Cutting human organs: features

Everyone knows that due to the presence of muscle tissue, it is possible to move the human body and its individual parts in space. But in our body there are still cutting organs. All of them perform irreplaceable functions for normal functioning.

What are organs

First, let's see what the organ is all about. This part of the body, which occupies a certain position, has a characteristic structure and performs one or several functions. A very important feature of any organ is that several tissues are included in its composition.

In total, there are four of them in the human body: epithelial, connective, muscular and nervous. All of them are formed by cells that are similar in structure and function.

The contracting organs of man

The composition of contracting organs necessarily includes muscle tissue or cells that are close to it by properties. For example, collagen fibers are located in the skin. Thanks to this structure, it is capable of stretching and does not interfere with the implementation of various movements. All cutting organs can change their volume and length, and then return to the standard state.

Features of the structure of muscle tissue

Muscle tissue consists of individual contractile fibers, which are called myofibrils. The latter are formed by the filaments of special proteins, actin and myosin. Between each other they are connected by means of transverse bridges. Nerve impulses excite muscle fibers, and they begin to contract. The essence of this process is that threads of actin with the help of transverse bridges are drawn between the myoson. The length of the muscle fiber is reduced.

Defined muscle tissue

There are several types of muscle tissue. What cutting organs form a striated or striated tissue? These are mimic and skeletal muscles, diaphragm, larynx, tongue, upper part of esophagus. The fibers of this type of fabric are long and multi-core. Under a microscope they look like alternating dark and light strips.

The delineated muscle tissue is characterized by a high rate of contraction and relaxation, which are realized consciously. After all, man himself controls the movement of the limbs and changes the facial expression.

Cardiac muscle tissue

The heart is a special organ. He is constantly at work, because the life of a person depends on the frequency of his contractions. Therefore, this organ is formed and a special kind of striated tissue, which is called - cardiac. It has special areas in which individual fibers are interlocked. This structure ensures a simultaneous reduction of the whole organ. Conduction is a very important property of the cardiac muscle. It consists in spreading the excitement that has arisen in one area, throughout the body. In special cells of the heart periodically there are impulses that spread throughout the heart muscle and regulate the rhythm of its contractions. This property is called automatism.

Unclear muscle tissue

Internal cutting organs mainly consist of smooth, or undistorted tissue. This is the gastrointestinal tract, bladder, bronchi and lungs, the walls of the blood and lymphatic vessels. Spindle-shaped cells of smooth tissue are mononuclear and under a light microscope look homogeneous. Their characteristic sign is a rather slow contraction and relaxation. Their activity is involuntary and does not depend on the will of man. For example, we can not stop contractions of the stomach or intestines.

So, the contracting human organs have in their structure one of the types of muscle tissue. The coordinated automatic work of the heart is ensured by a special type of striated fibers. Smooth muscle tissue contracts slowly and involuntarily, forming the walls of internal organs. Movement of the body and its individual parts is provided by striated fibers. They shrink quickly and are controlled by humans.