Spermatogenesis & Oogenesis

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

during spermatogenesis how many gametes are produced

4 sperm

what is the role of LH in the female

A surge in LH causes ovulation and the secondary oocyte is released into a fallopian tube.

when does capacitation occur

Capacitation involves removal of steroid (e.g. cholesterol) and seminal glycoproteins from the head of the sperm by the vaginal fluid. This exposes the acrosomal head of the sperm and allows greater binding between sperm and oocyte

role of estrogen

Estrogens are responsible for the development and maintenance of the female secondary sex characteristics

what is the role of FSH in female

FSH is secreted from Day 0 through 14 of the reproductive cycle and causes the primary oocyte (primary follicle) to mature and develop into secondary oocyte (secondary follicle).

What happens to the primary oocyte during puberty

FSH stimulaes about a dozen of primary oocytes to resume meiosis I. Only one egg will proceed and halt at metaphase of meiosis II, where it is now a secondary oocyte

what is considered a follicle

Follicle = egg + epithelial cells (granulosa cells) that surround the egg

what happens to the corpus luteum if there is no implantation/fertilization

If implantation does not occur by Day 24, the corpus luteum degenerates (becoming the corpus albicans), and levels of progesterone (and estrogen) decline dramatically.

role of progesterone

Progesterone prepares the endometrium of the uterus for preganacy.

what is the role of seminiferous tubules

Seminiferous tubules are tightly packed tubules located within lobules of the testes. The seminiferous tubules are the functional units of the testis, where spermatogenesis takes place

what is spermiogenesis

Spermiogenesis involves major changes in a spermatid's internal and external structures. head body flagellum

what secretes estrogen in the female

The developing follicle secretes estrogen (granulosa cells)

what happens to the follicle left in the ovary after ovulation of the ovum

The follicle that is left in the ovaries after ovulation becomes the corpus luteum, which secretes progesterone

what is the role of leydig cells

They are responsible for secreting the male sex hormones (testosterone).

when does meiosis II resume in the female

after fertilization occurs, then it produces the second polar body

why are polar bodies produces

all of the cytoplasm goes to one ovum to ensure that at least on egg will have enough cytoplasm to support the zygote until the placenta has formed after fertilization

what is the follicular phase of the ovarian cycle

day 1 -14

what is the luteal phase of the ovarian cycle

day 14-28

what happens to the secondary oocyte

during LH surge, the secondary oocyte is ovulated from the ovary into the uterus. It will remain arrested in metaphase II until fertilization

what are polar bodies

during meiosis in female there is unequal cytokinesis where at the end of Meiosis I, one ovum gets all the cytoplasm and sheds one polar body. At the end of Meiosis II, one ovum gets all the cytoplasm and sheds the second polar body.

what are the layers to the uterus

endometrium - inner most layer myometrium - muscular layer perimetrium - visceral covering

what is the function of epididymis

epididymis is the primary site of storage of sperm cells i.e. as spermatozoa are transported into the epididymis, they are stored there.

when is estrogen levels high in the blood during menstration

estrogen secretion increases beginning with day 0 of the reproductive cycle until day 14. During this period the level of estrogen in blood is high

when estrogren levels decrease, what happens to progestrone levels

estrogren is high day 1-14. progestrone levels are high day 14-24 so the corpus lueteum to prepare body for pregnancy

what are the phases of the menstral cycle

menstral phase (days 1 - 5) proliferation phase (days 6 - 14) secretory phase (days 15 - 28)

what is the overall sequence of speramtogenesis

mitosis meiosis spermiogenesis

are the spermatozoa that are in the epididymis mature?

not they are immature and immobile

when does sperm become mobile and mature

once they undergo capacitation

What happens to the primary oocyte from birth to until puberty

primary oocytes undergo meiosis and soon halts at prophase I until puberty

what stage of spermatogenesis undergoes meiosis

primary spermatocyte (meiosis I) secondary spermatocyte (meiosis II)

what is a primordial follicle

primordial follicles contains a primary oocyte with a single layer of epitheilal cells.

what stage of meiosis is the female egg arrested in

prophase II

what are the layers of the scrotum/testes starting with superficial to deep

skin scrotal fascia cremaster muscle tunica vaginalis tunica albuginea testes

what stage of spermatogenesis undergoes spermiogenesis

spermatid

what is the sequence of spermatogenesis

spermatogonia primary spermatocyte secondary spermatocyte spermatid spermatozoa

what stage of spermatogenesis undergoes mitosis

spermatogonia divides into two daughter cells

what is the role of FSH in male

stimulates sertoli cells in the testes and initiates spermatogenesis in the germinal epithelium of seminiferous tubules

what is the role of LH in male

stimulates the Leydig cells to produce male sex hormones (testosterone).

What is the role of sertoli cells

support and nourish the spermatogenic cells, secrete androgen-binding protein, secrete inhibin, maintain the blood-testis barrier.

in oogenesis how many gametes are produces

1 ovum with 2 polar bodies


Kaugnay na mga set ng pag-aaral

Spanish 1 Practice of -ar Verb Conjugation

View Set

medialab recall -- questions you've missed

View Set

Chapter 16, Chapter 15, Chapter 14

View Set

Medsurge quiz 3 Lower GI (ch 42)

View Set

Unit 3 AP Government Test Beerman 2021

View Set

Ponto de Encontro: Lição 3 - Horas de lazer

View Set