Bio 169-exam 5 (Answered) Questions and Correct
Answers With Complete Verified Solution, 2024/2025.
100% Correct.
Why are the testicles located outside of the body?
regulate temperature, 2 degrees cooler than the body.
cremaster muscle
contracts/relaxes to adjust distance of testes from body
dartos muscle
smooth muscle; wrinkles scrotal skin; pulls scrotum close to body
seminiferous tubules
site of sperm production, contains clusters of endocrine cells called interstitial cells or leydig cells.
Leydig cells (interstitial cells)
Secrete testosterone
sustentacular cells
provide nourishment for development of sperm
Spermiogenesis
transformation of spermatids to spermatozoa during spermatogenesis
Spermatogenesis
the production of sperm cells
Anatomy of a sperm
head= almost all nucleus; tail= flagellum, propels sperm; body/neck= contains mitochondria which
provides energy for movement
ejaculatory duct
duct formed by the union of the vas deferens with the duct of the seminal vesicle; its fluid is carried into
the urethra
prostatic urethra
Where the urethra passes through the prostate.
Epididymis
A long, coiled duct on the outside of the testis in which sperm mature.
, spongy urethra
transports both sperm and urine
membranous urethra
portion of the urethra between the prostate and the penis
glans penis
the conical mass of erectile tissue that forms the head of the penis
corpora cavernosa
prepuce
foreskin; loose casing that covers the glans penis; removed by circumcision
corpus spongiosum
the mass of spongy tissue surrounding the male urethra within the penis
bulbourethral glands
A pair of exocrine glands near the male urethra. They secrete fluid into the urethra. Also called Cowper
glands
seminal vesicles
two small glands that secrete a fluid rich in sugar that nourishes and helps sperm move
prostate gland
A gland in males that contributes to the seminal fluid.
luteinizing hormone (LH) job, origin
Gonadotropin-releasing hormone (GnRH)
Promotes secretion of follicle-stimulating hormone (FSH) and luteinizing hormone (LH)
Cause of male onset of puberty
Testosterone
the most important of the male sex hormones. Both males and females have it, but the additional
testosterone in males stimulates the growth of the male sex organs in the fetus and the development of
the male sex characteristics during puberty
Follicle-stimulating hormone (FSH)
secreted by the pituitary gland to stimulate maturation of the egg cell (ovum)
Sequence of blood flow through penis
Function of the uterus
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