Interactive worksheet on human body systems with labeled diagrams and fill-in-the-blank sections.

Let’s go step by step to fill in the table correctly.

We have 6 diagrams, each showing a different human body system. We need to identify:

1. Body system – What is the name of the system shown?
2. Function – What does this system do for the body?
3. Main organ involved – Which key organ(s) are part of this system?

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Diagram 1: Skeleton (bones)

- Body system: Skeletal System
- Function: Supports the body, protects organs, helps with movement (with muscles), makes blood cells.
- Main organ involved: Bones (like skull, ribs, spine, femur)

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Diagram 2: Brain and spinal cord (nervous tissue highlighted)

- Body system: Nervous System
- Function: Controls everything — thinking, moving, feeling, breathing, heartbeat. Sends messages through nerves.
- Main organ involved: Brain, Spinal Cord

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Diagram 3: Heart and blood vessels (red and blue lines = arteries and veins)

- Body system: Circulatory System (or Cardiovascular System)
- Function: Moves blood around the body to carry oxygen, nutrients, and waste.
- Main organ involved: Heart, Blood Vessels (arteries, veins)

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Diagram 4: Lungs (pink organs in chest)

- Body system: Respiratory System
- Function: Takes in oxygen from air and removes carbon dioxide when we breathe.
- Main organ involved: Lungs

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Diagram 5: Stomach, intestines, liver (digestive tract)

- Body system: Digestive System
- Function: Breaks down food so the body can use it for energy and growth. Gets rid of solid waste.
- Main organ involved: Stomach, Intestines, Liver, Esophagus

*(Note: The diagram shows esophagus → stomach → intestines → liver/gallbladder area)*

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Diagram 6: Muscles all over the body (red/brown tissue)

- Body system: Muscular System
- Function: Helps you move your body, stand up straight, pump blood (heart muscle), digest food (smooth muscle).
- Main organ involved: Muscles (skeletal, smooth, cardiac)

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Now let’s put it all together in order from left to right:

| Diagram | Body System | Function | Main Organ Involved |
|---------|------------------------|-----------------------------------------------|----------------------------------|
| 1 | Skeletal System | Supports body, protects organs, aids movement | Bones |
| 2 | Nervous System | Controls body functions, sends signals | Brain, Spinal Cord |
| 3 | Circulatory System | Transports blood, oxygen, nutrients | Heart, Blood Vessels |
| 4 | Respiratory System | Brings in oxygen, removes CO₂ | Lungs |
| 5 | Digestive System | Breaks down food, absorbs nutrients | Stomach, Intestines, Liver |
| 6 | Muscular System | Enables movement, posture, internal processes | Muscles |

✔ All answers checked and verified.

Final Answer:
Skeletal System – Supports body, protects organs, aids movement – Bones
Nervous System – Controls body functions, sends signals – Brain, Spinal Cord
Circulatory System – Transports blood, oxygen, nutrients – Heart, Blood Vessels
Respiratory System – Brings in oxygen, removes CO₂ – Lungs
Digestive System – Breaks down food, absorbs nutrients – Stomach, Intestines, Liver
Muscular System – Enables movement, posture, internal processes – Muscles