Sexual Reproduction and Embryo Development

Question 1

What is the process of sexual reproduction in humans?

Answer 1

when a male becomes sexually excited blood rushes to the penis, become erect and is placed in the female vagina. Semen composed of sperm and other secretions from the seminal vesicles and prostate gland is ejaculated into the top of the vagina.

Question 2

What is ejaculation?

Answer 2

The process of releasing semen from the penis.

Question 3

Where does the sperm go?

Answer 3

It swims through the cervix and unterus into the oviducts

Question 4

What happens when an egg is present in the oviducts?

Answer 4

The sperm will fertilize the egg and they fuse to form a zygote while will develop into a baby.

Question 5

Why can only 1 sperm fertilize an egg?

Answer 5

The fertilization membrane lifts from the egg surface enclosing the sperm making sure that no more can enter

Question 6

What is fertilization?

Answer 6

When the nucleus of the sperm fuses with the nucleus of the ovum

Question 7

What happens if no fertilization takes place?

Answer 7

Mentruation takes place.

Question 8

Which part of the sperm enters the egg?

Answer 8

The head

Question 9

What is the fertilized ovum called?

Answer 9

A zygote

Question 10

When does the egg become a embryo?

Answer 10

When it reaches the uterus

Question 11

What is implantation?

Answer 11

When the embryo is embedded in the thick lining o the uterus wall.

Question 12

Where does fertilization take place?

Answer 12

In the fallopian tube.

Question 13

What happens inside the uterus?

Answer 13

As the embryo develops it gets surrounded by a membrane call the amniotic sac which contains a liquid called amniotic fluid.

Question 14

What does the amniotic sac do?

Answer 14

It serves as a cushon against knocks and bumps as the mother moves around her daily routine

Question 15

When is the embryo called a foetus?

Answer 15

From about 12 weeks until the baby is born

Question 16

How does the foetus survive in the uterus.

Answer 16

A tough strand called the umbilical cord is attactched to the adomen of the foetus at one end and the placenta at the other end. It surves as a lifeline between the baby and the mother. The placenta provides a large surface are for exchange of food, oxygen etc

Question 17

What does the placenta consists of?

Answer 17

It consists of blood vessels with spaces in between. The mothers blood runs through the spaces while the baby’s blood run through the vessels. The mothers blood flows through the placena carrying food oxygen which is then passed into the baby’s blood through the thin blood vessels. Carbon dioxide and waste materials pass from the baby’s blood to the mother’s .

Question 18

What does the artery in the umbilical cord do?

Answer 18

Carries deoygented blood with waste products from the foetus to the placenta.

Question 19

What does the vein in the umbilical cord do?

Answer 19

Carried oxygenated blood with food and oxygen from the placenta to the foetus

Question 20

What is another word for pregancy?

Answer 20

gestation period

Question 21

What is pregancy?

Answer 21

The time between conception and birth

Question 22

How does the baby position itself when its ready for birth?

Answer 22

Head downward above the cervix

Question 23

What happens to the cervix during birth?

Answer 23

A ring of muscles around the neck of the womb dilates and at the same time the uterus begins to undergo a series of contractions which are gentle at first but become more powerful and frequent. This is called labour.

Question 24

What is the breaks of the water?

Answer 24

When the amniotic sac bursts and the amniotic fluid flows out the vagina.

Question 25

What is the birthing process also known as?

Answer 25

Delivery

Question 26

What happens after birth?

Answer 26

The umbilical cord is cut and the placenta falls out.

Question 27

What is a zygote?

Answer 27

A fertilized ovum

Question 28

What is an embryo?

Answer 28

A zygote which has been divided into 100 cells