TISSUE

          The term tissue refers to a group of similar cells. Being made up of a combination of the same cells, a tissue has the same function in any part of the body. The union between tissues shapes the different organs.

          On the basis of their physical structure and the function they perform, the tissues are divided into 4 classifications:

• Epithelial tissue
• Connective tissue
• Muscle tissue
• Nervous tissue

Nervous Tissue

          The nervous tissue captures, transmits and interprets the information that reaches the body. It is made up of neurons and supporting cells.

          Neurons. Elongated cells that receive stimuli and transmit them as electrical impulses to other neurons or other types of cells. They have the ability to communicate accurately, quickly, and at long distances with other cells, be they nerve, muscle, or glandular. Neurons are the operating units of nervous tissue. The set of dendrites and axons. It is called nerve fiber. The nerves are made up of a group of nerve fibers. Neurons, unlike most cells in the body, do not have the ability to reproduce during maturity.

Cellular body or soma. It contains the nucleus and organelles of the neuron. Terminal tree planting. They are ramifications of the axon. It transmits the information to other neurins. Mielina. Covers the axon. It is made up of proteins and lipids. It allows the rapid transmission of impulses throughout the neuron.

Axon. It is an extension of the cytoplasm. It carries the nerve impulse from the cell body to other cells. Dendrites. They are short cytoplasmic extensions that receive stimuli from other neurons and carry them to soma.

          Support cells. It is in contact with neurons. They are of two types: neuroglia cells, which protect and feed the neurons, and microglia cells, which have a defensive function, as they phagocytize substances and microorganisms harmful to the Central Nervous System (CNS).

Types Of Nerves

          According to their function, three types of nerves are distinguished:

• Sensory. They receive information from the rest of the body and take it to the CNS.
• Engines. They transport the responses from the CNS to the respective organs.
• Mixed. They transmit messages within the SNC. The specialized junctions by which neurons send signals to each other are called synapses.

Muscle tissue

Muscle tissue participates in the production of movement. Its elongated cells, called muscle fibers, contract and relax in response to nerve stimuli. A set of muscle fibers forms a muscle bundle. Several beams create a muscle.

The bones and joints provide the body with a system of levers and support the body. However, they cannot move by themselves. Movement results from the contraction and relaxation of muscles. The muscle fibers are made up of filaments of the actin and myosin proteins, responsible for contraction.

Cardiac	Skeletal	Smooth
Its cells are striated, mononucleated (they have a single nucleus) and branched. Its contraction is involuntary. It forms the heart.	Its cells are cylindrical, elongated and multinucleated (they have more than one nucleus). It has stretch marks. You can contract and relax voluntarily. It is inserted into the bones.	Its cells are cylindrical, elongated and multinucleated (they have more than one nucleus). It has stretch marks. You can contract and relax voluntarily. It is inserted into the bones.

Fabrics: types and functions

What are tissues?