Find the incorrect match.

Options

A. Myometrium : Smooth muscle layer that contracts during parturition
B. Vagina : Lined internally by glands that are shed during menstruation
C. Fundus : common site for implantation
D. Cervix and vagina : Birth canal

Answer

To solve the question of finding the incorrect match, we will analyze each option provided in the question step by step.

### Step 1: Analyze the first option - Myometrium
- The myometrium is the middle layer of the uterus.
- It is composed of smooth muscle and is responsible for contractions during childbirth (parturition).
- This description is accurate.

**Hint:** The myometrium is crucial for childbirth as it contracts to help deliver the baby.

### Step 2: Analyze the second option - Vagina lined internally by glands shed during menstruation
- The vagina is not lined by glands that shed during menstruation.
- The shedding during menstruation refers to the endometrium, the innermost layer of the uterus, not the vagina.
- Therefore, this statement is incorrect.

**Hint:** Remember that the endometrium is the layer that sheds during menstruation, not the vagina.

### Step 3: Analyze the third option - Fundus as the common site for implantation
- The fundus is indeed the upper part of the uterus and is the common site for implantation of the embryo.
- This statement is correct.

**Hint:** Implantation occurs in the endometrial lining, specifically in the fundus area of the uterus.

### Step 4: Analyze the fourth option - Cervix and vagina as the birth canal
- The cervix and vagina together form the birth canal through which the baby is delivered.
- This statement is also correct.

**Hint:** The birth canal consists of both the cervix and vagina, facilitating the delivery process.

### Conclusion
After analyzing all the options, we find that the second option regarding the vagina being lined internally by glands that are shed during menstruation is the incorrect match.

**Final Answer:** The incorrect match is the second option.