Expulsion phase

Definition

The expulsion phase is the final stage of the male ejaculation process, where semen is forcefully expelled from the body through the urethra. This phase is characterized by a series of rhythmic contractions of the pelvic muscles and the internal urethral sphincter, which work together to release sperm and seminal fluid. It marks the culmination of sexual arousal and physiological changes that occur during sexual activity, playing a crucial role in reproduction.

5 Must Know Facts For Your Next Test

1. The expulsion phase occurs after the emission phase, where semen is gathered in the urethra before being expelled.
2. During the expulsion phase, muscle contractions occur at intervals, typically every 0.8 seconds, resulting in a series of pulses that propel semen out of the body.
3. The sensation experienced during the expulsion phase is often described as pleasurable, contributing to the overall experience of orgasm.
4. Neurotransmitters like oxytocin are released during this phase, enhancing feelings of bonding and intimacy between partners.
5. The strength and duration of the expulsion phase can vary among individuals, influencing the volume and intensity of ejaculation.

Review Questions

• What physiological processes occur during the expulsion phase of male ejaculation?
  • During the expulsion phase, a series of rhythmic contractions of the pelvic muscles occur alongside contractions of the internal urethral sphincter. These actions work together to forcefully expel semen through the urethra. The process is highly coordinated and is typically experienced during orgasm, resulting in a pleasurable sensation that signifies the peak of sexual arousal.
• Discuss the significance of the expulsion phase in relation to male reproductive health.
  • The expulsion phase plays a critical role in male reproductive health as it is essential for delivering sperm to the female reproductive tract. The effective expulsion of semen not only aids in fertilization but also reflects overall reproductive function. Any dysfunction in this phase may indicate underlying health issues that could affect fertility or sexual performance.
• Evaluate how factors such as age or health conditions can influence the characteristics of the expulsion phase.
  • As men age or experience certain health conditions like diabetes or hormonal imbalances, changes in the characteristics of the expulsion phase can occur. These factors may lead to altered sensations during ejaculation, decreased semen volume, or even difficulties in achieving orgasm. Understanding these influences is important for addressing potential reproductive health concerns and enhancing overall sexual well-being.

Related terms

Ejaculation: The process by which semen is expelled from the male reproductive tract, typically occurring at the peak of sexual climax.

Semen: A fluid containing sperm and various nutrients that is released during ejaculation, supporting sperm viability and mobility.

Orgasm: A complex physiological and psychological response to sexual stimulation, often associated with intense pleasure and culminating in ejaculation in males.