"Human Reproduction" The Origin of Man PPT Courseware 3

Description

"Human Reproduction" The Origin of Man PPT Courseware 3

Questionnaire

1. What is your gender? your age?

2. Did your parents take the initiative to talk about sex with you?

3. Where do you usually learn about sex?

A. Books, computers, etc. ( ) B. Friends ( )

C. Parents ( ) D. Teachers ( )

4 Do you know about menstruation or nocturnal emissions?

5 Have you (for girls) already experienced menstruation?

6 Have you (please fill in as a boy) already experienced nocturnal emissions?

Reproduction - refers to the process of producing reproductive cells and reproducing new individuals, which is also the process of racial continuation. This process is completed by the reproductive system.

discuss

1. In the male and female reproductive systems, what are the organs that produce and transport germ cells?

2. Is the name of the uterus related to its function? Why?

Sperm: It is the smallest cell in the male body.

Sperm is very small, shaped like a tadpole, with a total length of 60 microns, making it the smallest cell in the male body. The speed of the long tail is 18 cm/hour. The volume of semen discharged by men each time is about 2-5 ml, and there are about 100 million sperm in each ml.

Egg cell: spherical, with a diameter of more than 0.1 mm, and is the largest cell in the human body. There is yolk in the cell, and the yolk contains a certain amount of nutrients to provide nutrients for the early development of the embryo. The egg cannot move freely and must rely on the contraction of the fallopian tube smooth muscle and the ciliary movement of the epithelium to passively move toward the uterine cavity.

independent inquiry

1. What are the main male reproductive organs? What is the role of each?

2. What are the main female reproductive organs? What is the role of each?

Main organs of the male reproductive system

Testicles: produce sperm and secrete male hormones

Epididymis: stores sperm

Vas deferens: carries sperm

Seminal vesicles and prostate: secrete mucus

main organs of female reproductive system

Ovary: produces eggs and secretes estrogen

Fallopian tube: transports egg cells

Uterus: the place where the embryo develops

Vagina: the channel through which sperm enters and the fetus is delivered

reproductive process

It mainly includes the production of germ cells, fertilization, embryonic development, childbirth and lactation.

1 Fertilization - the union of egg cells and sperm cells.

Singleton birth (one egg and one sperm);

Twins (two eggs and one sperm)

2 Embryonic development: begins with the division of the fertilized egg and ends with the production of the fetus.

Week 4 (Heart can beat)

Week 5 (head, eyes, hands)

Week 18 (swallowing amniotic fluid and getting into the digestive tract)

Week 20 (with hair)

4 weeks to a month

Display and exchange

1 What is fertilization? ——Sperm and egg cell combine.

2 Where is the site of fertilization? --oviduct.

3. What changes will happen to the fertilized egg? ——Carry out division to form blastocyst.

4. Where should the blastocyst be implanted? ——The blastocyst is implanted into the uterus

5 Describe the process of fertilization. ——Sperm enters the fallopian tube through the vagina and uterus. Egg cells are encountered here. Sperm and egg cells combine to form a fertilized egg.

6 Describe the process of development - the process of development should be: fertilized egg ─ blastocyst ─ embryo ─ fetus

7. How do the embryo and mother exchange materials? ——Through the placenta and umbilical cord.

1. The place where the embryo and fetus develop is ( )

A. Ovary B. uterus c. Fallopian tube D. vaginal

2. When does new life begin? ( )

A. Egg cell and sperm B. Fertilized egg C. Embryo D. When the baby is born

3. Fetus refers to ( )

AThe embryo from the fertilized egg to the time before the baby is born

B. The embryo from when the fertilized egg divides until the baby is born

C. From the end of the first month of embryonic development to the embryo before birth

D. The end of the second month of embryonic development, to the embryo before birth.

4. Which of the following are germ cells ( )

① Sperm ② Egg cell ③ Semen ④ Ovary ⑤ Testicle

A.①②③④⑤ B. ①②③ C. ①② D. ②④

2. Judgment questions:

The formation of a fertilized egg is the beginning of a new life.

People often say "Ten months of pregnancy, one day of delivery", which means that the fetus must be pregnant in the mother's body for ten months.

The uterus is the reproductive organ that secretes estrogen.

Twins are produced by the union of two sperm and one egg.

The blood type of the fetus can be different from that of the mother. Under normal circumstances, blood agglutination does not occur because the blood of the mother and the fetus are not directly connected.

Keywords: The origin of man teaching courseware, human reproduction teaching courseware, New People's Education Edition seventh grade biology PPT courseware for the second volume, seventh grade biology slide courseware download, the origin of man PPT courseware download, human reproduction PPT courseware download,. ppt format

For more information about the PPT courseware "The Origin of Man and Human Reproduction", please click on the "Origin of Man ppt Human Reproduction ppt" tag.

"Human Reproduction and Development" PPT download:

"Human Reproduction and Development" PPT Download Part One: Teaching Purpose Knowledge: 1. Tell the stages of postnatal development; 2. Explain the characteristics of pubertal development. Ability: Cultivate students to ask questions, observe, discuss, read, analyze data, etc..

"Human Reproduction and Development" PPT courseware:

"Human Reproduction and Development" PPT courseware Part One: Learning Objectives 1. Understand the characteristics of pubertal development and the concept of health care. 2. Understand the various stages of human development and other aspects. Learn the physiological characteristics of adolescence and understand that this period is a time for learning...

"Human Reproduction and Development" PPT:

"Human Reproduction and Development" PPT Part One Content: Topic Exploration 1. When biological growth and development reaches a certain stage, new individuals will be produced, which reflects the _____ characteristics of living things. 2. On the basis of metabolism and under the regulation of nerves and hormones, the body's _____..

File Info

Update Time: 2024-11-24

This template belongs to biology courseware People's Education Press seventh grade biology book volume 2 industry PPT template

Preview