"The combination of sperm and egg gives birth to a new life" PPT

Description

"The combination of sperm and egg gives birth to a new life" PPT

Part One: Structure and Function of the Human Reproductive System

functions of male reproductive system

produce sperm

secrete male hormones

Transport sperm to the female reproductive organ, vagina

1 produce sperm

Sperm produced in human testicles

no obvious periodicity

Adult male testicles produce hundreds of millions of sperm every day

2 Secrete male hormones

androgens

Can stimulate the development of male sexual organs

Maintain male secondary characteristics

3. Transport sperm to the female reproductive organ, vagina.

Sperm and egg combine to give birth to new life

Sperm must go through a difficult journey to move to the egg. Generally, only one sperm can combine with the egg cell

functions of female reproductive system

produce eggs

secrete estrogen

Receive sperm and provide a good development environment for fertilized eggs and embryos, etc.

1 produces eggs

The eggs produced in the human ovary are cyclical, and only one egg matures in each cycle.

Adult women produce one mature egg cell every month

2 Secrete estrogen

estrogen

Can stimulate the development of female sexual organs

Maintain female secondary characteristics and sexual cycle

3. Receive sperm and provide a good development environment for fertilized eggs and embryos.

The combination of sperm and egg gives birth to a new life PPT, the second part: the fertilization process

human germ cells

sperm testicular production

egg ovary production

fertilization

The process of combining sperm and egg

fertilized egg

cells formed from the union of sperm and egg

Sperm and egg union

Women generally have only one mature egg a month, which travels from the ovary to the fallopian tube. At this time, if you happen to encounter a sperm swimming into the fallopian tube, it will combine with the sperm.

The combination of sperm and egg gives birth to a new life PPT, the third part of the content: Class summary

male reproductive system

Testicles: produce sperm and secrete male hormones

Vas deferens: carries sperm

female reproductive system

Ovary: produces eggs and secretes estrogen

Fallopian tube: transports egg cells

Uterus: The place where the embryo and fetus develop

Site of fertilization: fallopian tube

The largest cell in the human body is: egg cell

The structure for material exchange between fetus and mother is: placenta

The combination of sperm and egg gives birth to a new life PPT, the fourth part: thinking and practice:

1. The main male sexual organ is _____, and its function is___________.

2. The main sexual organ of women is _______, and its function is ______.

3. Human reproductive cells are _______ and _______.

4.The largest cell in the human body is _______.

5. _____ is a structure for material exchange between the fetus and the mother.

6. The site of fertilization is __________.

7. Human embryonic development starts from one cell __________.

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware for the second volume is free to download, the combination of sperm and egg gives birth to a new life PPT download, .PPT format;

For more information about the PPT courseware "The Union of Sperm and Egg Breeds New Life", please click the "The Union of Sperm and Egg Breeds New Life" PPT courseware.

"The combination of sperm and egg gives birth to a new life" PPT download:

"The combination of sperm and egg gives birth to a new life" PPT download Part One: Introduction of new lesson Sperm must go through a difficult process before it can move to the egg. Generally, only one sperm can combine with the egg to form a fertilized egg, which then develops into a new individual through embryonic development. So, people...

"The combination of sperm and egg gives birth to a new life" PPT courseware:

The first part of the PPT courseware "Sperm and egg combine to give birth to new life": Where did I come from when introducing the new lesson? Learning objectives 1. Overview the structure and function of the male and female reproductive systems; 2. Explain that testicles and ovaries are male respectively. and the main female reproductive organs. ..

File Info

Update Time: 2024-09-06

This template belongs to biology courseware Jiangsu Education Edition Seventh Grade Biology Volume 2 industry PPT template

Preview