Printable concept map worksheet designed to help students visualize and understand the different types of cellular transport mechanisms.

Since I can't view or access images directly, I can’t see the specific content of your uploaded image. However, based on your description and the text you've provided, it appears to be a concept mapping worksheet from a biology textbook (likely *Holt Biology* or similar) for Chapter 8: Cellular Transport and the Cell Cycle, focusing on transport through cell membranes.

Let me help you solve and explain this concept map step by step based on standard biological knowledge.

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🔍 Concept Map: Transport Through Membranes

We are asked to complete a concept map about how materials move across cell membranes, with categories like passive vs. active transport, energy requirements, and examples.

Here’s how the concept map likely looks and should be filled in:

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#### 🌐 Central Concept:
Transport through membranes

This splits into two main branches:

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✔ Branch 1: can be → active

- which requires → energy (ATP)
- and → moves materials against concentration gradient
- example → exocytosis / endocytosis / sodium-potassium pump

> 💡 Active transport moves substances from low to high concentration (against the gradient), requiring energy (ATP). Examples include:
> - Sodium-potassium pump (Na⁺/K⁺ ATPase)
> - Endocytosis (engulfing material into the cell)
> - Exocytosis (expelling material out of the cell)

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✔ Branch 2: can be → passive

- which requires → no energy (such as)
- examples →
- Diffusion
- Osmosis
- Facilitated diffusion

> 💡 Passive transport moves substances down their concentration gradient (high to low), without energy.

Now, let's break down the passive transport subcategories:

#### ➤ Diffusion
- to move materials from a region of → high concentration
- to a region of → low concentration
- Example: Oxygen entering cells

#### ➤ Osmosis
- A special case of diffusion involving water
- Water moves from an area of low solute concentration to an area of high solute concentration
- So:
- From a region of low solute concentration → to a region of high solute concentration

#### ➤ Facilitated Diffusion
- Uses carrier proteins or channel proteins
- Moves molecules like glucose or ions
- Still no energy required, just assisted movement
- Example: Glucose moving into cells via GLUT proteins

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🧩 Final Completed Concept Map (Text Version):

```
Transport through membranes
|
├── can be → ACTIVE
| |
| ├── which requires → ENERGY (ATP)
| |
| ├── and → moves materials against concentration gradient
| |
| └── example → Sodium-potassium pump / Exocytosis / Endocytosis
|
└── can be → PASSIVE
|
├── which requires → NO ENERGY (such as)
|
├── example → DIFFUSION
| |
| ├── to move materials from a region of → HIGH CONCENTRATION
| └── to a region of → LOW CONCENTRATION
|
├── example → OSMOSIS
| |
| ├── water moves from a region of → LOW SOLUTE CONCENTRATION
| └── to a region of → HIGH SOLUTE CONCENTRATION
|
└── example → FACILITATED DIFFUSION
|
└── uses carrier/channel proteins (e.g., glucose transporters)
```

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✔ Summary of Key Concepts:

| Type of Transport | Energy Required? | Direction of Movement | Examples |
|-----------------------|------------------|-------------------------------------|-----------------------------------|
| Active | Yes (ATP) | Against gradient (low → high) | Na⁺/K⁺ pump, endocytosis |
| Passive | No | With gradient (high → low) | Diffusion, osmosis, facilitated diffusion |

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📝 Tips for Filling In the Blanks:

If your worksheet has blank ovals labeled A–I, here’s how they might be filled:

- A: active
- B: passive
- C: energy (ATP)
- D: no energy (such as)
- E: diffusion
- F: osmosis
- G: facilitated diffusion
- H: high concentration
- I: low concentration

*(Note: The exact labels may vary slightly depending on the layout, but these are the standard terms.)*

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Let me know if you'd like this formatted as a printable diagram or need help drawing it!