Menstrual Cycle Worksheet Science 5 Second Grading Period | PDF - Free Printable

Let's solve this Menstrual Cycle Worksheet step by step, explaining each part clearly.

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A. Execute the given directions on the following diagram

The diagram is a circular chart representing the 28-day menstrual cycle, with days numbered from 1 to 28.

#### Instructions:
1. Red marker: Shade the dates when bleeding (menstruation) occurs.
→ This happens during Day 1–5.
✔ Shade Days 1 to 5 in red.

2. Pink marker: Shade the dates when ovulation occurs.
→ Ovulation typically happens around Day 14 (midway through the cycle).
✔ Shade Day 14 in pink.

3. Violet marker: Shade the dates when the lining of the uterus begins to thicken after bleeding.
→ After menstruation (Day 5), the endometrium starts rebuilding. This is the follicular phase, beginning around Day 6–10.
✔ Shade Days 6–10 in violet.

4. Green marker: Shade the dates when the egg is released (ovulation).
→ As mentioned above, ovulation occurs on Day 14.
✔ Shade Day 14 in green.

5. Yellow marker: Shade the dates when the lining of the uterus is very thick.
→ The lining becomes thick during the luteal phase, just before menstruation. This is around Day 21–28.
✔ Shade Days 21–28 in yellow.

> 🔹 Note: Some colors may overlap (e.g., Day 14 is both ovulation and possibly thickening), but follow the instructions carefully.

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B. Complete the flow chart of the Menstrual Cycle

We have 5 boxes with timeframes:

- Day 1–5
- Day 6–10
- Day 11–15
- Day 16–24
- Day 24–28

And clues below:

- Uterine lining breaks down. Bleeding occurs.
- The endometrium starts to grow and thickens again after bleeding.
- Mature egg is released by the ovary.
- Egg moves to the uterus. Uterine lining thickens again.
- Uterine lining detaches leading to menstruation.

Let’s match each phase:

1. Day 1–5: Uterine lining breaks down → Menstruation
2. Day 6–10: Endometrium starts to grow → Proliferative Phase (Follicular Phase)
3. Day 11–15: Mature egg is released → Ovulation
4. Day 16–24: Egg moves to uterus, lining thickens → Secretory Phase (Luteal Phase)
5. Day 24–28: Lining detaches → Menstruation (again, leading into next cycle)

But wait — the flowchart shows arrows forming a cycle, so we need to fill them logically.

Let’s place the correct labels:

- Day 1–5: Menstruation
- Day 6–10: Proliferative Phase
- Day 11–15: Ovulation
- Day 16–24: Secretory Phase
- Day 24–28: Menstruation (preparation for next cycle)

✔ So the flowchart should be:

```
[Day 1–5] → [Day 6–10] → [Day 11–15] → [Day 16–24] → [Day 24–28]
↓ ↑
└───────────────────────────┘
```

Labels:
- Day 1–5: Menstruation
- Day 6–10: Proliferative Phase
- Day 11–15: Ovulation
- Day 16–24: Secretory Phase
- Day 24–28: Menstruation (or "End of Cycle")

> 📌 Note: Day 24–28 overlaps with the start of menstruation, so it completes the cycle.

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C. Fill in the blanks with the word that will make the sentence correct

We have 4 phases labeled with images of the uterus at different stages.

#### 1. M______ PHASE
> Bleeding starts as the lining of the U________ breaks down and passes through V________

- M = Menstrual
- U = Uterus
- V = Vagina

✔ Menstrual Phase: Bleeding starts as the lining of the Uterus breaks down and passes through Vagina

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#### 2. F______ PHASE
> E_____ cells start to mature and the lining of the U________ starts to build up again.

- F = Follicular
- E = Egg (or Oocyte)
- U = Uterus

✔ Follicular Phase: Egg cells start to mature and the lining of the Uterus starts to build up again.

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#### 3. O______ PHASE
> An egg is released from the O________

- O = Ovulation
- O = Ovary

✔ Ovulation Phase: An egg is released from the Ovary

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#### 4. L______ PHASE
> The Uterus L________ stays thick waiting for the fertilized E________

- L = Luteal
- L = Lining (endometrium)
- E = Egg

✔ Luteal Phase: The Uterus Lining stays thick waiting for the fertilized Egg

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✔ Final Answers:

#### A. Diagram Shading
- Red: Days 1–5 (Menstruation)
- Pink: Day 14 (Ovulation)
- Violet: Days 6–10 (Thickening starts)
- Green: Day 14 (Ovulation)
- Yellow: Days 21–28 (Lining is thick)

#### B. Flow Chart
```
[Day 1–5] → [Day 6–10] → [Day 11–15] → [Day 16–24] → [Day 24–28]
Menstruation Proliferative Ovulation Secretory Menstruation
```

#### C. Fill in the Blanks
1. MENSTRUAL PHASE: Bleeding starts as the lining of the Uterus breaks down and passes through Vagina
2. FOLLICULAR PHASE: Egg cells start to mature and the lining of the Uterus starts to build up again.
3. OVULATION PHASE: An egg is released from the Ovary
4. LUTEAL PHASE: The Uterus Lining stays thick waiting for the fertilized Egg

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This completes the worksheet accurately and scientifically! Let me know if you'd like a printable version or visual guide.