High school / pre-med / IB practice on the HPG axis, endocrine feedback, testicular anatomy, and spermatogenesis/meiosis (n, chromatids/DNA molecules, stages, and locations).
Which pairing correctly matches the testis' exocrine and endocrine functions?
Source: entermedschool.org
<!-- Male Reproductive System: Hormones, Anatomy & Spermatogenesis — EnterMedSchool -->
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src="https://entermedschool.org/embed/questions#{"title":"Male Reproductive System: Hormones, Anatomy & Spermatogenesis","questions":[{"prompt":"Which pairing correctly matches the testis' exocrine and endocrine functions?","options":[{"label":"A","body":"Exocrine: testosterone secretion; Endocrine: sperm delivery into ducts","isCorrect":false},{"label":"B","body":"Exocrine: sperm production; Endocrine: testosterone and inhibin secretion","isCorrect":true},{"label":"C","body":"Exocrine: LH secretion; Endocrine: GnRH secretion","isCorrect":false},{"label":"D","body":"Exocrine: semen production; Endocrine: semen storage","isCorrect":false},{"label":"E","body":"Exocrine: sperm motility; Endocrine: sperm capacitation","isCorrect":false}],"explanation":"Exocrine means producing something delivered through ducts: the testes produce sperm that enter the reproductive ducts. Endocrine means hormones released to blood: testes secrete testosterone (Leydig cells) and inhibin (Sertoli cells)."},{"prompt":"Where does spermatogenesis primarily occur?","options":[{"label":"A","body":"Epididymis","isCorrect":false},{"label":"B","body":"Seminiferous tubules","isCorrect":true},{"label":"C","body":"Prostate gland","isCorrect":false},{"label":"D","body":"Seminal vesicles","isCorrect":false},{"label":"E","body":"Vas deferens","isCorrect":false}],"explanation":"Spermatogenesis (production of sperm cells) occurs in the seminiferous tubules of the testes. The epididymis mainly matures and stores sperm."},{"prompt":"Leydig cells are located in the testes and are best described as cells that:","options":[{"label":"A","body":"Line the seminiferous tubules and form the blood-testis barrier","isCorrect":false},{"label":"B","body":"Produce testosterone mainly in response to LH","isCorrect":true},{"label":"C","body":"Store sperm until ejaculation","isCorrect":false},{"label":"D","body":"Secrete fructose-rich fluid into semen","isCorrect":false},{"label":"E","body":"Carry action potentials to muscle fibers","isCorrect":false}],"explanation":"Leydig cells sit in the interstitial space and secrete testosterone when stimulated by LH. Sertoli cells line tubules and support spermatogenesis."},{"prompt":"Which pituitary hormone most directly stimulates Sertoli cells to support spermatogenesis?","options":[{"label":"A","body":"LH","isCorrect":false},{"label":"B","body":"FSH","isCorrect":true},{"label":"C","body":"TSH","isCorrect":false},{"label":"D","body":"ADH","isCorrect":false},{"label":"E","body":"Oxytocin","isCorrect":false}],"explanation":"FSH targets Sertoli cells, increasing support for spermatogenesis (e.g., ABP and inhibin production). LH targets Leydig cells."},{"prompt":"Which mapping of hormone -> target cell -> main product/action is most accurate?","options":[{"label":"A","body":"FSH -> Leydig cell -> testosterone","isCorrect":false},{"label":"B","body":"LH -> Sertoli cell -> inhibin","isCorrect":false},{"label":"C","body":"LH -> Leydig cell -> testosterone; FSH -> Sertoli cell -> support of spermatogenesis (ABP/inhibin)","isCorrect":true},{"label":"D","body":"GnRH -> Leydig cell -> sperm","isCorrect":false},{"label":"E","body":"Testosterone -> pituitary -> GnRH","isCorrect":false}],"explanation":"LH stimulates Leydig cells to produce testosterone. FSH stimulates Sertoli cells to support spermatogenesis and secrete factors like ABP and inhibin."},{"prompt":"Inhibin released from the testes primarily acts on the anterior pituitary to:","options":[{"label":"A","body":"Increase FSH secretion","isCorrect":false},{"label":"B","body":"Decrease FSH secretion","isCorrect":true},{"label":"C","body":"Increase LH secretion","isCorrect":false},{"label":"D","body":"Increase GnRH secretion from the hypothalamus","isCorrect":false},{"label":"E","body":"Convert testosterone into DHT","isCorrect":false}],"explanation":"Inhibin provides negative feedback mainly on FSH secretion from the anterior pituitary."},{"prompt":"A rise in circulating testosterone would most directly tend to:","options":[{"label":"A","body":"Increase GnRH and LH release (positive feedback)","isCorrect":false},{"label":"B","body":"Decrease GnRH and LH release (negative feedback)","isCorrect":true},{"label":"C","body":"Increase FSH by stimulating inhibin","isCorrect":false},{"label":"D","body":"Stop meiosis I from occurring by removing DNA","isCorrect":false},{"label":"E","body":"Increase sperm count instantly within minutes","isCorrect":false}],"explanation":"Testosterone exerts negative feedback on the hypothalamus and pituitary, lowering GnRH and especially LH."},{"prompt":"GnRH is secreted from the hypothalamus and reaches the anterior pituitary mainly through:","options":[{"label":"A","body":"The lymphatic system","isCorrect":false},{"label":"B","body":"The hypothalamic-hypophyseal portal blood system","isCorrect":true},{"label":"C","body":"The spermatic cord","isCorrect":false},{"label":"D","body":"The urethra","isCorrect":false},{"label":"E","body":"Cerebrospinal fluid only","isCorrect":false}],"explanation":"GnRH is released into portal vessels that deliver it directly to the anterior pituitary."},{"prompt":"Why must GnRH be released in pulses (rather than continuously) to maintain normal LH/FSH secretion?","options":[{"label":"A","body":"Continuous GnRH increases receptor sensitivity and boosts LH/FSH","isCorrect":false},{"label":"B","body":"Continuous GnRH causes pituitary GnRH receptors to downregulate, lowering LH/FSH release","isCorrect":true},{"label":"C","body":"Pulses are needed to allow sperm to swim","isCorrect":false},{"label":"D","body":"Pulses prevent testosterone from being made","isCorrect":false},{"label":"E","body":"GnRH is stored only in the testes and released from there","isCorrect":false}],"explanation":"Pulsatile GnRH keeps pituitary receptors responsive. Continuous stimulation causes receptor downregulation and decreased LH/FSH."},{"prompt":"What is the main purpose of androgen-binding protein (ABP) produced by Sertoli cells?","options":[{"label":"A","body":"To break down testosterone into inactive products","isCorrect":false},{"label":"B","body":"To bind testosterone in the seminiferous tubules and maintain a high local concentration for spermatogenesis","isCorrect":true},{"label":"C","body":"To transport sperm from the epididymis to the urethra","isCorrect":false},{"label":"D","body":"To convert GnRH into LH","isCorrect":false},{"label":"E","body":"To provide ATP directly to myosin in muscle","isCorrect":false}],"explanation":"ABP binds and concentrates testosterone in the seminiferous tubules, supporting spermatogenesis."},{"prompt":"The blood-testis barrier is formed primarily by:","options":[{"label":"A","body":"Tight junctions between Sertoli cells","isCorrect":true},{"label":"B","body":"Desmosomes between Leydig cells","isCorrect":false},{"label":"C","body":"Gap junctions between sperm cells","isCorrect":false},{"label":"D","body":"The basement membrane alone","isCorrect":false},{"label":"E","body":"The sperm tail (flagellum)","isCorrect":false}],"explanation":"Sertoli-Sertoli tight junctions create the blood-testis barrier, separating basal and adluminal compartments."},{"prompt":"A key reason the blood-testis barrier is biologically important is that it:","options":[{"label":"A","body":"Prevents oxygen from reaching the testes","isCorrect":false},{"label":"B","body":"Separates developing haploid germ cells from the immune system and helps control the tubule environment","isCorrect":true},{"label":"C","body":"Stops testosterone from entering the seminiferous tubules","isCorrect":false},{"label":"D","body":"Creates the sperm tail from microtubules","isCorrect":false},{"label":"E","body":"Produces fructose for sperm energy","isCorrect":false}],"explanation":"After meiosis, germ cells express new antigens; the barrier reduces immune exposure and maintains a controlled microenvironment."},{"prompt":"Which sequence correctly describes the main stages of sperm development?","options":[{"label":"A","body":"Spermatid -> spermatogonium -> spermatozoon -> primary spermatocyte","isCorrect":false},{"label":"B","body":"Spermatogonium -> primary spermatocyte -> secondary spermatocyte -> spermatid -> spermatozoon","isCorrect":true},{"label":"C","body":"Primary spermatocyte -> spermatogonium -> spermatid -> secondary spermatocyte -> spermatozoon","isCorrect":false},{"label":"D","body":"Spermatozoon -> spermatid -> secondary spermatocyte -> primary spermatocyte -> spermatogonium","isCorrect":false},{"label":"E","body":"Leydig cell -> Sertoli cell -> spermatozoon -> spermatid -> spermatogonium","isCorrect":false}],"explanation":"Development proceeds from spermatogonia to primary spermatocytes, secondary spermatocytes, spermatids, then spermatozoa."},{"prompt":"A human spermatogonium in G1 phase has which combination of chromosome number and DNA molecules?","options":[{"label":"A","body":"23 chromosomes and 23 DNA molecules","isCorrect":false},{"label":"B","body":"46 chromosomes and 46 DNA molecules","isCorrect":true},{"label":"C","body":"46 chromosomes and 92 DNA molecules","isCorrect":false},{"label":"D","body":"23 chromosomes and 46 DNA molecules","isCorrect":false},{"label":"E","body":"92 chromosomes and 92 DNA molecules","isCorrect":false}],"explanation":"In G1, diploid cells have 46 chromosomes, each made of one DNA molecule, so 46 DNA molecules."},{"prompt":"A human primary spermatocyte AFTER S phase (just before meiosis I) has which combination?","options":[{"label":"A","body":"46 chromosomes and 46 DNA molecules","isCorrect":false},{"label":"B","body":"46 chromosomes and 92 DNA molecules","isCorrect":true},{"label":"C","body":"23 chromosomes and 46 DNA molecules","isCorrect":false},{"label":"D","body":"23 chromosomes and 23 DNA molecules","isCorrect":false},{"label":"E","body":"92 chromosomes and 92 DNA molecules","isCorrect":false}],"explanation":"DNA replication doubles DNA molecules but does not change chromosome count. So 46 chromosomes with 92 DNA molecules."},{"prompt":"A human secondary spermatocyte (after meiosis I, before meiosis II) has which combination?","options":[{"label":"A","body":"46 chromosomes and 92 DNA molecules","isCorrect":false},{"label":"B","body":"46 chromosomes and 46 DNA molecules","isCorrect":false},{"label":"C","body":"23 chromosomes and 46 DNA molecules","isCorrect":true},{"label":"D","body":"23 chromosomes and 23 DNA molecules","isCorrect":false},{"label":"E","body":"92 chromosomes and 46 DNA molecules","isCorrect":false}],"explanation":"Meiosis I separates homologous chromosomes, reducing to 23. Each still has two sister chromatids, so 46 DNA molecules."},{"prompt":"A human spermatid (after meiosis II) has which combination?","options":[{"label":"A","body":"46 chromosomes and 46 DNA molecules","isCorrect":false},{"label":"B","body":"46 chromosomes and 92 DNA molecules","isCorrect":false},{"label":"C","body":"23 chromosomes and 46 DNA molecules","isCorrect":false},{"label":"D","body":"23 chromosomes and 23 DNA molecules","isCorrect":true},{"label":"E","body":"92 chromosomes and 92 DNA molecules","isCorrect":false}],"explanation":"Meiosis II separates sister chromatids, so each haploid cell ends with 23 chromosomes and 23 DNA molecules."},{"prompt":"At metaphase I of meiosis in a primary spermatocyte, what is aligned at the metaphase plate?","options":[{"label":"A","body":"Single chromosomes lined up individually (as in mitosis)","isCorrect":false},{"label":"B","body":"Homologous chromosome pairs (bivalents/tetrads)","isCorrect":true},{"label":"C","body":"Only sister chromatids with no homologs present","isCorrect":false},{"label":"D","body":"Only haploid chromosomes","isCorrect":false},{"label":"E","body":"Only sperm tails","isCorrect":false}],"explanation":"In metaphase I, homologous pairs align together. Sister chromatids remain joined."},{"prompt":"Crossing over (exchange of genetic material between homologous chromosomes) occurs primarily during:","options":[{"label":"A","body":"Prophase I","isCorrect":true},{"label":"B","body":"Metaphase II","isCorrect":false},{"label":"C","body":"Anaphase II","isCorrect":false},{"label":"D","body":"Telophase II","isCorrect":false},{"label":"E","body":"G2 phase after meiosis","isCorrect":false}],"explanation":"Crossing over happens in prophase I when homologous chromosomes pair and exchange segments."},{"prompt":"Independent assortment is best explained by which event?","options":[{"label":"A","body":"Random alignment of homologous chromosome pairs at metaphase I","isCorrect":true},{"label":"B","body":"Random separation of sister chromatids at anaphase II only","isCorrect":false},{"label":"C","body":"Random mutation of DNA during fertilization","isCorrect":false},{"label":"D","body":"Random ATP binding to myosin","isCorrect":false},{"label":"E","body":"Random diffusion of sperm in semen","isCorrect":false}],"explanation":"Independent assortment comes from each homologous pair orienting randomly at metaphase I."}]}"
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