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Hi everyone, Assalamualaikum warahmatullahi wabarakatuh.
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This is a tutorial video for the 9th grade of Merdeka Curriculum. And this time we will learn chapter 1, namely about growth and development. For the 7th and 8th grade tutorial videos, you can also check the link in the upper right corner at the end of the video or in the description column. At the age of teenagers like you, you must be asking a lot of questions. What is happening to my body?
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Why is my body getting taller, then my voice changes, my face starts to get acne, and so on. Well, that's normal because you are growing and developing.
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In this chapter, we will learn about the growth and development of living beings. So there are three reasons that will be learned. The first is the growth and development of humans. Then the second is the growth and development of animals. And the third is the growth and development of plants.
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and in this video we will only focus on discussing the first one, growth and development in humans. Well, let's get started. Okay, first we will first know what is the difference between growth and development.
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Well, the words growth and development are not very different. Growing means growing and growing bigger. But for living creatures, growing and developing have different meanings. Growing is a process that can be measured with a measuring instrument.
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For example, your body height, weight, etc. can be measured. Your body height increases from the initial 100 cm to 150 cm.
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The opposite is different with development if this development cannot be measured by numbers. So, development is an additional process of human ability in various aspects. For example,
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In a baby, when he was young, he could not speak. However, when he was 4 years old, the child was very fluent in speaking. That's what is called development. Is it easy to understand? Next, we will discuss the human life cycle. The first starts with the baby.
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When the sperm and egg cells meet, the fertilization process begins. Human fertilization occurs in the female body. After fertilization, the cells will turn into zygote that is ready to grow. This zygote will hatch continuously in a mitosis. Finally, the zygote will be in the morula phase, which is the addition of cells without cell mass.
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From this morula phase, the cells continue to split until they form a cavity. This phase is called blastula. While the cells are called blastocysts.
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After that, the cell will enter the gastrula phase, then grow into an embryo. After 8 weeks, this embryo will grow into a fetus or fetus. At this stage, the process of forming body organs has already begun. This fetus or fetus will continue to grow until it is finally born into a baby.
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Okay, then after the baby is born, for 1 to 2 years of life, the baby will grow and grow rapidly. The weight of the baby can grow many times compared to the time they were born. When they are born, the head of the baby will be one fourth of the length of their body. But over time, other parts of the body will also grow and adapt.
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The nervous system and the muscles also started to develop so the baby can start to make movements such as crouching, walking and then walking. They will also start to learn to talk and follow simple commands. Next in the next cycle is the childhood. This childhood started at the age of 2 years.
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They grow bigger and higher. Motor skills and coordination also develop. The desire to know is also higher and the mental ability is also very developed.
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their ability to speak also increased drastically. The illustration you can see in the picture is an example of the development of motor skills in children at the age of 3-5 years old. So there you can see how the development and growth of children started from the age of 3 years, then 4 years and 5 years. Next in the next cycle is the teenage and puberty.
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This phase is the most difficult phase for children because of what? Because there are many changes in the body, both physically and mentally. Teenage is the phase of children's changes to adults. This phase usually starts at the age of 9 to 15 years old.
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This puberty is marked by the active start of reproductive hormones, meaning that at this stage a teenager is able to reproduce. The reproductive hormone that plays a role in women is estrogen and progesterone, then in men is called testosterone hormone.
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Next, I will show you some sexual development in men and women starting from men first the first sign is hair growth on the face like mustache and mustache the second sign is the voice starts to grow and grow
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3. Hair growth in the scalp 4. Hair growth in the vagina 5. Reproduction of organs 6. Penis and testicles start to produce sperm 7. Sexual development in women
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First, hair growth in the scalp, then the lungs grow, the buttocks and buttocks grow, hair growth in the genitals, and the reproductive organs begin to function, which is marked by the beginning of the menstruation period.
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Next, enter the adult cycle After puberty, human mental, emotional and physical conditions start to stabilize At this time, humans will enter adulthood and in adulthood, this no longer experiences high increases and sexual growth secondary has stopped
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At the age of 30, humans will experience signs of pregnancy, such as growth of uterus or decreased muscle mass.
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Then in the 40s to 50s, in the middle of the period, women will start to stop having menstruation or what is usually called menopause. Meanwhile, in men, the sperm production will decrease. However, by applying a healthy lifestyle, it is hoped that men and women will remain active throughout their lives.
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after the age then humans will enter the old age can be understood yes? Well, that was the explanation about growth and development in humans if there are questions can be asked in the comments column Okay, next we will discuss about animal growth and development this video is here first thank you Wassalamualaikum warohmatullohi wabarokatuh
