- How much oxygen is in the human body?
- Why are we made of stardust?
- Who was the first human?
- Which element is highest in human body?
- How was human born?
- Who was the first person on earth?
- Do we have electricity in our body?
- What is the strongest muscle in the human body?
- What gives life to the human body?
- What is the lightest element on earth?
- What are the 25 elements in the human body?
- What are the 78 organs in the human body?
- Who made humans?
- Will humans go extinct?
- Why is it dark in outer space?
- What is the human body made of water?
- Is the human body made of atoms?
- Are humans made from dust?
How much oxygen is in the human body?
Elemental composition listAtomic numberElementAtomic percent8Oxygen246Carbon121Hydrogen627Nitrogen1.155 more rows.
Why are we made of stardust?
Stars are like nuclear reactors. They take a fuel and convert it to something else. Hydrogen is formed into helium, and helium is built into carbon, nitrogen and oxygen, iron and sulfur—everything we’re made of. … So most of the material that we’re made of comes out of dying stars, or stars that died in explosions.
Who was the first human?
Homo habilisThe First Humans One of the earliest known humans is Homo habilis, or “handy man,” who lived about 2.4 million to 1.4 million years ago in Eastern and Southern Africa.
Which element is highest in human body?
Nitrogen – 2.4kg The four most abundant elements in the human body – hydrogen, oxygen, carbon and nitrogen – account for more than 99 per cent of the atoms inside you.
How was human born?
The first human ancestors appeared between five million and seven million years ago, probably when some apelike creatures in Africa began to walk habitually on two legs. They were flaking crude stone tools by 2.5 million years ago. Then some of them spread from Africa into Asia and Europe after two million years ago.
Who was the first person on earth?
AdamBiblical Adam (man, mankind) is created from adamah (earth), and Genesis 1–8 makes considerable play of the bond between them, for Adam is estranged from the earth through his disobedience.
Do we have electricity in our body?
Electricity is everywhere, even in the human body. Our cells are specialized to conduct electrical currents. … The elements in our bodies, like sodium, potassium, calcium, and magnesium, have a specific electrical charge. Almost all of our cells can use these charged elements, called ions, to generate electricity.
What is the strongest muscle in the human body?
masseterThe strongest muscle based on its weight is the masseter. With all muscles of the jaw working together it can close the teeth with a force as great as 55 pounds (25 kilograms) on the incisors or 200 pounds (90.7 kilograms) on the molars. The uterus sits in the lower pelvic region.
What gives life to the human body?
The unique qualities and properties of water are what make it so important and basic to life. The cells in our bodies are full of water.
What is the lightest element on earth?
HydrogenThe lightest chemical element is Hydrogen and the heaviest is Hassium. The unity for atomic mass is gram per mol.
What are the 25 elements in the human body?
Function of Elements in the BodyOxygen (O) – 65% of body weight.Carbon (C) – 18% of body weight.Hydrogen (H) – 10% of body weight.Nitrogen (N) – 3% of body weight.Calcium (Ca) – 1.4% of body weight.Phosphorus (P) – 1% of body weight.Potassium (K) – 0.25%Sulfur (S) – 0.25%More items…•
What are the 78 organs in the human body?
Among these 78 organs, five organs are considered as vital for survival. These include the heart, brain, kidneys, liver and lungs….Types of Organs in a Human Body.Adrenal GlandsBladderHeartKidneysPancreasPharynxThymus GlandTongueTestesSeminal vesicles13 more columns
Who made humans?
About 1.9 million years ago, Homo erectus evolved. This human ancestor not only walked fully upright, but had much larger brains than Homo habilis: nearly twice as large, on average. Homo erectus became the first direct human ancestor to leave Africa, and the first to display evidence of using fire.
Will humans go extinct?
The short answer is yes. The fossil record shows everything goes extinct, eventually. Almost all species that ever lived, over 99.9%, are extinct. … Humans are inevitably heading for extinction.
Why is it dark in outer space?
The daytime sky is blue because light from the nearby Sun hits molecules in the Earth’s atmosphere and scatters off in all directions. … At night, when that part of Earth is facing away from the Sun, space looks black because there is no nearby bright source of light, like the Sun, to be scattered.
What is the human body made of water?
Up to 60% of the human adult body is water. According to H.H. Mitchell, Journal of Biological Chemistry 158, the brain and heart are composed of 73% water, and the lungs are about 83% water. The skin contains 64% water, muscles and kidneys are 79%, and even the bones are watery: 31%.
Is the human body made of atoms?
About 99 percent of your body is made up of atoms of hydrogen, carbon, nitrogen and oxygen. You also contain much smaller amounts of the other elements that are essential for life.
Are humans made from dust?
Planetary scientist and stardust expert Dr Ashley King explains. ‘It is totally 100% true: nearly all the elements in the human body were made in a star and many have come through several supernovas. ‘