Question | Answer |
How is the embryo protected | The placenta acts as a filter and prevents some harmful substances and germs from entering the embryo |
What surrounds the embryo | A sac called the amnion |
What Is the function of the amniotoc fluid | To protect the baby,sterilized and lubricate the birth canal and helps keep the body warm |
Indentify two materials that pass from mother to foetus and two that pass from foetus to mother | Oxygen,food,carbon dioxide and wastes |
Name two structures that make up the afterbirth | Placenta and umbilical cord |
Explain how identical and fraternal twins are form | Fraternal twins arise if two eggs are shed from the ovaries at the same time and both fertilized.identical twins arise when a single egg is shed from one of the ovaries and fertilized in the usual way then spilts into two cells,each of which develops into |
How old is a boy when he starts to make sperm | 11 or16 years old |
What is the harmone that causes boys to grow chest hair | Testosterone |
At what age does a girl start to see her period | 10 or15 years old |
What is the name of the harmone that causes girls breast to develop | Estrogen |
Where is ova and sperm made | Ova is made in the ovary and sperm is made in the testes |
What is fertilization | Fertilization is the joining of a male sex cell,a sperm,with a female sex cell,an ovum,to form a new cell |
What is the next term for a fertilized egg | Zygote |
What cause a penis to become erect | When blood has filled the spaces in erectile tissue |
What is pregnancy | The development of the fertilized egg into a new baby |
What is implantation | The sinking of the fertilized egg into the lining of the of the womb |
When does pregnancy begins | When the ball of cells implants itself |
How long does it take for a fertilized egg to be implanted | One or more hours |
What is the menstrual | The time between one period and the next is the menstual cycle |
How long does each menstrual cycle usually take | 28 days |
What happens during a menstrual period | The lining of the uterus breaks apart.as menstruation begins an egg starts to mature in the ovary |
What happens 14 days after the start of the period | A mature egg is released from the ovary |
What is the release of a mature ovum called | |
What harmonies does the ovary produce | Estrogen and progesterone |
What is the difference between the embryo and the fetuos | The embryo is an unborn offspring in the process of development and the fetus is the start of an developing of pregnancy till delivery |