Pregnancy

Question 1

Where does fertilization occur?

Answer 1

Fallopian tube

Question 2

Explain the zygote?

Answer 2

• in the fallopian tube
• Made of stem cells which are undifferentiated (no function)

Question 3

Explain a blastocyte?

Answer 3

• in the uterus
• Created by differentiation in the zygote
• performs implantation by attaching to endometrium

Question 4

What happens after implantation?

Answer 4

The process of gastrulation that change blastocyte into a gastrula

Question 5

What are the 3 germ layers and their functions?

Answer 5

Ectoderm: outer layer - develops C.N.S and P.N.S as wells as skin

Mesoderm: middle layer - muscular system, skeletal system (cartilage), reproductive system and cardio vascular (heart)

Endoderm: inner layer - digestive system and respiratory system

Question 6

Explain Positive Feedback Loop?

Answer 6

Chrorion secretes hCG, then it goes into the ovary (corpus luteum), which secrete progesterone, then to the uterus, preventing contractions

Question 7

What happens with pregnancy hormones on trimester 2 & 3?

Answer 7

Placenta secretes progesterone

Question 8

What happens during birth?

Answer 8

Progesterone levels drop which allow contractions to begin

Question 9

What are the 2 hormones that causes contractions and explain them?

Answer 9

Oxytocin: origin - pituitary: target - uterus

Prostaglandins: origin - placenta: target - uterus: causes cervical dilation

Question 10

Explain the hormones in lactation?

Answer 10

Prolactin: origin - pituitary: target mamory glands: makes milk

Oxytocin: origin - pituitary: target- mamory glands: causes contractions to push out milk

Question 11

What is the zygote made of?

Answer 11

Stem cells