Ovaries And Testes

Question 0

What’re the stages of oogenesis that result in 1 egg from (haploid cell) from a primary oocyte (diploid)?

Answer 0

The ovaries contain primary oocytes. The primary oocyte (diploid) is replicated (interphase) this diploid then goes through meiosis 1 to give 2 haploid cells. These haploid cells then go through meiosis 2 to give 4 (2 each) new haploid cells. 3 of these polar bodies are smaller than the 4th daughter cells and will disintegrate. Only one will survive and become the mature ovum.

Question 1

What is oogenesis?

Answer 1

The creation of an ovum (mature egg)

Question 2

Where does oocyte development occur in humans?

Answer 2

The ovaries

Question 3

If more than one follicle matures, what is the result?

Answer 3

Fraternal twins.

Question 4

What is the release of the secondary oocyte from the ovaries called?

Answer 4

Ovulation

Question 5

What is the large tertiary follicle they can be expected to suffice for ovulation called?

Answer 5

The Graafian follicle

Question 6

What are the three stages of the menstrual cycle?

Answer 6

Menstruative phase, proliferative phase and secretory phase.

Question 7

What are the three stages of the ovarian cycle?

Answer 7

Follicular phase, ovulation and luteal phase.

Question 8

What day does bleeding begin?

Answer 8

Day 0.

Question 9

What phase is this: ovarian follicles mature and get ready to release an egg.

Answer 9

Follicular phase

Question 10

What phase is this: mature egg is released from ovarian follicles into oviduct.

Answer 10

Ovulation

Question 11

What phase is this: Corpus luteum atrophies.

Answer 11

Luteal phase

Question 12

What phase of the uterine cycle does the luteal phase correspond to?

Answer 12

Secretory phase

Question 13

What hormones are required by the corpus luteum to maintain itself?

Answer 13

LH and FSH

Question 14

Where is the hormone progesterone produced?

Answer 14

The corpus luteum

Question 15

What do falling levels of progesterone trigger?

Answer 15

Menstruation

Question 16

What phase is this: flow of menses.

Answer 16

Menstruative phase

Question 17

What phase is this: estrogen causes lining of uterus to grow/proliferate.

Answer 17

Proliferative phase

Question 18

What phase is this: corpus luteum produces progesterone which plays role in blastocyst implantation

Answer 18

Secretory phase

Question 19

What is spermatogenesis?

Answer 19

The process by which spermatozoa are produced from the male primordial germ cells by means of mitosis and meiosis.

Question 20

Describe the process from single spermatogonia to 4 mature spermatozoa.

Answer 20

1 spermatogonia yields 1 primary spermatocyte by mitosis. The primary spermatocyte divided meiotically (meiosis 1) to give 2 secondary spermatocytes. Each secondary spermatocyte divides into 2 spermatids by means of meiosis 2. These 4 spermatids mature into spermatozoa, also known as sperm cells.

Question 21

What is the term given to the non cyclic production of sperm?

Answer 21

continual total production

Question 22

What male accessory organ concentrates and stores sperm?

Answer 22

Epididymis

Question 23

What male accessory organ produces semen into the ejaculatory duct?

Answer 23

Seminal vesicles

Question 24

What male accessory organ produces alkaline fluid and clotting enzymes?

Answer 24

Prostate gland

Question 25

What male accessory organ secretes mucus as a lubricant?

Answer 25

Bulbourethral gland

Question 26

What pituitary hormone acts on Leydig cells to regulate testosterone secretion?

Answer 26

LH

Question 27

What pituitary hormone acts on Sertoli cells to enhance spermatogenesis?

Answer 27

FSH

Question 28

What effect does too much testosterone have on spermatogenesis?

Answer 28

It suppresses it