★ Must-know
The penis contains two dorsal corpora cavernosa and one ventral corpus spongiosum, which are richly supplied with blood vessels and contain blood sinuses.
During sexual stimulation, blood rapidly enters the penile blood sinuses while drainage is prevented, causing the penis to become stiff and rigid.
Further detail
Penile erection helps deposit semen into the female vagina.
The penis increases in length from about 2½ to 3 inches to about 4 to 7 inches during erection.
Sexual stimulation → blood enters sinuses → drainage is prevented → erection
★ Must-know
The male reproductive system is located in the pelvic region.
More than 50% of the total volume of human semen comes from the seminal vesicles, while 20% comes from the prostate gland.
Further detail
Fructose provides energy for sperm and also provides a forensic test in rape cases.
Prostaglandins stimulate vaginal contractions that help sperm move upward through the female genital tract toward the ovum.
1. Regarding penis structure and erection, which statements are correct?
2. Concerning the mechanism and anatomical changes of penile erection, select the correct statements:
3. The following statements concern male reproductive system facts:
Which structures does the penis contain related to blood sinuses?
Two dorsal corpora cavernosa and one ventral corpus spongiosum.
What happens to blood flow during penile erection?
Blood rapidly enters penile sinuses while drainage is prevented, causing rigidity.
Where is the male reproductive system located?
In the pelvic region.
What do prostaglandins do in the female genital tract?
They stimulate vaginal contractions that help sperm move toward the ovum.
Penis structures
Corpora cavernosa and spongiosum contain blood sinuses.
Erection process
Blood enters sinuses; drainage blocked.
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