-
Anonymous users2024-02-12(1) Human body profile:
1. Four parts: head, neck, torso, and limbs.
2. Three layers: **, muscles, bones.
-
Anonymous users2024-02-11The book says yes: cells, tissues, organs, systems, individuals, populations, communities, ecosystems, biospheres.
-
Anonymous users2024-02-10Heaven, people, I am a monolithic word structure.
In Chinese characters, there are single character structures and combined character structures. Monolithic characters are composed of a few basic strokes, and these characters have neither radicals, radicals, nor other structures. Such as upper, middle, lower, large, small, this, wood, day, month, don't, field, use, cheng, etc., are all independent words.
Monolithic characters generally have fewer strokes, but the fewer strokes there are, the more difficult it is to write well. Some should be sparse and dense, some should be of appropriate length, some should be appropriate, and some should be mastered.
-
Anonymous users2024-02-09The basic unit of the structure of the human body is the cell. There is a non-cellular structure of material between the cells called the interstitium.
Cells can be divided into three parts: the membrane, the cytoplasm, and the nucleus. The cell membrane is mainly composed of proteins, lipids and sugars, which have the role of protecting the cell, maintaining the stability of the cell, and controlling the exchange of substances inside and outside the cell.
Cytoplasm is the center of cell metabolism and is mainly composed of water, proteins, ribonucleic acids, enzymes, electrolytes, etc. Various organelles are also suspended in the cytoplasm. The main organelles are mitochondria, endoplasmic reticulum, lysosomes, centrosomes, etc.
The nucleus is surrounded by a nuclear membrane that contains nucleolus and chromatin. Chromatin contains nucleic acids and proteins. Nucleic acids are substances that control the heredity of living organisms.
Nerve tissue is made up of neurons and glial cells and is highly sensitive and conductive. Neurons are made up of cell bodies, dendrites, and axons. Dendrites are short, branching like branches, and their function is to transmit impulses to the cell body; The axons are long, terminated in nerve endings, and their function is to transmit impulses outward from the cell body.
Myocardial tissue is made up of muscle cells. Muscle cells have the function of contraction. According to its morphology and function, muscle tissue can be divided into three categories: skeletal muscle, smooth muscle and cardiac muscle.
Connective tissue is made up of cells, interstitium, and fibers. It is characterized by loose cell distribution and more interstitial cells. Connective tissues mainly include:
Loose connective tissue, dense connective tissue, adipose tissue, cartilage, bone, blood and lymph, etc. They have the functions of support, connection, nutrition, defense, repair, etc.
The Belgian physician Vesalius published his book The Structure of the Human Body, challenging Galen's doctrine of the "Trinity". The Spanish physician Servette discovered the small circulatory system of blood, proving that blood flows from the right ventricle to the lungs, through a tortuous route to the left ventricle. Through a large number of animal dissection experiments, the British anatomist Harvey published treatises such as "Theory of Heart and Blood Movement", systematically explaining the laws of blood movement and the working principle of the heart.
He pointed out that the heart is the center and motive force of blood movement. This momentous discovery made him the originator of modern physiology.
Many people may have some misunderstandings about Lu Chong, so once they hear this word, they feel very numb. It is true that a large part of the road rush will bring disaster to their own lives, but this is not the whole story. In fact, there are still better ones in the road rush, just like in some situations, you can make yourself more vigorous. >>>More
In order to be worthy of their ambitions, in order to live up to the sufferings they have suffered. Always remind yourself that life is only wonderful to come out, and there is no glory waiting to come out; So please remember that the harder you work, the luckier you are, otherwise I wouldn't have the opportunity to be his helper, or still be the self who does nothing and does nothing, and thanks to his appearance for making me believe in the luck of hard work.
This person is brave and good at fighting, just like the famous general Dian Wei during the Three Kingdoms period.
The more a woman lacks love, the more she will have the following manifestations, first, pessimistic and negative, like to complain, such a woman is insecure, nagging and complaining, but because of the lack of love, she wants to attract a man's attention, second, she has a strong personality and does not like to trouble others, because their hearts need love more than everyone else, although they are strong on the surface, they are very weak inside, and the reason why they are strong is because she has no one to rely on.
The personality traits of the Gemini man, click in to tell you the answer.