Fertilisation, Copulation and Gestation PDF

Summary

This document appears to be a presentation or lecture handout focused on human reproduction. It covers topics like copulation, fertilization, gestation, and fetal development. Diagrams and key concepts are included. It may be part of a bigger course or study material.

Full Transcript

Are copulation and fertilization the same thing? NO Copulation/ Fertilization sexual The fusion of intercourse the sperm The transfer of sperm nucleus with from the the egg penis into the nucleus to vagina of the...

Are copulation and fertilization the same thing? NO Copulation/ Fertilization sexual The fusion of intercourse the sperm The transfer of sperm nucleus with from the the egg penis into the nucleus to vagina of the form a diploid female. zygote you remember the numbered Area Area parts of 2 3 the female it will need to area swim 1 through before reaching the egg? Sperm needs to travel far and the acidic environment of the vagina is hostile for sperm. Semen contains the sperm as well as Seminalfluid. seminal fluid has water( medium to swim in), sugars provide energy, alkaline pH allows to neutralise acidic vagina and there is mucous from the Cowpers gland. Fertilisati on WHERE DOES IT OCCUR? tubes- one sperm fuses with one egg Gestation Do you know what it means? Pregnancy/gestation The period from fertilisation to birth. In humans between 38-40 weeks. The first cell after fertilisation is called the zygote, it is diploid. It moves along the fallopian tubes and divides by mitosis and forms a ball of cells called the morula. The morula develops into a hollow, fluid filled ball called the blastocyst. IMPLANTATION Implantation -the blastocyst attaches itself to the lining of the uterus. Usually 10 days after fertilization. First 8 weeks the developing individual is called an embryo The embryo develops into three layers, the ectoderm, mesoderm and endoderm. All tissues and organs develop from these three layers. This is a critical time in development. FOETUS After 3EMBRY months , when all the organs are O it is called a foetus in place Ultrasound- allows the age, size to be seen as well as if development is normal You do not need to study the table of development on page 110- just read through it. Do LA 12 on page

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