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27 de oct. de 2020 · Otherwise known as aryl compounds, aromatic compounds abound in the human body. Every nucleotide in our DNA and RNA consists of aromatic molecules. Histidine is sometimes incorrectly listed within the aromatic group. Its amino groups may be aromatic-like but they are reactive with a weak positive charge and hydrophilic characteristics.
24 de feb. de 2020 · Most of the human body is made up of water, H 2 O, with bone cells being comprised of 31% water and the lungs 83%. Therefore, it isn't surprising that most of a human body's mass is oxygen. Carbon, the basic unit for organic molecules, comes in second. 96.2% of the mass of the human body is made up of just four elements: oxygen, carbon, hydrogen, and nitrogen.
24 de oct. de 2016 · An adult human body is made up of about 7 octillion atoms. [18] The fastest muscles in a human body are the ones that make the eyes blink. They can contract in less than one-hundredth of a second. In just one day, a person may blink their eyes over 11,500 times. [18] The word “muscle” is from the Latin word musculus, or “little mouse.”
28 de may. de 2024 · Human muscle system, the muscles of the human body that work the skeletal system, that are under voluntary control, and that are concerned with movement, posture, and balance. Broadly considered, human muscle—like the muscles of all vertebrates—is often divided into striated muscle, smooth muscle, and cardiac muscle.
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2 de dic. de 2019 · Oxygen is the most abundant element in the human body accounting for approximately 65% of a person's mass. Each water molecule consists of two hydrogen atoms bonded to one oxygen atom, but the mass of each oxygen atom is much higher than the combined mass of the hydrogen. In addition to being a component of water, oxygen is essential for cellular respiration.
In-depth resources on the workings of the human body, including information on the nervous system, the cardiovascular system, the immune system, and more.
