Heart - how blood flows worksheet - Free Printable

Problem Analysis:

The image provided is a diagram of the human heart, and the task is to label the parts of the heart and answer questions related to blood circulation. Let's solve this step by step.

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Step 1: Labeling the Parts of the Heart

We will identify each numbered part in the diagram based on its anatomical location and function.

1. Number 1: This is the superior vena cava. It is a large vein that carries deoxygenated blood from the upper body into the right atrium of the heart.
2. Number 2: This is the inferior vena cava. It is a large vein that carries deoxygenated blood from the lower body into the right atrium of the heart.
3. Number 3: This is the right atrium. It is one of the four chambers of the heart and receives deoxygenated blood from the body via the superior and inferior venae cavae.
4. Number 4: This is the tricuspid valve. It is located between the right atrium and the right ventricle, allowing blood to flow from the atrium to the ventricle and preventing backflow.
5. Number 5: This is the pulmonary artery. It carries deoxygenated blood from the right ventricle to the lungs for oxygenation.
6. Number 6: This is the aorta. It is the largest artery in the body and carries oxygenated blood from the left ventricle to the rest of the body.
7. Number 7: This is the left atrium. It receives oxygenated blood from the lungs via the pulmonary veins.
8. Number 8: This is the mitral (bicuspid) valve. It is located between the left atrium and the left ventricle, allowing blood to flow from the atrium to the ventricle and preventing backflow.
9. Number 9: This is the pulmonary veins. They carry oxygenated blood from the lungs to the left atrium.

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Step 2: Answering the Questions About Blood Circulation

#### Question 1:
"Once _______ blood leaves the pulmonary artery, it goes into the _______. Here, blood absorbs _______ and expels _______."

- Deoxygenated blood leaves the pulmonary artery.
- It goes into the lungs.
- In the lungs, blood absorbs oxygen and expels carbon dioxide.

So, the completed sentence is:
- "Once deoxygenated blood leaves the pulmonary artery, it goes into the lungs. Here, blood absorbs oxygen and expels carbon dioxide."

#### Question 2:
"When _______ blood arrives at the aorta, it circulates through the _______ and lower body."

- Oxygenated blood arrives at the aorta.
- From the aorta, it circulates through the upper body and lower body.

So, the completed sentence is:
- "When oxygenated blood arrives at the aorta, it circulates through the upper body and lower body."

#### Question 3:
"From here, it returns to the superior and inferior _______ _______ and the process is repeated."

- The blood returns to the venae cavae (superior and inferior).

So, the completed sentence is:
- "From here, it returns to the superior and inferior venae cavae and the process is repeated."

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Final Answer:

1. Superior vena cava
2. Inferior vena cava
3. Right atrium
4. Tricuspid valve
5. Pulmonary artery
6. Aorta
7. Left atrium
8. Mitral (bicuspid) valve
9. Pulmonary veins

For the questions:
- "Once deoxygenated blood leaves the pulmonary artery, it goes into the lungs. Here, blood absorbs oxygen and expels carbon dioxide."
- "When oxygenated blood arrives at the aorta, it circulates through the upper body and lower body."
- "From here, it returns to the superior and inferior venae cavae and the process is repeated."

Final Answer Boxed:
\boxed{
\begin{aligned}
&\text{1. Superior vena cava} \\
&\text{2. Inferior vena cava} \\
&\text{3. Right atrium} \\
&\text{4. Tricuspid valve} \\
&\text{5. Pulmonary artery} \\
&\text{6. Aorta} \\
&\text{7. Left atrium} \\
&\text{8. Mitral (bicuspid) valve} \\
&\text{9. Pulmonary veins} \\
&\text{Once deoxygenated blood leaves the pulmonary artery, it goes into the lungs. Here, blood absorbs oxygen and expels carbon dioxide.} \\
&\text{When oxygenated blood arrives at the aorta, it circulates through the upper body and lower body.} \\
&\text{From here, it returns to the superior and inferior venae cavae and the process is repeated.}
\end{aligned}
}