Sperms

Question 1

How do spermatogonium (stem cells) cells divide?

Answer 1

mitosis

Question 2

Diploid

Answer 2

2 identical daughter cells

Question 3

After mitosis, one becomes…

Answer 3

primary spermatocyte

Question 4

How does primary spermatocyte divide?

Answer 4

Meiosis

Question 5

Meiosis I

Answer 5

Chromosones double, forms tow haploid (secondary) spermatocytes

Question 6

Meiosis II

Answer 6

Chromatids divide 4 spermatids w/ 23 chromosones each

Question 7

3 germ layers

Answer 7

Ectoderm
Mesoderm
Endoderm

Question 8

Embryo @ 3 weeks

Answer 8

Brian & spinal cord form. Heart beat.

Question 9

Embryo @ 5 weeks

Answer 9

Brian divided.

Eye, ear, limb buds, tail, somites, gill slits

Question 10

Fetus @ 8 weeks

Answer 10

Has all organs & body parts . Now officially a fetus

Question 11

Somites become…

Answer 11

skeletal muscle / vetebra

Question 12

Gill slits become…

Answer 12

jaw structure

Question 13

Decidua parietalis

Answer 13

part of endometrial wall that lines uterine cavity

Question 14

Placenta made of

Answer 14

Chorionic villi of embryo
AND
Stratum functionalis of maternal uterus

Question 15

Do maternal and fetal blood vessel unite?

Answer 15

NO - blood does not mix. Intervillious space.

Question 16

Placenta & Umbilical cord function

Answer 16

Diffusion of O2, nutrients

Barrier to microorganisms

Question 17

What viruses can cross barrier?

Answer 17

AIDS, measles, chickenpox

Question 18

Is placenta a barrier to drugs/alcohol?

Answer 18

NO.