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Humans semen is liquid at ejaculation bu...

Humans semen is liquid at ejaculation but it soon coagulates and then undergo secondary liquefaction under the influence of ..... Secretion released by ..... gland.

A

Fibrinogen, seminal vesicle

B

Uterine milk, mucus

C

Fibrinolysin , prostate gland

D

Alkaline phosphatase , uterus

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to identify the secretion responsible for the secondary liquefaction of human semen and the gland from which it is released. Here’s a step-by-step breakdown of the solution: ### Step 1: Understand the Composition of Semen - Semen is composed of sperm and seminal fluid. The seminal fluid is a mixture of secretions from various glands. **Hint:** Remember that semen is not just sperm; it includes fluids that help nourish and transport sperm. ### Step 2: Identify the Process After Ejaculation - At ejaculation, semen is initially liquid but soon coagulates. This coagulation is due to the presence of clotting proteins. **Hint:** Think about what happens to fluids when they are exposed to air or when they contain certain proteins. ### Step 3: Recognize the Need for Secondary Liquefaction - After coagulation, the semen must undergo secondary liquefaction to allow sperm to swim freely. This process is essential for fertility. **Hint:** Consider why sperm need to move freely after ejaculation for successful fertilization. ### Step 4: Identify the Secretion Responsible for Secondary Liquefaction - The secretion responsible for secondary liquefaction is **fibrinolysin**. This substance helps break down the clot formed after ejaculation. **Hint:** Focus on the term "liquefaction" and think about substances that can dissolve or break down clots. ### Step 5: Determine the Gland That Releases This Secretion - Fibrinolysin is secreted by the **prostate gland**. This gland plays a crucial role in the male reproductive system by contributing to the seminal fluid. **Hint:** Recall the major glands involved in male reproduction and their functions. ### Conclusion The correct answer to the question is that human semen undergoes secondary liquefaction under the influence of **fibrinolysin**, which is released by the **prostate gland**. ### Final Answer **Fibrinolysin and prostate gland.**
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