Miracle of life 2 ans key PDF

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Summary

For lectures to aid student to study and understand their field in medicine, especially to nursing students....

Description

The following document is a teaching resource available at www.MorrowGalpern.ca

© Paul Galpern, 2003 [email protected]

Saved in Microsoft Word 2000 format. BEWARE! If you do not have this software or a later version on your computer, many of the layout features (tables and graphics) will not appear as intended.

Like all teaching resources it is a work in progress. Permission is granted to use, alter and reproduce this resource for your own classroom. For publication, please contact the author for permission.

I’d love to hear what you think about this resource. Please drop me a line through my website: www.morrowgalpern.ca/contact/index.htm 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: Reproduction – Human Development

Date:

Period:

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 Appearance of embryo/fetus weeks since 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 Appearance of embryo/fetus weeks since fertilization After two has elongated (grown long) weeks (3 it is barely 1/10th of an inch long weeks) 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

7 weeks

its spine is clearly visible embryo is ¾ of an inch long can move its hands and fingers, where there are clearly defined fingers its organs are visible

8 weeks

eye lenses are formed 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 16 weeks

organs of senses are nearly formed 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....