In the male reproductive system of a mammal, sperm is stored in the?

Step 1: Analyze the question The question asks where sperm is stored in the male mammal's reproductive system. The key word is "stored", not "produced" or "transported".

Step 2: Concept review: the path of sperm

1. Seminiferous tubules (in the testes): sperm are produced here by spermatogenesis.
2. Epididymis: a coiled tube on the surface of each testis. Sperm mature and are stored here until ejaculation.
3. Vas deferens (sperm duct): transports sperm from the epididymis towards the urethra. It does not mainly store them.
4. Urethra: a common passage for semen and urine, leaving through the penis.

Step 3: Evaluate the options

• A. Vas deferens: this is a transport tube, so it is not the main storage site.
• B. Urethra: this is the exit passage, not a storage organ.
• C. Epididymis: sperm mature and are stored here. ✔
• D. Seminiferous tubules: this is where sperm are made, not stored.

Step 4: Answer The correct answer is C. epididymis.

Exam tip: Remember the sequence "Seminiferous → Epididymis → Vas deferens → Urethra", or "Make, Keep, Move, Exit":

• Make = seminiferous tubules
• Keep = epididymis
• Move = vas deferens
• Exit = urethra

Note that "van deferens" in the option is a misspelling of "vas deferens". Don't let it confuse you in the exam.