How is the man?
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Science has long been collecting bits and pieces of knowledge about how a person works. Anatomy studies the shape and structure of the human body, which is subject to changes over time (historical process, individual characteristics), space (on planet Earth) and under the influence of other factors (climatic, environmental, social, etc.).
How does a man? There are external and internal structure of the human body. The external structure is understood to be visible parts of our body, such as the head, torso, arms and legs. As for the internal structure, it is worth mentioning the most elementary unit with which the life of any organism begins - the living cell. A cell is a small lump of protoplasm with a nucleus, a complexly organized living system. It has its own metabolism, capable of self-reproduction, development, independent existence.
The structure of bones and joints
Did you know that the skeleton of a newborn baby consists of 350 bones? And the skeleton of an adult holds 206 bones.The secret is that the skeleton of a newborn is more mobile, which makes it easy to be born, and over time, some bones grow together. The skeleton is divided into two groups: extension and axial. Axial skeleton - chest, skull and spine. Additional - the belt of the upper and lower limbs, upper and lower limbs. There are no major differences between the male and female skeletons, with the exception of the bones of the fingers and limbs, which are longer and thicker in men.
Muscles consist of elastic and elastic muscle tissue, which is able to contract under the influence of various factors. Thanks to the muscles, we can express our emotions, put our thoughts into action. The work of muscle tissue is controlled by the human nervous system. There are three types of muscles: skeletal, smooth and heart. The human body contains up to 850 muscles, the most voluminous - the buttock, and the strongest and strongest - calf and chewing. Proper lifestyle, sports, the absence of bad habits contributes to the active development of the muscular system.
This system combines the human endocrine glands, which regulate the activity, development and condition of the internal organs with the help of hormones.It is also paired with the nervous system and is able to regulate the emotional and mental state of a person. The endocrine system consists of glandular and diffuse systems. The main place in the endocrine system is the thyroid gland, which is on the protection of the organism as a whole. Through the thyroid gland all the blood circulates (17 minutes - a full cycle). Iodine secreted from the gland destroys unstable microorganisms, weakens the effect of viruses until fully neutralized.
The nervous system of the human body is divided into the central (CNS) and peripheral (PNS) nervous systems. The main functional element of the nervous system is nerve cells, neurons. The brain and spinal cord are components of the central nervous system, which is connected to all tissues and organs through the peripheral nervous system (PNS). Nerves, nerve nodes and nerve endings are components of the PNS. Interestingly, the human body contains up to 100 billion nerve cells, the brain spends about 10 watts of energy, and in 1 minute it flows up to 750 ml of blood. Nerve cells process about a thousand impulses per second. The nervous system regulates the relationship of the body with the environment, ensures the functioning of mental processes that are responsible for thinking, remembering and learning.
The circulatory system is represented by a group of organs that are necessary for blood circulation. The central and main mechanism of the circulatory system is the pulsating organ - the heart. Blood circulation involves the transfer of oxygen, nutrients, salts, hormones and other substances to all organs of the body. The circulatory system consists of the heart and a variety of channels (vessels) that transport blood to all vital organs. Channels (vessels) are divided into three types: arteries, capillaries and veins. Arteries carry blood from the heart, branch out into vessels (of smaller diameter), and blood flows to all parts of the body. The largest diameter arteries have near the heart. In parts of the body distant from the heart, the vessels are so small that they are visible only under a microscope. It is these inconspicuous capillaries that supply cells with oxygen and nutrients. After the delivery of oxygen and nutrients, blood with metabolic end products and carbon dioxide is sent to the heart through the veins, and from the heart to the lungs, where gas exchange takes place. As a result of this gas exchange, the blood gets rid of carbon dioxide and is saturated with oxygen.
The internal organs of a person can be divided into two sections - upper and lower.The upper section is the chest cavity, located behind the ribs and above the diaphragm. Here are the heart and lungs. The lower part is the abdominal cavity in which the intestines, kidneys, liver, pancreas, bladder, spleen, gall bladder, stomach and other organs are located.
The human body is a perfect creation of nature with a complex mechanism.