Pregnancy and Lactation Flashcards Preview

Animal Physiology > Pregnancy and Lactation > Flashcards

Flashcards in Pregnancy and Lactation Deck (28):
1

zygote

an ovum that is fertilized

2

male pronucleus

the nucleus of a spermatozoon after fertilization

3

female pronucleus

the nucleus of a ovum after fertilization

4

placentome

separate attachment sites of the cotyledonary placenta

5

gestation period for cattle

9 months

6

gestation period for dogs

2 months

7

gestation period for cats

2 months

8

gestation period for goats/sheep

5 months

9

gestation period for horses

11 months

10

gestation period for pigs

3 months, 3 weeks, 3 days

11

what hormone stimulates the uterus?

oxytocin, released to contract the uterus during copulation to help move sperm to the oviducts

12

corna radiata

layers of cumulus cells from the follicle

13

zona pellucida

thick, gel like membrane that surrounds the ovum's cell membrane

14

stage 1 of ejaculation

- sperm move from epididymis
- fluids from accessory repro glands move into pelvic portion of urethra
- sphincter muscle around neck of urinary bladder closes

15

stage 2 of ejaculation

- rhythmic contraction of smooth muscle around urethra to propel sperm forward
- semen is pumped out into female repro tract through the cervix into the uterus

16

stages of cleavage

- rapid mitosis of zygote
- cells become a morula and then a blastocyst
- blastocyst embeds itself into the endometrium

17

when does the placenta begin to form?

as soon as the blastocyst is implanted

18

what are the layers of the placenta?

amnion, allantois, and choriun

19

amnion

the layer immediately around the fetus in the placenta

20

allantois

surrounds the amniotic sac which forms another fluid filled sac

21

chorion

the outside of the allantoic sac, which attaches to the uterine lining

22

1st trimester of pregnancy

embryonic period, when the placenta develops

23

2nd trimester of pregnancy

fetal development period, when the body tissues, organs and body systems develop

24

3rd trimester of pregnancy

fetal growth period, the formation and growth of the fetus

25

fetal changes after birth

lungs expand and begin to function, negative pressure from first breath will close both the foramen ovale and the ductus arteriosus

26

parturition

triggered size and weight of the uterus and fetus, as well as changes in hormonal levels

27

what structure does the fetus use to expel waste?

the urachus

28

what does the umbilical cord contain?

umbilical arteries, umbilical vein, and the urachus