Bio FInal Fertilization, Pregnancy, Labor and Development

1. Douching after intercourse

false

1. Pulling out before ejaculation

false

Having intercourse at the right time of the month for the female

true

Rubbing penis and vulva against each other (no insertion of penis in vagina at all)

false

1. The “morning after pill” (also known as Plan B/emergency contraception) will always work to -prevent a pregnancy.

false

1. A woman cannot get pregnant during menstruation.

false

1. If you are bleeding, it means you definitely are NOT pregnant.

false

You can predict exactly when you are or will ovulate.

false

The pill is effective with all other medications.

false

this pill can prevent STIs

false

when does fertilization occur

egg and culei fuse in fallopian tube

number of chromosomes involved in fertilization

46 chromosomes, 23 from each parent

type of cell fertilized during fertilization

sperm cell

where and when does pregnancy begin

Pregnancy begins in the uterus after a fertilized egg implants into the uterine lining.

symptoms of pregnancy

missed periods, tender swollen nipples, fatigue, slight bleeding or cramping, nausea, cravins, dizziness, faitness, increased urination, headaches, constipation, mood swings

zygote

1 cell (sperm and egg nuclei fuse)

morula

mulberry, many cells in a filled ball

blastocyt

cells on outside, fluid on inside, even more cells, still same size as original zygote

gastrula

invagination occurs, germ layers which give rise to different organ systems form

neurla

notochord and neural tube begin to form

embryo

developing stage after the zygote, where cell differentiation and organ formation take place

fetus

stage of development after the embryo, characterized by continued growth and maturation of organs and systems

when brith occurs

during expulsion stage

define birth

The process of delivering a baby from the uterus, typically involving labor and expulsion stages.

stages of labor

Dilation, expulsion, placental

major events of stages of labor

dilation, delivery, delivery of placenta

twins- how they occur

morula stage

twins chances of getting them

1/90

twins- to types

identical(monozygotic)-1/3 and Dizygotic(fraternal twins)- 1/3

twins-how similar is their DNA, how similar is their appearances

no more alike than other siblings they share about 50% of their DNA, similar to average siblings. while identical is 100%

Characteristics at each week for embryo

1. –  ovulation, fertilization (day 1 in fallopian tube), cleavage, morula, implantation of blastocyst begins (day 6 in uterus)

2. –  implantation continues (completed day 8), pre-embryo has 2 germ layers

3. embryo consist of 3 germ layers

4. embryo has body from established various organ systems laid down

3 main characteristics of fetal development

germinal, embryonic, and fetal stage

weeks of embryonic period

weeks 1 to 8,

weeks of fetal period

implantation to week 8