Activity 1: Identify heart structure parts on the labeled diagram.

It looks like you're working on an interactive educational activity about the structure of the human heart, where you need to label parts A through M on a diagram of the heart. Since I can't view images directly, I’ll guide you through how to solve this task based on typical heart anatomy and common labeling in such diagrams.

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🔍 Step-by-Step Guide to Labeling the Heart (A–M)

Below is a standard anatomical breakdown of the heart’s structures that are usually labeled in such activities. Based on the layout of most heart diagrams, here's what each letter likely represents:

> ⚠️ Note: The exact labels depend on the diagram's orientation and which parts are marked. But here’s a common configuration:

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#### Common Labels for Heart Structures (A–M):

| Letter | Structure Name | Description |
|--------|----------------------------------|-----------|
| A | Superior Vena Cava | Large vein bringing deoxygenated blood from upper body to right atrium. |
| B | Inferior Vena Cava | Large vein bringing deoxygenated blood from lower body to right atrium. |
| C | Right Atrium | Receives deoxygenated blood from vena cavae. |
| D | Right Ventricle | Pumps deoxygenated blood to lungs via pulmonary artery. |
| E | Pulmonary Artery | Carries deoxygenated blood from right ventricle to lungs. |
| F | Pulmonary Veins | Bring oxygenated blood from lungs to left atrium (usually two shown). |
| G | Left Atrium | Receives oxygenated blood from pulmonary veins. |
| H | Left Ventricle | Pumps oxygenated blood to body via aorta. |
| I | Aorta | Largest artery; carries oxygenated blood from left ventricle to body. |
| J | Tricuspid Valve | Between right atrium and right ventricle. |
| K | Pulmonary Valve | Between right ventricle and pulmonary artery. |
| L | Mitral (Bicuspid) Valve | Between left atrium and left ventricle. |
| M | Aortic Valve | Between left ventricle and aorta. |

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✔ How to Use This:

1. Look at your diagram and match each letter (A–M) with the corresponding structure.
2. Type the correct name into the input field next to each letter.
3. Click CHECK to verify your answers.
4. If any are incorrect, review the location and function of the structure.

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🧠 Tips:

- Deoxygenated blood enters the heart via vena cavae → right side.
- Oxygenated blood returns from lungs via pulmonary veins → left side.
- Valves prevent backflow:
- Atrioventricular valves (tricuspid & mitral) between atria and ventricles.
- Semilunar valves (pulmonary & aortic) at the exits of the ventricles.

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📌 Example Answer Format:

If the diagram shows:
- A = Superior Vena Cava
- B = Inferior Vena Cava
- C = Right Atrium
- D = Right Ventricle
- E = Pulmonary Artery
- F = Pulmonary Vein
- G = Left Atrium
- H = Left Ventricle
- I = Aorta
- J = Tricuspid Valve
- K = Pulmonary Valve
- L = Mitral Valve
- M = Aortic Valve

Then type those names accordingly.

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✔ After typing all labels, click "CHECK" — if any are wrong, your teacher or system will flag them. Review the feedback and discuss with your teacher as instructed.

Let me know if you can describe the positions of the letters (e.g., “A is at the top near the head”), and I can give more precise help!