"Human Reproduction" The Origin of Man PPT Courseware 2

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"Human Reproduction" The Origin of Man PPT Courseware 2

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male reproductive system

Androgen: Also known as "male hormone". A hormone that promotes the maturation of male accessory sexual organs and the appearance of secondary sexual characteristics, and maintains normal sexual desire and reproductive functions.

Estrogen: Also known as "female hormone". A hormone that promotes the maturation of female accessory sexual organs and the appearance of secondary sexual characteristics, and maintains normal sexual desire and reproductive functions.

Secondary sex characteristics: also called accessory sex characteristics. The gender-related appearance characteristics of humans and animals as they mature sexually. When both men and women reach puberty, a series of gender-related characteristics appear due to the influence of sex hormones secreted by the gonads. Male symptoms include whiskers, protruding Adam's apple, thick bones, and deep voice. Female symptoms include developed breasts, wide pelvis, abundant subcutaneous fat, and high-pitched voice.

independent inquiry

1. What is fertilization?

The process of combining sperm and egg cells to form a fertilized egg

2. 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

3. Where is the site of fertilization?

oviduct

4. What changes will happen to the fertilized egg?

divides to form blastocyst

5. What is the beginning of pregnancy (also called pregnancy)?

blastocyst implants into endometrium

6. Describe the process of development

7. How do the embryo and mother exchange materials?

placenta and umbilical cord

Compliance testing

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

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

2. When did 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 ( )

①Sperm ②Egg cell ③Semen ④Ovary ⑤Testicle

A.①②③④⑤ B.①②③ C.①② D.②④

5.The main function of testicles is ( )

A. Produce sperm and secrete male hormones B. Produce only sperm

C. Store sperm D. Only secrete male hormones

6. The tube that transports sperm to the outside of the body is ( )

A. Vas deferens B. Epididymis

C. Vas deferens and epididymis D. Seminal vesicles

True or False:

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

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

3. The uterus is the reproductive organ that secretes estrogen ( )

4. Twins are produced by the union of two sperm and one egg cell ( )

5. 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 ( )

do you know?

Each ovary of a newborn baby girl contains approximately 750,000 primordial follicles. Starting from puberty, about 15 to 60 follicles grow and develop every month, and usually only one follicle matures.

The volume of a human ejaculate is about 3 milliliters, and the number of sperm per milliliter is about 50 million to 150 million.

Egg cells released from mature follicles can survive for approximately 72 hours, and fertilization is most likely to occur 6 to 24 hours after ovulation.

Sperm can survive for about 1-2 days after entering the female reproductive tract.

practise

1.The largest cell in the human body is ( )

A. Sperm B. Oral epithelial cells

C.Mature egg cell D.Muscle cell

[Analysis] Choose C. This question mainly tests the recognition of egg cells. Mature egg cells are the largest cells in the human body. They are spherical in shape and have a diameter of about 0.1 mm or more. They contain certain nutrients to meet the needs of the initial development of fertilized eggs.

2. The nutrients needed for embryonic development mainly come from ( )

A. Mother B. placenta

C． The egg cell itself D. embryo itself

3. How long does it take for an embryo to develop into a human shape ( )

A. Two weeks later b. two months later

C． Six months later D. nine months later

4. The result of childbirth is ( )

A. Formation of blastocyst B. form embryo

C． Develop into a fetus D. Newborn born

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Update Time: 2024-06-26

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

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