Quiz: Male Reproductive System Functions — 8 questions

1. Regarding penis structure and erection, which statements are correct?

A. The penis contains two dorsal corpora cavernosa and one ventral corpus spongiosum.

B. Penile length increases from about 2½–3 inches to about 4–7 inches during erection.

C. Penile erection helps deposit semen into the female vagina.

D. During stimulation, blood enters penile sinuses while drainage is prevented.

E. The penis contains one dorsal corpus cavernosum and two ventral corpora spongiosa.

Answer: (A), (B), (C), (D)

Explanation

The penis contains two dorsal corpora cavernosa and one ventral corpus spongiosum. During stimulation, blood enters the sinuses while drainage is prevented, producing rigidity; erection also facilitates semen deposition and increases penile length from about 2½–3 inches to about 4–7 inches.

2. What is the primary function of the corpora cavernosa and corpus spongiosum in the penis during an erection?

A. They produce semen and hormones necessary for reproduction.

B. They are blood-filled chambers that fill with blood to cause penile rigidity during sexual stimulation.

C. They are nerve tissues responsible for sensation and arousal.

D. They are muscles that contract to help expel urine and semen.

Answer: (B)

Explanation

The corpora cavernosa and corpus spongiosum are blood-filled structures that become engorged with blood during an erection, causing the penis to stiffen. The other options describe functions not associated with these structures.

3. Concerning the mechanism and anatomical changes of penile erection, select the correct statements:

A. Penile venous drainage is prevented during erection.

B. Penile erection occurs because blood leaves the sinuses more rapidly.

C. The corpus spongiosum is positioned ventrally within the penis.

D. Penile length increases to approximately 4–7 inches during erection.

E. Blood rapidly enters penile sinuses during sexual stimulation.

Answer: (A), (C), (D), (E)

Explanation

Erection is produced by increased blood entry into penile sinuses combined with prevented drainage. The corpus spongiosum is ventral, not dorsal, and the stated length change occurs during erection.

4. During an erection, which structures in the penis are primarily responsible for blood accumulation that causes rigidity?

A. The two dorsal corpora cavernosa and the ventral corpus spongiosum

B. The corpora cavernosa only

C. The corpus spongiosum only

D. The urethra and the glans penis

Answer: (A)

Explanation

The two dorsal corpora cavernosa and the ventral corpus spongiosum are richly supplied with blood vessels and contain blood sinuses that fill during an erection. The urethra and glans are not involved in blood accumulation for erection.

5. The following statements concern male reproductive system facts:

A. The prostate gland contributes more than 50% of total semen volume.

B. The prostate gland contributes 20% of total semen volume.

C. Seminal vesicles provide more than 50% of total semen volume.

D. Fructose provides energy for sperm and can support forensic testing in rape cases.

E. The male reproductive system is located in the pelvic region.

Answer: (B), (C), (D), (E)

Explanation

The male reproductive system is located in the pelvic region. Seminal vesicles contribute more than 50% of semen volume, whereas the prostate contributes 20%; fructose supplies sperm energy and has forensic testing relevance.

6. What is the main purpose of semen in the male reproductive process?

A. To directly fertilize the ovum upon ejaculation

B. To carry oxygen to sperm cells and facilitate their movement

C. To serve as a lubricant during sexual intercourse

D. To provide nutrients to sperm, neutralize vaginal acidity, and induce female reproductive contractions

Answer: (D)

Explanation

Semen's primary roles include nourishing sperm, neutralizing the acidic environment of the vagina, and stimulating contractions in the female reproductive tract to aid sperm movement. The other options do not accurately describe semen's functions, as it does not carry oxygen, act solely as a lubricant, or directly fertilize the ovum.

7. Which statements accurately describe components and functions of the male reproductive system?

A. Prostaglandins stimulate vaginal contractions aiding sperm movement upward.

B. Fructose provides energy for sperm cells.

C. Seminal vesicles contribute more than 50% of semen volume.

D. The male reproductive system is located in the pelvic region.

E. The prostate gland contributes 20% of total semen volume.

Answer: (A), (B), (C), (D), (E)

Explanation

Fructose provides energy for sperm, whereas prostaglandins stimulate vaginal contractions that assist sperm movement toward the ovum. The reproductive system is located in the pelvic region, and seminal vesicles contribute more than half of semen volume while the prostate contributes 20%.

8. When does semen typically liquefy after ejaculation?

A. About 20 minutes after ejaculation

B. Within 5 minutes of ejaculation

C. Immediately upon ejaculation

D. Approximately 1 hour after ejaculation

Answer: (A)

Explanation

Semen liquefies after about 20 minutes due to the action of plasmin dissolving the fibrinogen-induced clot. The other options are either too short or too long based on the typical liquefaction time.