Circulation Worksheet for 9th - Higher Ed | Lesson Planet - Free Printable

It looks like you've uploaded a worksheet titled "Circulation" from a biology or physiology lesson, likely related to the human circulatory system. Since I can't view images directly, I’ll help you solve the task based on typical content found in such worksheets.

Let me walk through what this worksheet probably contains and how to answer it:

---

Worksheet Title: Circulation

This is likely a fill-in-the-blank or labeling exercise about the human circulatory system, focusing on blood flow, heart structure, and circulation pathways.

Here’s a common format for such tasks:

---

#### Part A: Labeling Diagram
You're given a diagram of the heart with labeled parts (like atria, ventricles, valves, arteries, veins). The instructions might say:

> "Label the following parts on the diagram: right atrium, right ventricle, left atrium, left ventricle, pulmonary artery, pulmonary vein, aorta, vena cava, tricuspid valve, bicuspid valve, semilunar valves."

How to solve:
- Recall that:
- The right side of the heart pumps deoxygenated blood to the lungs.
- The left side pumps oxygenated blood to the body.
- Atria receive blood; ventricles pump it out.
- Pulmonary artery carries deoxygenated blood from the heart to the lungs.
- Pulmonary vein brings oxygenated blood from the lungs to the heart.
- Aorta is the main artery from the left ventricle to the body.
- Vena cava returns deoxygenated blood from the body to the right atrium.

Use these facts to label correctly.

---

#### Part B: Fill-in-the-Blanks

Let’s assume the questions are something like:

1. Blood enters the heart through the vena cava and flows into the right atrium.
2. From there, it passes through the tricuspid valve into the right ventricle.
3. The pulmonary artery carries blood to the lungs.
4. Oxygenated blood returns via the pulmonary veins to the left atrium.
5. It moves through the bicuspid (mitral) valve into the left ventricle.
6. The aorta carries oxygenated blood to the body.
7. The semilunar valves prevent backflow from the arteries into the ventricles.

---

#### Part C: Questions

Q1: What is the function of the valves in the heart?
→ *To prevent backflow of blood, ensuring one-way flow through the heart.*

Q2: Why is the left ventricle thicker than the right ventricle?
→ *Because the left ventricle pumps blood to the entire body (systemic circulation), which requires more force than pumping to the lungs (pulmonary circulation).*

Q3: What is the difference between systemic and pulmonary circulation?
→ *Systemic circulation: carries oxygenated blood from the heart to the body and returns deoxygenated blood back. Pulmonary circulation: carries deoxygenated blood from the heart to the lungs and returns oxygenated blood back.*

---

✔ Final Answer Summary (Example):

If your worksheet has these types of questions, here’s how to answer them:

1. Right atrium → Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium → Left ventricle → Aorta → Body
2. Valves prevent backflow.
3. Left ventricle is thicker because it pumps blood throughout the body.
4. Systemic circulation = body; Pulmonary circulation = lungs.

---

If you can describe the exact questions or provide the text from the image, I can give you the precise answers tailored to your worksheet!