Growing Fetus

Question 1

ovum

Answer 1

ovulation to fertilization

Question 2

zygote

Answer 2

fertilization to implantation

Question 3

embryo

Answer 3

implantation to 5 to 8 weeks

Question 4

fetus

Answer 4

5 to 8 weeks- term

Question 5

conceptus

Answer 5

developing embryo or fetus and placental structures

Question 6

refers to condition of carrying an offspring within the body.

Answer 6

PREGNANCY

Question 7

a form of reproduction that unites the cell of 2 individuals to form a unique new individual who embodies characteristics of both parents

Answer 7

PREGNANCY

Question 8

union of ovum and spermatozoa

Answer 8

FERTILIZATION

Question 9

union generally occurs in the

Answer 9

distal third of the fallopian tube

Question 10

how many days does implantation occur?

Answer 10

7 days or 5 days

Question 11

what happens after fertilization in implantation?

Answer 11

the trophoblast burrows into the endometrium ( upper part of uterus), embedding the fertilized egg into the uterine lining

Question 12

what the endometrium is called after implantation

Answer 12

decidua

Question 13

fertilization is also referred as?

Answer 13

conception and impregnation

Question 14

union of ovum and spermatozoa.

Answer 14

fertilization

Question 15

where does fertilization occur?

Answer 15

Occurs in the outer third of a fallopian tube –– AMPULLAR PORTION

Question 16

how many times does a woman’s ova reach maturity

Answer 16

once a month

Question 17

Once the mature ovum is released, fertilization must? and why?

Answer 17

occur fairly quickly

because an ovum is capable of fertilization for only 24 hours (48 hours at most)

Question 18

after 24 or 48 hours what happens to mature ova?

Answer 18

it atrophies and become

nonfunctional.

Question 19

describe total critical time span during which sexual relations must occur

Answer 19

72 hours (48 hours before ovulation + 24 hours afterward).

Question 20

what happens when the ovum is released from the graafian foliicle of an overy during ovulation?

Answer 20

it is surrounded by:
o Zona Pellucida –– a ring of mucopolysaccharide fluid.
o Corona Radiata –– circle of cells.

Question 21

circle of cells

Answer 21

Corona Radiata

Question 22

Zona Pellucida

Answer 22

a ring of mucopolysaccharide fluid.

Question 23

function of zona pellucida and circle of cells to ovum

Answer 23

increase the bulk of the ovum and serve as protective buffers against injury

Question 24

The ovum and these surrounding cells are propelled into a nearby fallopian tube by currents initiated by the

Answer 24

Fimbriae

Question 25

fine, hairlike structures that line the openings of fallopian tubes.

Answer 25

Fimbriae

Question 26

what helps propel the ovum along the length of the tube

Answer 26

combination of peristaltic action of the tube and movements of the fimbrae

Question 27

where is the ovum and the surrounding cells propelled at?

Answer 27

nearby fallopian tube

Question 28

ejaculation of semen averages

Answer 28

2.5 mL of fluid

Question 29

ejaculated semen per mL contains?

Answer 29

50 to 200 million spermatozoa per milliliter.

Question 30

how many spermatozoa per ejaculation?

Answer 30

400 million sperm per ejaculation.

Question 31

at ovulation what happens to cervical mucous? why?

Answer 31

reduction in the viscosity (thickness) Making it easy for spermatozoa to penetrate it.

Question 32

spermatozoa deposited in the vagina generally reach thecervix

Answer 32

90 seconds

Question 33

spermatozoa deposited in the vagina generally reach

Answer 33

outer end of a fallopian tube within 5 minutes after deposition.

Question 34

mechanism whereby spermatozoa are drawn toward an ovum

Answer 34

species-specific reaction

Question 35

how does Spermatozoa move through the cervix and the body of the uterus and into the fallopian tubes, toward the waiting ovum

Answer 35

combination of movement by their flagella (tails) and uterine contractions.

Question 36

The sperm must undergo 2 processes before fertilization:

Answer 36

① Sperm Capacitation

② Acrosomal Reaction

Question 37

A final process that sperm must undergo to be ready for fertilization.

Answer 37

Sperm Capacitation

Question 38

when does Sperm Capacitation happen?

Answer 38

Happens as the sperm move toward the ovum

Question 39

describe what happens in Sperm Capacitation

Answer 39

changes in the plasma membrane of the sperm head which reveal the sperm-binding receptor sites.

Question 40

what happens in acrosomal reaction? where does it deposit?

why does it do it?

Answer 40

As millions of sperms surrounds the ovum, they deposit minute amounts of hyaluronidase in the corona radiata. Allows the sperm head to penetrate the ovum

Question 41

The acrosomal covering of the head of the sperm contains

Answer 41

hyaluronidase.

Question 42

As soon as the sperm penetrates the zona pellucida, and makes contact with the membrane of the ovum, a cellular change occurs in the ovum that inhibits other sperms to penetrate.

Answer 42

Block to polyspermy.

Question 43

what mediates the block to polyspermy? where is it found?

Answer 43

by the release of

materials from the cortical granules, ORGANELLES, found just beneath the surface.

Question 44

what happens after fertilization occurs?

Answer 44

zygote is created

Question 45

created with a combination of genetic materials which creates a unique individual different from the parents and anyone else.

Answer 45

Zygote