Lesson Notes By Weeks and Term - Senior Secondary 3
Reproduction system in human
Reproduction system in human
TERM – 1ST TERM
WEEK TWO
Class: Senior Secondary School 3
Age: 17 years
Duration: 40 minutes of 5 periods each
Date:
Subject: Biology
Topic: REPRODUCTIVE SYSTEM IN HUMAN
SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to
INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers,
demonstration, videos from source
INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures
INSTRUCTIONAL PROCEDURES
PERIOD 1-2
|
PRESENTATION |
TEACHER’S ACTIVITY |
STUDENT’S ACTIVITY |
|
STEP 1 INTRODUCTION |
The teacher introduces the lesson by showing photograph or chart of a developing feotus |
Students pay attention |
|
STEP 2 EXPLANATION |
Teacher explain how an embryo is developed and the stages involved |
Students pay attention and participate |
|
STEP 3 DEMONSTRATIO N |
Teacher discusses how selective exchange takes place between mother and child |
Students pay attention and participate |
|
STEP 4 NOTE TAKING |
The teacher writes a summarized note on the board
|
The students copy the note in their books |
NOTE
REPRODUCTIVE SYSTEM IN HUMANS
Fertilization is the fusion of gametes, specifically the union of a sperm cell and an egg cell, resulting in the formation of a zygote. Following fertilization, implantation occurs, where the developing embryo attaches to the lining of the uterus for further growth and development.
Development of embryo
The development of an embryo is a complex and gradual process. It begins with fertilization, where a sperm cell fuses with an egg cell, forming a zygote. The zygote undergoes multiple cell divisions, creating a blastocyst. This blastocyst then undergoes implantation, attaching to the uterine lining.
As the embryo develops, it goes through various stages, including gastrulation, where the three germ layers (ectoderm, mesoderm, endoderm) form. Organogenesis follows, during which major organs and structures begin to take shape. Throughout development, the embryo receives nutrients and support from the mother through the placenta.
Selective exchange between mother and child
During pregnancy, a selective exchange occurs between the mother and the developing child. This exchange takes place through the placenta, a temporary organ that forms during pregnancy. The placenta facilitates the transfer of nutrients, oxygen, and waste products between the maternal blood supply and the fetal circulation.
Nutrients and oxygen from the mother's blood pass through the placenta to nourish the developing fetus, while waste products produced by the fetus, such as carbon dioxide and metabolic by-products, are transferred from the fetal blood to the maternal circulation for elimination.
This selective exchange ensures that the growing fetus receives essential substances for development while efficiently removing waste products, contributing to the overall well-being of both the mother and the child during pregnancy.
Removal of excretory products from foetus
The removal of excretory products from the fetus primarily occurs through the placenta. Waste products generated by the developing fetus, such as carbon dioxide and certain metabolic by-products, diffuse from the fetal blood into the maternal bloodstream across the placental barrier.
Once in the maternal circulation, these waste products are transported away from the fetus and eventually eliminated from the mother's body through her excretory organs, such as the lungs for carbon dioxide and the kidneys for other metabolic waste products. This exchange is crucial for maintaining a healthy environment for fetal development and helps ensure the proper elimination of waste without the fetus having its own fully functional excretory system until birth.
EVALUATION: 1. What is fertilization
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively