Human body structure diagram

The basic structure of human anatomy is the somatic cell, and there is a non-cellular structure in the somatic cell, which is called the interstitial matrix. The cell structure can be divided into three parts: cytoplasm, nucleus and cytoplasm. Epithelial cell tissue is divided into three categories: covering epithelial cells, glandular epithelial cells, and sensory epithelial cells. The key difference between men and women in the human body structure diagram depends on the male reproductive organs, and there is no difference in other aspects.

1. Blood

The total blood volume of the body is 8% of body weight. If you lose more than 20% of your blood volume at one time, your life will be hindered. For healthy people, if you lose no more than 10% of your blood at one time, you can usually recover quickly.

2. Muscles

There are about 639 muscles in the human body. It is composed of about 6 billion muscle tissues, the largest of which is 60 cm long and the smallest is only about 1 mm. A block of muscle weighs 2000 kg, and a small piece of muscle weighs only 100 kg. Muscles account for 35%-40% of the average person's body weight. The total length of capillaries in muscles reaches more than 100,000 kilometers, which can circle the earth several and a half times.

3. Bones

Bones are hard tissues in the body or skin of humans or animals. There are two types: the skeleton of humans and higher animals is inside the body, composed of many bones, called the endoskeleton; the shell outside the body of arthropods and mollusks, as well as the scales and shells on the skin of some vertebrates (such as fish, turtles, etc.) are called exoskeletons. The skeleton generally refers to the endoskeleton. Bones are hard organs that make up the endoskeleton of vertebrates. Their functions are to move, adapt and maintain the body; produce red blood cells and white blood cells; store minerals. Bones are composed of various different shapes, with complex properties and external structures, which allow bones to maintain hardness while relieving weight. One of the components of bones is mineralized bone tissue, which has a hard honeycomb-like three-dimensional structure inside; other tissues include bone marrow, periosteum, nerves, blood vessels and cartilage. The bones of the body play a role in supporting the human body and are part of the body's endocrine system. An adult has 206 bones. Bones are generally connected to each other by joints and tendons.

4. The Human Brain

The human brain is composed of about 14 billion cells and weighs about 1,400 grams. The thickness of the cerebral cortex is about 2-3mm and the floor area is about 2,200 cubic centimeters. According to statistics, 1,000 to 100,000 brain neurons die every day (the less you use your brain, the more brain cells die). The capacity of a person's brain to store information is equal to a public library with 1,000 books. Even the most brain-savvy person only uses 10% of his brain's capacity in his lifetime. The main component of the human brain is water, accounting for 80%. Although it only accounts for 2% of the body weight, it consumes 25% of the body's oxygen consumption, and its blood volume accounts for 15% of the heart's blood transfusion. The blood that flows through the human brain in a day is 2,000 liters. The energy consumed by the human brain is roughly equal to 25 watts if expressed in terms of rated power.