water. The urine then travels through the ureters to the muscular bag called the bladder. The urine leaves the body through the urethra.

#### Part 3:
- Top left and right: Kidneys
- Middle left and right: Ureters
- Bottom center: Bladder
- Bottom right: Urethra

Final Boxed Answer:

\[
\boxed{
\text{1. Ureters, 2. Liver, 3. Bladder, 4. Kidneys, 5. Urea, 6. Urethra, 7. Urine}
}
\]