The Circulatory System Worksheet | PDF - Free Printable

Problem Analysis:

The worksheet provided is about the Circulatory System and involves three tasks:
1. Matching components of blood to their functions.
2. Filling in gaps in a passage about the circulatory system.
3. Labeling a diagram of the heart.

Let's solve each task step by step.

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Task 1: Match the components of blood to their functions.

#### Components of Blood:
- Red blood cells
- Platelets
- White blood cells
- Plasma

#### Functions:
- Causes the blood to clot to prevent loss
- Medium in which substances float or dissolve
- Fight invading pathogens
- Carry oxygen

#### Solution:
- Red blood cells: Carry oxygen (They contain hemoglobin, which binds to oxygen for transport.)
- Platelets: Causes the blood to clot to prevent loss (Platelets help form blood clots to stop bleeding.)
- White blood cells: Fight invading pathogens (They are part of the immune system and defend against infections.)
- Plasma: Medium in which substances float or dissolve (Plasma is the liquid component of blood that carries nutrients, hormones, waste products, etc.)

#### Final Answer:
- Red blood cell → carry oxygen
- Platelets → causes the blood to clot to prevent loss
- White blood cell → fight invading pathogens
- Plasma → medium in which substances float or dissolve

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Task 2: Fill in the gaps in the passage below.

#### Passage:
The circulatory system ________ substances around the body.
Blood vessels called ________ have thick muscular walls and transport blood away from the ________ to other tissues and organs.
Blood is taken from tissues to the heart by blood vessels called ________, which have larger lumens and thin walls.
________ are small vessels which exchange materials with tissues.

#### Solution:
1. The circulatory system ________ substances around the body.
- The circulatory system transports substances (e.g., oxygen, nutrients, hormones, waste) around the body.

2. Blood vessels called ________ have thick muscular walls and transport blood away from the ________ to other tissues and organs.
- Blood vessels called arteries have thick muscular walls and transport blood away from the heart to other tissues and organs.

3. Blood is taken from tissues to the heart by blood vessels called ________, which have larger lumens and thin walls.
- Blood is taken from tissues to the heart by blood vessels called veins, which have larger lumens and thin walls.

4. ________ are small vessels which exchange materials with tissues.
- Capillaries are small vessels that allow the exchange of materials (e.g., oxygen, nutrients, waste) between blood and tissues.

#### Final Answer:
- The circulatory system transports substances around the body.
- Blood vessels called arteries have thick muscular walls and transport blood away from the heart to other tissues and organs.
- Blood is taken from tissues to the heart by blood vessels called veins, which have larger lumens and thin walls.
- Capillaries are small vessels which exchange materials with tissues.

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Task 3: Label the diagram below.

#### Diagram:
The diagram shows the human heart with labeled parts. The heart has four chambers: two atria (top chambers) and two ventricles (bottom chambers). Arteries and veins are also visible.

#### Labels:
1. Aorta: The largest artery that carries oxygenated blood from the left ventricle to the rest of the body.
2. Pulmonary artery: Carries deoxygenated blood from the right ventricle to the lungs.
3. Superior vena cava: A large vein that returns deoxygenated blood from the upper body to the right atrium.
4. Inferior vena cava: A large vein that returns deoxygenated blood from the lower body to the right atrium.
5. Right atrium: Receives deoxygenated blood from the body via the superior and inferior vena cava.
6. Right ventricle: Pumps deoxygenated blood into the pulmonary artery.
7. Left atrium: Receives oxygenated blood from the lungs via the pulmonary veins.
8. Left ventricle: Pumps oxygenated blood into the aorta.

#### Final Answer:
- Top left: Superior vena cava
- Top center: Aorta
- Top right: Pulmonary artery
- Middle left: Right atrium
- Middle right: Left atrium
- Bottom left: Right ventricle
- Bottom right: Left ventricle
- Bottom center: Inferior vena cava

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Final Summary of Answers:

1. Matching:
- Red blood cell → carry oxygen
- Platelets → causes the blood to clot to prevent loss
- White blood cell → fight invading pathogens
- Plasma → medium in which substances float or dissolve

2. Passage:
- The circulatory system transports substances around the body.
- Blood vessels called arteries have thick muscular walls and transport blood away from the heart to other tissues and organs.
- Blood is taken from tissues to the heart by blood vessels called veins, which have larger lumens and thin walls.
- Capillaries are small vessels which exchange materials with tissues.

3. Labeling:
- Top left: Superior vena cava
- Top center: Aorta
- Top right: Pulmonary artery
- Middle left: Right atrium
- Middle right: Left atrium
- Bottom left: Right ventricle
- Bottom right: Left ventricle
- Bottom center: Inferior vena cava

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Final Answer Box:

\boxed{
\text{See detailed solutions above.}
}