Transport of Sperm and Erection
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Questions and Answers

What is the first step in the transport of sperm in males?

  • Flaccidity
  • Ejaculation
  • Fertilization
  • Erection (correct)

    • What occurs during the phase of erection in males?

  • The reproductive tract is relaxed
  • The penis loses blood
  • Sperm is expelled
  • The penis fills with blood (correct)

    • What is ejaculation specifically referring to?

  • The process of sperm fertilizing an egg
  • The expulsion of sperm from the reproductive tract (correct)
  • The state of the penis when not erect
  • The filling of the penis with blood

    • How is a sagittal view of the male reproductive system obtained?

    <p>By cutting down the midline</p> Signup and view all the answers

    What is the key physiological change in the penis during erection?

    <p>Increase in blood flow</p> Signup and view all the answers

    Which of the following best describes the state of flaccidity?

    <p>The penis is flaccid and lacks blood</p> Signup and view all the answers

    What does the successful transport of sperm into the female reproductive tract lead to?

    <p>Fertilization of an egg</p> Signup and view all the answers

    Which change primarily triggers the process of erection?

    <p>Increase in blood volume in the penis</p> Signup and view all the answers

    What neurotransmitter is released by the sympathetic nervous system during the process of ejaculation?

    <p>Norepinephrine</p> Signup and view all the answers

    Which muscle contracts to expel semen from the urethra?

    <p>Bulbospongiosum muscle</p> Signup and view all the answers

    What physiological changes may occur in the body after ejaculation?

    <p>Decrease in heart rate and blood pressure</p> Signup and view all the answers

    What is the term used to describe the combination of ejaculation and physiological changes experienced in the body?

    <p>Orgasm</p> Signup and view all the answers

    During sexual excitement, what occurs to the vascular chambers in the penis?

    <p>They fill with blood</p> Signup and view all the answers

    Which structures are contracted in response to norepinephrine during ejaculation?

    <p>All of the above</p> Signup and view all the answers

    What is the primary role of the sympathetic nervous system during ejaculation?

    <p>To stimulate muscular contractions for semen emission</p> Signup and view all the answers

    Where does the semen accumulate before being expelled during ejaculation?

    <p>At the beginning part of the urethra</p> Signup and view all the answers

    What initiates the process of achieving an erection?

    <p>Signals from the brain</p> Signup and view all the answers

    Which part of the penis fills with blood during an erection?

    <p>Corpora cavernosae</p> Signup and view all the answers

    What is the function of the lacunar spaces in the penis?

    <p>To facilitate blood leakage during an erection</p> Signup and view all the answers

    What maintains the balance of blood flow into and out of the penis under normal conditions?

    <p>Equal blood flow through dorsal and cavernous arteries</p> Signup and view all the answers

    Which structure runs the entire length of the vascular chambers in the penis?

    <p>Lacunar spaces</p> Signup and view all the answers

    How can a flaccid penis be visually identified in a transverse view?

    <p>By the noticeable blue veins</p> Signup and view all the answers

    What is the primary role of dorsal veins during an erection?

    <p>To drain excess blood from the penis</p> Signup and view all the answers

    What happens to blood vessels in the penis during erection?

    <p>They open to allow more blood in</p> Signup and view all the answers

    Which artery is responsible for supplying blood during an erection?

    <p>Cavernous artery</p> Signup and view all the answers

    What is the primary reason for the difference in appearance between a flaccid and an erect penis?

    <p>Engorgement of vascular chambers</p> Signup and view all the answers

    What causes the arterials to remain constricted when the penis is flaccid?

    <p>Norepinephrine release from the brain</p> Signup and view all the answers

    Which chemical signal is responsible for the dilation of arterials during erection?

    <p>Nitric oxide</p> Signup and view all the answers

    What role does the tunica albuginea play during an erection?

    <p>It supports the vascular chambers and prevents over-expansion</p> Signup and view all the answers

    What initiates the process of ejaculation in terms of nervous system signaling?

    <p>Chemical signals sent to the spinal cord and brain</p> Signup and view all the answers

    How much semen is typically discharged during ejaculation?

    <p>3 to 5 milliliters</p> Signup and view all the answers

    During which phase of sexual response does the penis become erect?

    <p>Arousal phase</p> Signup and view all the answers

    What happens to blood flow when the penis transitions from erect to flaccid?

    <p>Blood flow is restricted and allowed to exit</p> Signup and view all the answers

    What triggers the release of nitric oxide during the erect state?

    <p>Signals from the parasympathetic nervous system</p> Signup and view all the answers

    Which of the following is NOT a phase of ejaculation?

    <p>Eruption phase</p> Signup and view all the answers

    What is the main reason the penis remains flaccid?

    <p>Constricted arteries due to norepinephrine</p> Signup and view all the answers

    Study Notes

    Transport of Sperm

    • Sperm transport involves moving sperm from the male reproductive tract to the female reproductive tract for fertilization.
    • The process is a two-step mechanism: erection followed by ejaculation.

    Erection

    • Begins in the brain, where sexual stimulation (visual, auditory, or tactile) triggers signals.
    • Blood vessels in the penis expand, allowing blood flow and resulting in an erection.
    • Erection transforms the penis from flaccid (little blood) to engorged (filled with blood).

    Anatomy of the Penis

    • Penis consists of three main parts: base (root), body, and glans (head).
    • Transverse view reveals two corpora cavernosae on each side and one corpus spongiosum below.
    • The urethra runs through the penis, carrying urine and semen.

    Vascular Mechanics

    • Blood enters the vascular chambers via dorsal and cavernosal arteries.
    • During erection, blood leaks from cavernosal arteries into lacunar spaces, causing engorgement and compression of venous drainage.
    • Arterials relax due to the release of nitric oxide (NO) from parasympathetic neurons, facilitating increased blood inflow.
    • Tunica albuginea encases vascular chambers, preventing over-expansion.

    Ejaculation

    • Defined as the release of semen, typically 3-5 milliliters containing approximately 300 million sperm.
    • A critical level of sexual excitement initiates the ejaculation process, sending signals between the penis, spinal cord, and brain.

    Phases of Ejaculation

    • The first phase involves sympathetic nervous system activation: norepinephrine released causes contraction of structures (epididymis, vas deferens, accessory glands, and ejaculatory duct) to push semen into the urethra.
    • In the second phase, rhythmic contractions of the smooth muscle in the urethra and bulbospongiosum muscle expel semen through the meatus.
    • Ejaculation is often accompanied by a sense of pleasure and physiological changes in the body, including decreased heart rate and blood pressure.

    Orgasm

    • The combined sensations from ejaculation and bodily changes can be referred to as an orgasm, representing a peak experience during sexual activity.

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    Description

    Explore the fascinating processes of sperm transport and erection in human physiology. This quiz covers how sperm moves within the reproductive tract and the physiological changes that occur during sexual arousal. Test your knowledge on this essential aspect of human reproduction.

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