AP PSYCHOLOGY

Detailed explanation-1: -In the rigid-erection phase, the ischiocavernosus and bulbocavernosus muscles forcefully compress the spongiosum and penile veins, which results in further engorgement and increased pressure in the glans and spongiosum.

Detailed explanation-2: -…the corpora cavernosa and the corpus spongiosum, respectively, become engorged with blood so that the penis enlarges, hardens, and assumes an erect position.

Detailed explanation-3: -Erectile tissue exists in places such as the corpora cavernosa of the penis, and in the clitoris or in the bulbs of vestibule. During erection, the corpora cavernosa will become engorged with arterial blood, a process called tumescence.

Detailed explanation-4: -The shaft of the penis contains three cylindrical masses of spongy tissue filled with blood sinuses (Figure 4.10). Two of these cylinders, one on each side of the top of the shaft, are the corpora cavernosa.