What are the organizational structures of the human body and what are the basic tissues of the human

The 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 four major tissues of the human body are: epithelial tissue, connective tissue, muscle tissue, and nerve tissue.

1. Epithelial tissue, also known as epithelium, is an important structure that is lined or covered on other tissues. consists of dense epithelial cells.

and a small amount of interstitial composition. The structure is characterized by tight cell binding and little interstitium. It usually has the functions of protection, absorption, secretion, and excretion. Epithelial tissue can be divided into two categories: overlying epithelium and glandular epithelium. Epithelial tissue is the largest tissue in the human body.

2. Connective tissue is composed of cells and a large number of intercellular fluids, which include matrix, filamentous fibers and interstitial fluid, which are of great functional significance. The cells are scattered within the interstitium of the cells and have no polarity in distribution.

3. The basic tissues of animals composed of specially differentiated muscle cells. There is a small amount of connective tissue between muscle cells, capillaries and nerve fibers. Muscle cells are elongated in shape, so they are also called muscle fibers. Cell membranes of muscle cells.

It is called the sarcosa, and its cytoplasm is called sarcoplasm.

4. Nervous tissue is the nervous system.

The main components are nerve cells and neuroglial. Nerve cells are the structural and functional units of the nervous system, also known as neurons.

The tissue structure of the human body is composed of epithelial tissue, connective tissue, muscle tissue, and nervous tissue.

1 Epithelial tissue, which is composed of densely packed cells with minimal interstitium, including overlying epithelium and glandular epithelium;

2 Connective tissue is made up of cells and a large amount of intercellular stroma. The interstitial cells include a homogeneous matrix and filamentous fibers, and connective tissue includes intrinsic connective tissue, cartilage, bone, blood, lymph, and bone marrow.

3. Muscle tissue is composed of muscle cells and muscle homogenizer, containing a large number of muscle filaments, which can carry out contraction movements, mainly divided into skeletal muscle, cardiac muscle and smooth muscle;

4 Preneural silver tissue is made up of nerve cells and glial cells.

The tissue structure of the human body is composed of epithelial tissue, connective tissue, muscle tissue, and nervous tissue.

1 Epithelial tissue, composed of densely packed cells with minimal interstitium, including overlying epithelium and sail gland epithelium;

2 Connective tissue is made up of cells and a large amount of intercellular stroma. The interstitial cells include a homogeneous matrix and filamentous fibers, and connective tissue includes intrinsic connective tissue, cartilage, bone, blood, lymph, and bone marrow.

3. Muscle tissue is composed of muscle cells and muscle homogenizer, containing a large number of muscle filaments, which can carry out contraction movements, mainly divided into skeletal muscle, cardiac muscle and smooth muscle;

4 Nerve tissue is made up of nerve cells and glial cells.

1. There are four basic tissues of the human body, namely epithelial tissue composed of epithelial cells and a small amount of interstitium; Connective tissue is made up of cells and a large number of intercellular stromium; muscle tissue made up of specially differentiated muscle cells; Nervous tissue made up of nerve cells and glia.

2. The human body is composed of organic matter and inorganic matter, the tissue is composed of cells and interstitium, the organ is composed of tissue, and the organ with similar function is composed of the sliding system, which is composed of eight systems and a human body.