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BIO202-CH27-Repro1

BIO202 - Ch 27 - Reproductive System -male - Marieb/Hoehn - RioSalado - AZ

QuestionAnswer
Seminiferous tubules Actual "sperm factories" - 250 - 300 lobules in each testis.
Smooth muscle-like cells that squeeze sperm & testicular fluid out through tubules. myloid cells
What do the interstitial cells (Leydig) produce? androgens (testosterone)
The __ absorbs heat from arterial blood, cooling it before it enters testes. Pampiniform plexus - network of veins that surround testicular artery within scrotum.
CT sheath that encloses blood vessels & lymphatic, & nerves for testis. spermatic cord
orchiectomy testis removal
The penis & scrotum are suspended from? the perineum
tip of penis glans penis
prepuce foreskin of penis
Accessory ducts of testes proximal to distal. Epididymis, ductus deferens, ejaculatory, & urethra
Sperm are ejaculated from the __ not testes. epididymis
What contributes the bulk of semen Seminal vesicles, bulbourethral glands, & prostate
What is stored in seminal vesicles? Yellowish viscous alkaline fluid & fructose that enhance sperm motility or fertilizing power - 60% volume of semeninal fluid for sperm.
What role does prostate secretions play? Activates sperm - acidic - enzymes
Prostatitis Inflammation of prostate
Role of bulbourethral glands Produce thick mucus - neutralizes acidic urine in urethra - lubricates glan penis
Prostaglandins in semen affect woman how? Decrease mucus plug of cervix & reverse peristalsis in uterus to facilitate sperm movement through female reproductive tract.
Male orgasm is a __ reflex. spinal
Everyday, a healthy adult male makes apx. __ sperm. 400 million
Normal chromosome number in most body cells is __. 46 - "2n" - diploid chromosomal number.
homologous chromosomes pairs of similar chromosomes - one from each parent.
Number of chromosomes in gametes. 23 - "n" - haploid chromosomal number
Meiosis consists of __ nuclear divisons & product is __ daughter cells with __ as many chromosomes as typical body cells. 2 - 4 - half
Erectile dysfunction results from lack of __. nitric oxide
Synapsis In Prophase of Meiosis I - replicated chromosomes seek out & pair up with their homologous partners - tetrads are formed.
tetrads Little groups of 4 chromatids - in Prophase of Meiosis I.
Chiasmata Crossovers that occur within each tetrad as free ends exchange.
Reduction division of meiosis Meiosis I reduces chromosome number from 2n to n.
What unique even occurs in meiosis that is not in mitosis? Synapsis - tetrads formation of little packets of 4 chromatids
Longest period of meiosis Prophase I - 90% of time
Which phase of meiosis is like mitosis? Phase 2
Equational division of meiosis Meiosis II - because chromatids are distributed equally to daughter cells.
What 2 important tasks does meiosis accomplish? (1) reduces chromosomal number by half & (2) introduces genetic variability.
What increases genetic variability in meiosis? Random alignment of homologous pairs during meiosis I, & cross over during Prophase I.
Type B cell of spermatogonia Becomes primary spermatocyte destined to produce 4 sperm.
Spermatocytes become __. secondary spermatocytes, then spermatids.
Spermiogenesis Spermatids become sperm - tail forms
acrosome lysosome-like sperm helmet used to penetrate egg.
What cell type results from meiosis? spermatids
brain-testicular axis interactions between hypothalamus, anterior pituitary gland, & testes for hormonal regulation.
__ stimulates spermatogenesis. FSH - follicle-stimulating hormone.
__ binds to interstitial cells & causes testosterone secretion. LH - luteinizing hormone
What does inhibin do? hormone that inhibits sperm count.
Testosterone is synthesized from __. cholesterol
Created by: Ladystorm
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