"The Birth of New Life" PPT (first lesson)

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"The Birth of New Life" PPT (first lesson)

Part One: Understanding Sperm and Egg Cells

Sperm - male reproductive cells

Sperm are much smaller, about 0.05 mm long, have a tail and can swim.

Egg cell - female reproductive cell

Egg cells are spherical, 0.1 mm in diameter, and are the largest cells in the human body

male reproductive system

The testes can produce sperm and are the main male reproductive organs. An adult man can produce hundreds of millions of sperm a day. It can also secrete male hormones.

female reproductive system

The ovaries are the main female reproductive organs and can produce eggs. Adult women will release one mature egg approximately every month. The ovaries can also secrete estrogen. The uterus is the place where new life is conceived.

The birth of new life PPT, part two: discussion

The instructions for some medicines often say "Use with caution during pregnancy" or "Contraindicated during pregnancy". Why is this?

Medicines have some side effects, which the mother can bear. However, these drugs can act on the fetus through the placenta. Since the fetus is young and its organ systems are not fully developed, it may not be able to withstand the toxic and side effects of these drugs, affecting the development of the fetus, and even causing teratogenesis and death. If pregnant women drink, smoke, or take drugs, they can also poison the fetus.

1. A baby must cry loudly when he is just born, otherwise he may die. What effect does this cry have on the baby?

The moment the doctor cuts the umbilical cord, the baby's source of oxygen is cut off. Crying fills the baby's lungs with air and initiates spontaneous breathing.

2. What is the scar formed after the baby's umbilical cord is cut?

After the umbilical cord is cut, it will dry up and become scarred in about 10 days, which is the navel.

3. Newborn baby’s diet.

Breast milk: Because it is rich in nutrients and disease-fighting substances

The birth of new life PPT, the third part: give it a try

1. Male reproductive organs include ( )

① Uterus ② Seminal vesicles and prostate ③ Vas deferens ④ Testis ⑤ Epididymis ⑥ Vagina

A. ① ② ③ ⑤ B. ② ③ ④ ⑤

C. ② ③ ④ ⑥ D. ③ ④ ⑤ ⑥

2. The true meaning of fertilization is ( )

A. The sperm comes into contact with the egg. B. The whole sperm enters the egg cell.

C. The sperm cell nucleus fuses with the egg cell nucleus. D. Many sperm enter the egg cell.

3. Sperm is like a tadpole, with a head and a long tail. What do you guess is the function of the long tail of sperm?

Answer: Sperm rely on their long tail to swim flexibly, which is conducive to fertilization.

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For more information about "The Birth of a New Life" PPT courseware, please click the "The Birth of a New Life" ppt tag.

"The Birth of New Life" PPT (second lesson):

"The Birth of New Life" PPT (Second Lesson) Part One Content: Discussion The instructions for some medicines often state that pregnant women should use with caution and pregnant women should not use them. Why is this? Medicines have some side effects, which the mother can bear. But these drugs can pass through the placenta...

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Update Time: 2024-11-21

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 2 industry PPT template

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