Question

48 which muscle ejects urine or semen, compresses the base of the penis, and helps in formation of an erection? multiple choice lliococcygeus superficial transverse perineal muscle external urethral sphincter bulbospongiosus pubococcygeus

Explanation:

• Iliococcygeus: Mainly involved in supporting pelvic organs rather than the functions described.
• Superficial transverse perineal muscle: Its role is more related to stabilizing the perineal body.
• External urethral sphincter: Primarily controls the flow of urine, not directly involved in erection formation.
• Bulbospongiosus: This muscle ejects urine or semen, compresses the base of the penis, and helps in the formation of an erection. It contracts to empty the urethra after urination and during ejaculation, and also aids in penile erection by compressing the veins at the base of the penis.
• Pubococcygeus: Part of the pelvic floor muscles with functions like supporting pelvic organs and assisting in sexual function but not specifically matching all the described functions.

Answer:

Bulbospongiosus