The Miracle of Life Questiosn - Mrs. Hall's Science Class BRMS



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© Paul Galpern, 2003

paul.galpern@utoronto.ca

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NOTE:

These questions are from the video The Miracle of Life chronicling the journey of a sperm and an egg towards pregnancy. It is a fabulous resource for teaching this material. It was produced by Nova in the late 1980s (?) and is generally available from scientific teaching supply houses.

Name: Date: Period:

Reproduction – Human Development

Miracle of Life Questions

Watch the video, and answer these questions while you are watching.

If you miss something, fill it in at the end.

THE PATH TRAVELED BY THE EGG

WHEN SPERM ENTERS THE FEMALE BODY

There are many barriers (things to overcome) for a sperm to reach the egg. Some of these are:

SPERM ENTER THE FALLOPIAN TUBE

THE EMBRYO DEVELOPS INTO A FETUS

Once it has begun to divide the fertilized egg is called a _________.

As the zygote divides, it moves along the fallopian tube toward the __________.

|Number of weeks since|Appearance of embryo/fetus |

|fertilization | |

|After two weeks (3 | |

|weeks) | |

|4 weeks | |

|5 weeks | |

|6 weeks | |

| | |

| | |

|7 weeks | |

| | |

| | |

|8 weeks | |

| | |

|11 weeks | |

|14 weeks | |

|15 weeks | |

|16 weeks | |

| | |

All of its important features have been developed, but it will take another __________weeks before it can survive outside its mother.

Science, Gr. 9

Reproduction – Human Development

Miracle of Life Questions

Watch the video, and answer these questions while you are watching.

If you miss something, fill it in at the end.

THE PATH TRAVELED BY THE EGG

The egg travels through the fallopian tubes after being released from the ovaries.

The fertilized egg contains DNA from both parents.

The egg is surrounded by a cloud of support cells.

These hairs, called cillia move the egg along towards the uterus.

It takes the egg 28 days to travel 6 inches along the fallopian tube.

The egg must join with a sperm within 24 hours in order for conception to take place. If no sperm are present the egg dissolves.

WHEN SPERM ENTERS THE FEMALE BODY

Nearly 25% of the sperm will die almost immediately after entering the woman’s body.

Sperm will remain viable (able to survive) only 48-72 hours.

The sperm have one goal: Find the egg.

There are many barriers (things to overcome) for a sperm to reach the egg. Some of these are:

1. Bacteria 4. Support Cells

2. Cervix 5. Zona

3. Acidity of Vagina

SPERM ENTER THE FALLOPIAN TUBE

The fallopian tube has 2 openings; one leads to the uterus and the other to the ovaries.

Of the 200 million sperm that enter, only about 50 ever reach the egg.

Only 1 sperm will enter and fertilize the egg.

Once inside the egg, the sperm undergoes a big change, it sheds its coating.

The genetic material is released from the head of the sperm.

Within 24 hours, the new cell begins to divide.

THE EMBRYO DEVELOPS INTO A FETUS

Once it has begun to divide the fertilized egg is called a zygote.

As the zygote divides, it moves along the fallopian tube toward the Uterus.

|Number of weeks since|Appearance of embryo/fetus |

|fertilization | |

|After two weeks (3 |has elongated (grown long) |

|weeks) |it is barely 1/10th of an inch long |

|4 weeks |has arm buds, and is curled |

| |it has the beginning of eyes |

|5 weeks |nose begins to take shape |

|6 weeks |leg buds appear |

| |embryo is less than 1/2 inch long |

| |it floats inside the fluid filled amniotic sac |

| |its spine is clearly visible |

|7 weeks |embryo is ¾ of an inch long |

| |can move its hands and fingers, where there are clearly defined fingers |

| |its organs are visible |

| |eye lenses are formed |

|8 weeks |fingers are clearly seen |

| |the joints of the feet are clearly visible |

|11 weeks |embryo is 2 ½ inches long |

|14 weeks |it can bring its hands together and suck its thumb |

|15 weeks |organs of senses are nearly formed |

|16 weeks |turning inside the mother |

| |now a fetus that is 5 ½ inches long |

| |eyes are closed, but the fetus can see |

| |The umbilical cord is the fetus’ link to its mother, the source of its life. |

All of its important features have been developed, but it will take another 8 more weeks before it can survive outside its mother.

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