8. Human & Growth & Development Chp 23 Flashcards Preview

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Flashcards in 8. Human & Growth & Development Chp 23 Deck (31):
1

Growth

increase in size

2

development

process of change from one life phase to another. includes prenatal and postnatal

3

Oocyte life

last 24 hours

4

Sperm life

last 72 hours

5

pregnancy

intercourse should (or not) be within 722 hours pre or 24 hours post ovulation

6

fertilization

sperm reaching the secondary oocyte invade the follicular cells and bind to the zona pellucida. the first sperm head to enter the egg cell triggers lysosome-like vesicles just beneath the egg cell's membrane to release enzymes that harden in the z.p

7

Prenatal period (38 weeks)

zygote into smaller cells (blastomeres) as it moves to the uterus (3 days). by then its a solid morula which hollows out (blastocyst) and attaches by day 7. the inner portion becomes the embryo proper, outer wall makes up the tropoblast

8

Placenta Hormones

hCG Progesterone Estrogen Relaxin Lactogen

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hCG

Prevents spontaneous abortions, maintains corpus luteum

10

Progesterone and estrogen

promotes development of uterine wall

11

Relaxin

(corpus luteum) relaxes smooth muscle and ligaments

12

Lactogen

(placenta) stimulates breast development, gets you ready for milk production

13

Embryonic (2nd-8th week)

the inner portion of the blastocyst becomes the embryonic disk

14

Endoderm

epithelial lining, digestive

15

Mesoderm

Muscle, bone, blood, CT, internal repro organs, kidneys

16

Ectoderm

Nervous, epidermis

17

Chorion

second layer of the trophoblast develops

18

Chronic Villi

Projections, grow from this into the endometrium

19

Connecting Stalk

attaches embryo to the placenta, this eventually gives rise to the umbilical cord

20

Syncytiotrophoblast

separates embryonic blood from maternal blood but allows for the exchange of blood gases and nutrient/wastes

21

Amnion

second inner membrane develops around the embryo producing and containing amniotic fluid

22

Teratogens

factors causing congenital malformations by affecting the embryo during rapid growth

23

Lanugo

downy hair

24

Flow of blood from umbilical cord

A image thumb
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Blood flow from umbilical cord (word version)

Umbilical vein--> liver and ductus venosus. from the ductus venosus to the LUC--> right atrium--> foramen ovale--> left atrium--> left ventricle--> to the heart and brain. from the brain to the super vena cava--> right ventricle--> pulmonary trunk--> ductus arteriosus--> arch--> to the lower body and the cord

26

Parturition

birth process

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Early hormones during birth

progesterone, suppresses uterine contractions

28

Placenta

afterbirth

29

Involution

Process of shrinking of the uterus (several week process)

30

Colostrum

first milk

31

Significance of first breath

uncollapses lungs, expands airway