Label the nephron diagram - a biology worksheet for students to identify parts of the human excretory system.

Let's solve this step-by-step by identifying each labeled part (1–10) in the nephron diagram and matching it with the correct structure from the list.

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🔍 Step 1: Understand the Nephron Structure

The nephron is the functional unit of the kidney. It consists of:

- Glomerulus: A network of capillaries where filtration occurs.
- Bowman’s capsule: Surrounds the glomerulus; collects filtrate.
- Proximal convoluted tubule (PCT): Reabsorption begins here.
- Loop of Henle: Has descending and ascending limbs; helps concentrate urine.
- Distal convoluted tubule (DCT): Final reabsorption and secretion.
- Collecting duct: Collects urine from multiple nephrons.
- Blood vessels:
- Afferent arteriole: Brings blood to glomerulus.
- Efferent arteriole: Carries blood away from glomerulus.
- Vasa recta: Capillaries around loop of Henle; involved in countercurrent exchange.

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🧩 Step 2: Match Labels (1–10) to Structures

Now, analyze the diagram:

#### Label 1: Top red vessel entering the glomerulus
- This is the afferent arteriole — brings blood into the glomerulus.
✔ Answer: 1 → Afferent Arteriole

#### Label 2: Yellow tube just after Bowman’s capsule
- This is the proximal convoluted tubule (PCT).
✔ Answer: 2 → Proximal Convoluted Tubule

#### Label 3: Long yellow U-shaped loop
- This is the loop of Henle, specifically the descending limb (thick segment).
- But label 3 points to the descending limb of Henle’s loop.
✔ Answer: 3 → Descending limb of Henle’s loop

#### Label 4: Long straight yellow tube at bottom
- This is the collecting duct, which receives fluid from many nephrons.
✔ Answer: 4 → Collecting Duct

#### Label 5: Red capillary network surrounding the loop of Henle
- These are vasa recta, peritubular capillaries that run alongside the loop of Henle.
✔ Answer: 5 → Vasa recta

#### Label 6: Thin descending limb of Henle’s loop
- This is the descending limb of Henle’s loop (thin segment).
But wait — we already used 3 for descending limb? Let’s check again.

Wait! The diagram shows:
- Label 3: Points to a curved portion — likely distal convoluted tubule or ascending limb?

Let’s re-evaluate carefully.

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✔ Detailed Analysis Based on Standard Nephron Diagram:

Let’s go from top to bottom:

#### Label 1: Red vessel entering the glomerular knot
→ Afferent arteriole
✔ 1 → Afferent Arteriole

#### Label 2: Yellow tube coming out of Bowman’s capsule
→ Proximal convoluted tubule (PCT)
✔ 2 → Proximal Convoluted Tubule

#### Label 3: Descending limb of Henle’s loop (thin segment)
This is the thin, straight part going down into the medulla.
✔ 3 → Descending limb of Henle’s loop

#### Label 4: Collecting duct – long straight yellow tube at the end
✔ 4 → Collecting Duct

#### Label 5: Vasa recta – red capillaries wrapping around the loop of Henle
✔ 5 → Vasa recta

#### Label 6: Ascending limb of Henle’s loop – thin then thick segment going up
→ This is Ascending limb of Henle’s loop
✔ 6 → Ascending limb of Henle’s loop

#### Label 7: Distal convoluted tubule – curved yellow tube before collecting duct
✔ 7 → Distal Convoluted Tubule

#### Label 8: Bowman’s capsule – cup-like structure surrounding glomerulus
✔ 8 → Bowman’s capsule

#### Label 9: Glomerulus – the knot of capillaries inside Bowman’s capsule
✔ 9 → Glomerulus

#### Label 10: Efferent arteriole – red vessel leaving the glomerulus
✔ 10 → Efferent Arteriole

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✔ Final Matching:

| Structure | Number |
|-------------------------------|--------|
| Afferent Arteriole | 1 |
| Collecting Duct | 4 |
| Efferent Arteriole | 10 |
| Distal Convoluted Tubule | 7 |
| Bowman’s capsule | 8 |
| Vasa recta | 5 |
| Glomerulus | 9 |
| Descending limb of Henle’s loop | 3 |
| Proximal Convoluted Tubule | 2 |
| Ascending limb of Henle’s loop | 6 |

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📝 Fill in the Blanks:

Now fill in the blanks as per the instructions:

- Afferent Arteriole → 1
- Collecting Duct → 4
- Efferent Arteriole → 10
- Distal Convoluted Tubule → 7
- Bowman’s capsule → 8
- Vasa recta → 5
- Glomerulus → 9
- Descending limb of Henle’s loop → 3
- Proximal Convoluted Tubule → 2
- Ascending limb of Henle’s loop → 6

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✔ Answer Key:

```
Afferent Arteriole → 1
Collecting Duct → 4
Efferent Arteriole → 10
Distal Convoluted Tubule → 7
Bowman’s capsule → 8
Vasa recta → 5
Glomerulus → 9
Descending limb of Henle’s loop → 3
Proximal Convoluted Tubule → 2
Ascending limb of Henle’s loop → 6
```

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🎉 Summary

You’ve successfully labeled the nephron! This diagram illustrates the key components involved in filtration, reabsorption, and secretion in the kidney. Understanding these structures is crucial for grasping how the body maintains water balance and removes waste.

Happy learning! 😊