Making experiments with dissolutions
HOW DOES THE MALE REPRODUCTIVE SYSTEM WORK?1.- First, sperm cells are produced inside the testicles.
2.- Then the vas deferens transport sperm cells from the testicles to the seminal vesicles.
3.- Next, the sperm cells are transported through the prostate into the urethra.4.- Finally the semen travels through the urethra and out of the penis. This process is called ejaculation.
Fertilization and Pregnancy
A man and a woman have sexual intercourse.
The man deposits his semen in the woman's vagina.
The sperm cells swim into the uterus and up the fallopian tubes, where one of them will fertilise the female egg cell.
When a sperm cell joins with an egg cell in the fallopian tube, they form a new cell called a zygote (click here to watch a video about fertilisation).
The zygote that results goes into the uterus. as it travels, it divides many times to form a group of cells called an embryo, and finally it develops into a fetus.
Pregnancy is the period of time between the fertilisation of an egg cell and the birth of a baby.
The placenta provides the fetus with oxygen and nutrients from the mother's blood. It also takes away carbon dioxide and waste that the fetus produces.
The fetus is connected to the placenta by the umbilical cord.
The amniotic sac contains a liquid called amniotic fluid. This liquid supports the fetus and protects it.
Nutrition is the study of food and how it works in your body. Nutrition includes all the stuff that's in your food, such as vitamins, protein, fat, and more. It's important to eat a variety of foods, including fruits, vegetables, dairy products, and grains, so you have what you need to grow and be healthy.
NOW; CAN YOU ANSWER THE FOLLOWING QUESTIONS?
More information about the digestive system-Click please
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Some videos about how our senses work
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