Pre-med/IB-style questions on semen composition, accessory gland contributions (seminal vesicles, prostate, bulbourethral glands), sperm production vs maturation (seminiferous tubules vs epididymis), and key physiology concepts such as pH, coagulation/liquefaction, capacitation, and ejaculation control.
Which statement BEST distinguishes semen from spermatozoa?
Source: entermedschool.org
<!-- Semen Production & Sperm Maturation — EnterMedSchool -->
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src="https://entermedschool.org/embed/questions#{"title":"Semen Production & Sperm Maturation","questions":[{"prompt":"Which statement BEST distinguishes semen from spermatozoa?","options":[{"label":"A","body":"Semen is produced only in the seminiferous tubules of the testes.","isCorrect":false},{"label":"B","body":"Spermatozoa are the fluid portion of the ejaculate; semen is the male gamete.","isCorrect":false},{"label":"C","body":"Semen is a mixture of spermatozoa plus secretions from accessory glands; spermatozoa are the male gamete cells.","isCorrect":true},{"label":"D","body":"Semen is a haploid cell that carries paternal DNA.","isCorrect":false},{"label":"E","body":"Spermatozoa are produced mainly by the prostate gland.","isCorrect":false}],"explanation":"Semen is the ejaculatory fluid (mainly from accessory glands) that contains sperm cells. Spermatozoa are the male gametes made in the testes; the prostate and other glands add fluid but do not make sperm."},{"prompt":"In a typical ejaculate, which structure contributes the LARGEST share of the semen fluid volume?","options":[{"label":"A","body":"Seminal vesicles","isCorrect":true},{"label":"B","body":"Prostate gland","isCorrect":false},{"label":"C","body":"Bulbourethral (Cowper’s) glands","isCorrect":false},{"label":"D","body":"Epididymis","isCorrect":false},{"label":"E","body":"Seminiferous tubules","isCorrect":false}],"explanation":"The seminal vesicles contribute the majority of semen volume in most males. The prostate contributes a substantial but smaller portion, and bulbourethral glands contribute only a small lubricating/neutralizing secretion."},{"prompt":"Fructose in semen is important because it can be used as an energy source by sperm. Which gland secretes most of this fructose?","options":[{"label":"A","body":"Prostate gland","isCorrect":false},{"label":"B","body":"Seminal vesicles","isCorrect":true},{"label":"C","body":"Bulbourethral glands","isCorrect":false},{"label":"D","body":"Testes (Leydig cells)","isCorrect":false},{"label":"E","body":"Epididymis","isCorrect":false}],"explanation":"Seminal vesicles secrete a fructose-rich fluid that helps fuel sperm metabolism. The prostate contributes enzymes and other components, while bulbourethral glands mainly produce mucus for lubrication and urethral neutralization."},{"prompt":"Semen contains prostaglandins that can influence the female reproductive tract. They are produced mainly by the:","options":[{"label":"A","body":"Seminal vesicles","isCorrect":true},{"label":"B","body":"Epididymis","isCorrect":false},{"label":"C","body":"Seminiferous tubules","isCorrect":false},{"label":"D","body":"Bulbourethral glands","isCorrect":false},{"label":"E","body":"Scrotal skin (dartos muscle)","isCorrect":false}],"explanation":"Seminal vesicles are a major source of prostaglandins in semen. Epididymis and seminiferous tubules are involved in sperm maturation/production rather than producing most semen prostaglandins."},{"prompt":"A fresh semen sample often coagulates soon after ejaculation and then becomes more liquid again. Which secretion is MOST directly responsible for the later liquefaction?","options":[{"label":"A","body":"Fructose from seminal vesicles","isCorrect":false},{"label":"B","body":"Proteolytic enzymes (e.g., PSA) from the prostate","isCorrect":true},{"label":"C","body":"Mucus from bulbourethral glands","isCorrect":false},{"label":"D","body":"Testosterone from Leydig cells","isCorrect":false},{"label":"E","body":"Inhibin from Sertoli cells","isCorrect":false}],"explanation":"Liquefaction is driven by proteolytic enzymes from the prostate that break down the initial semen gel. Seminal vesicles contribute many of the gel-forming proteins, while bulbourethral mucus is mainly lubricating."},{"prompt":"Which source provides most of the proteins that cause semen to form an initial gel (coagulate) after ejaculation?","options":[{"label":"A","body":"Seminal vesicles","isCorrect":true},{"label":"B","body":"Prostate gland","isCorrect":false},{"label":"C","body":"Bulbourethral glands","isCorrect":false},{"label":"D","body":"Epididymis","isCorrect":false},{"label":"E","body":"Aortic arch baroreceptors","isCorrect":false}],"explanation":"Seminal vesicles provide major gel-forming proteins that make semen coagulate soon after ejaculation. The prostate then contributes enzymes that help liquefy the semen later."},{"prompt":"A small amount of clear fluid released before ejaculation can lubricate the urethra and help neutralize residual acidity. This pre-ejaculate is produced mainly by the:","options":[{"label":"A","body":"Seminal vesicles","isCorrect":false},{"label":"B","body":"Prostate gland","isCorrect":false},{"label":"C","body":"Bulbourethral (Cowper’s) glands","isCorrect":true},{"label":"D","body":"Testes","isCorrect":false},{"label":"E","body":"Epididymis","isCorrect":false}],"explanation":"Bulbourethral glands secrete a mucus-like fluid that lubricates and helps neutralize the urethra. Seminal vesicles and the prostate contribute the bulk of semen volume during ejaculation."},{"prompt":"Spermatozoa are produced (spermatogenesis occurs) primarily in the:","options":[{"label":"A","body":"Epididymis","isCorrect":false},{"label":"B","body":"Seminal vesicles","isCorrect":false},{"label":"C","body":"Seminiferous tubules of the testes","isCorrect":true},{"label":"D","body":"Prostate gland","isCorrect":false},{"label":"E","body":"Urethra","isCorrect":false}],"explanation":"Spermatogenesis occurs in the seminiferous tubules of the testes. The epididymis mainly matures and stores sperm; accessory glands add fluid to semen but do not produce sperm cells."},{"prompt":"Most sperm maturation (including gaining motility and being stored) occurs in the:","options":[{"label":"A","body":"Seminiferous tubules","isCorrect":false},{"label":"B","body":"Epididymis","isCorrect":true},{"label":"C","body":"Seminal vesicles","isCorrect":false},{"label":"D","body":"Prostate gland","isCorrect":false},{"label":"E","body":"Urinary bladder","isCorrect":false}],"explanation":"Sperm become motile and are stored mainly in the epididymis. They are produced in the seminiferous tubules, and later they still require capacitation in the female tract to achieve full fertilizing capability."},{"prompt":"Which statement about sperm leaving the testes (entering the epididymis) is MOST accurate?","options":[{"label":"A","body":"They are already fully motile and ready to fertilize an egg immediately.","isCorrect":false},{"label":"B","body":"They are diploid cells that will become haploid in the epididymis.","isCorrect":false},{"label":"C","body":"They are generally non-motile and not yet fully capable of fertilization.","isCorrect":true},{"label":"D","body":"They are produced by the prostate and stored in the testes.","isCorrect":false},{"label":"E","body":"They contain no mitochondria until capacitation occurs.","isCorrect":false}],"explanation":"Sperm entering the epididymis are typically not yet motile and not fully competent to fertilize. They gain motility and functional maturity in the epididymis, and later undergo capacitation in the female tract."},{"prompt":"Which change is a key hallmark of sperm maturation in the epididymis?","options":[{"label":"A","body":"Sperm undergo meiosis I and II to become haploid.","isCorrect":false},{"label":"B","body":"Sperm acquire progressive motility and undergo surface membrane changes that support later fertilization.","isCorrect":true},{"label":"C","body":"Sperm synthesize large amounts of semen fructose for their own energy storage.","isCorrect":false},{"label":"D","body":"Sperm develop their acrosome for the first time by budding from the plasma membrane.","isCorrect":false},{"label":"E","body":"Sperm replicate their nuclear DNA to prepare for embryonic development.","isCorrect":false}],"explanation":"The epididymis is where sperm gain motility and important surface modifications. Meiosis and acrosome formation occur earlier during spermatogenesis/spermiogenesis in the seminiferous tubules, and sperm do not replicate DNA after becoming haploid."},{"prompt":"Capacitation is a process that increases a sperm’s ability to fertilize an egg. It occurs mainly in the:","options":[{"label":"A","body":"Seminiferous tubules","isCorrect":false},{"label":"B","body":"Epididymis","isCorrect":false},{"label":"C","body":"Female reproductive tract after ejaculation","isCorrect":true},{"label":"D","body":"Seminal vesicles before ejaculation","isCorrect":false},{"label":"E","body":"Prostate gland during semen production","isCorrect":false}],"explanation":"Capacitation occurs after ejaculation in the female reproductive tract and prepares sperm for successful interaction with the egg (including the ability to undergo the acrosome reaction). The epididymis matures sperm but does not complete capacitation."},{"prompt":"A sperm must release enzymes to penetrate the egg’s outer protective layers (especially the zona pellucida). Which event provides this enzyme release?","options":[{"label":"A","body":"Capacitation","isCorrect":false},{"label":"B","body":"Acrosome reaction","isCorrect":true},{"label":"C","body":"DNA replication","isCorrect":false},{"label":"D","body":"Translation of hemoglobin","isCorrect":false},{"label":"E","body":"Synaptic transmission","isCorrect":false}],"explanation":"The acrosome reaction releases enzymes from the acrosome that help the sperm penetrate the zona pellucida. Capacitation prepares the sperm to undergo this reaction but is not the enzyme-release event itself."},{"prompt":"During spermiogenesis, the acrosome forms primarily from the:","options":[{"label":"A","body":"Golgi apparatus","isCorrect":true},{"label":"B","body":"Mitochondria","isCorrect":false},{"label":"C","body":"Ribosomes","isCorrect":false},{"label":"D","body":"Centrioles only, without any membrane contribution","isCorrect":false},{"label":"E","body":"Nuclear envelope","isCorrect":false}],"explanation":"The acrosome is a cap-like structure derived largely from the Golgi apparatus in developing spermatids. It stores enzymes needed for the acrosome reaction during fertilization."},{"prompt":"Which part of a sperm cell contains a high concentration of mitochondria that help supply ATP for movement?","options":[{"label":"A","body":"Acrosome","isCorrect":false},{"label":"B","body":"Nucleus in the head","isCorrect":false},{"label":"C","body":"Midpiece","isCorrect":true},{"label":"D","body":"Tail tip only","isCorrect":false},{"label":"E","body":"Zona pellucida","isCorrect":false}],"explanation":"The midpiece contains many mitochondria that support ATP production needed for flagellar movement. The acrosome contains enzymes, and the nucleus contains DNA; the zona pellucida is part of the egg, not the sperm."},{"prompt":"The basic structural arrangement that allows a sperm flagellum to beat is the axoneme, which typically has a:","options":[{"label":"A","body":"1+1 arrangement of microtubules","isCorrect":false},{"label":"B","body":"3+3 arrangement of microtubules","isCorrect":false},{"label":"C","body":"9+2 arrangement of microtubules","isCorrect":true},{"label":"D","body":"Random arrangement of actin filaments only","isCorrect":false},{"label":"E","body":"Double-membrane arrangement like mitochondria","isCorrect":false}],"explanation":"Most motile cilia and flagella (including sperm tails) have a 9+2 microtubule arrangement. Motor proteins use ATP to generate bending; it is not an actin-only structure."},{"prompt":"Why is the blood–testis barrier important for normal spermatogenesis?","options":[{"label":"A","body":"It prevents oxygen from reaching developing sperm, forcing anaerobic metabolism.","isCorrect":false},{"label":"B","body":"It isolates developing germ cells from immune surveillance and helps maintain a controlled microenvironment.","isCorrect":true},{"label":"C","body":"It allows sperm to enter the bloodstream to reach the prostate.","isCorrect":false},{"label":"D","body":"It increases urine acidity to activate sperm enzymes.","isCorrect":false},{"label":"E","body":"It is mainly needed to pump testosterone into the brain.","isCorrect":false}],"explanation":"Developing sperm express proteins that can appear “new” to the immune system, and the barrier helps protect them while also controlling the fluid environment around them. It does not move sperm into blood or regulate urine acidity."},{"prompt":"The blood–testis barrier is formed mainly by:","options":[{"label":"A","body":"Tight junctions between Sertoli cells","isCorrect":true},{"label":"B","body":"Gap junctions between Leydig cells","isCorrect":false},{"label":"C","body":"Desmosomes between sperm heads","isCorrect":false},{"label":"D","body":"Myelin sheaths around seminiferous tubules","isCorrect":false},{"label":"E","body":"Chloroplast membranes","isCorrect":false}],"explanation":"Tight junctions between Sertoli cells create the blood–testis barrier. Leydig cells produce testosterone in the interstitial space but do not form the main barrier structure."},{"prompt":"Spermatogenesis requires a high local concentration of testosterone within the seminiferous tubules. Which Sertoli-cell product helps achieve this?","options":[{"label":"A","body":"Erythropoietin","isCorrect":false},{"label":"B","body":"Androgen-binding protein (ABP)","isCorrect":true},{"label":"C","body":"Renin","isCorrect":false},{"label":"D","body":"Surfactant","isCorrect":false},{"label":"E","body":"Pepsin","isCorrect":false}],"explanation":"Sertoli cells secrete androgen-binding protein (ABP), which binds testosterone and helps keep its concentration high near developing sperm. The other options are unrelated to concentrating testosterone in the testes."},{"prompt":"Which hormone most directly stimulates Leydig cells to produce testosterone?","options":[{"label":"A","body":"FSH","isCorrect":false},{"label":"B","body":"LH","isCorrect":true},{"label":"C","body":"ADH","isCorrect":false},{"label":"D","body":"TSH","isCorrect":false},{"label":"E","body":"Insulin","isCorrect":false}],"explanation":"LH stimulates Leydig cells to synthesize testosterone. FSH primarily acts on Sertoli cells to support spermatogenesis, while ADH/TSH/insulin have other main roles."}]}"
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