Tissue on Animals

1. Epithelium tissue
Epithelium tissue is a network that coats the surface of the organs of the body outside and inside. Based on the number of layers and cell morphology, the epithelial tissue is divided into two:

a. Single-layered epithelium, the epithelium tissue comprising only one cell layer.
b. Multilayered epithelium, the epitheliuml tissue composed of many layers of cells.
Example:
- Flat epithelium tissue in the nasal cavity, mouth and skin surface.
- Cylindrical epithelium  tissue present in the eye conjunctiva
- Cubed epithelium tissue in the ovary wall.
2. Muscle tissue
Muscle tissue acts as an active motion in humans and animals. If this tissue gets stimulated, it will contract or relax to produce movement in the bone. Muscle tissue is elastic, can receive stimulation, can contract (its size shortens and becomes hard) and also relax (the size is elongated and soft).

There are three types of muscle tissue in animals.
a. Plain muscle tissue
This tissue is present in the internal organs such as the intestines, excretion channels, and blood vessels. The smooth muscle works involuntarily (working unconsciously).

b. Skeletal muscle tissue
This network is attached to the frame and works according to the will (voluntary). Skeletal muscle tissue can receive stimulation to move the framework so that humans and animals can move actively.

c. Heart muscle tissue
Cardiac muscle tissue is found only in human and animal heart organs. This network works beyond human consciousness or will. Heart muscle tissue contracts rhythmically and quickly but not easily tired.

3. Supporting / Connective tissue
In general, animal support networks function as follows:
a. Connecting one tissue to another tissue.
b. Bind, attach or connect multiple organs.
c. Filling and supporting the body.

The types of connective tissue

  1. Solid connective tissue: this tissue is composed of collagen fibers and elastin fibers. Many are found in the tendons, ligaments, and fascia.
  2. Loose connective tissue: Composed of fibroblasts, plasma cells, macrophages, white blood cells, collagen and elastin fibers. There are many in the blood vessels, under the skin and around the organs of the body.
  3. Fatty tissue (adipose): Composed of fat cells that are thin-walled cells. There are many under the skin, around the kidneys, joints and bone puncture.
  4. Hard bone tissue: Composed of osteocytes cells within the lacuna. This network is hard and not rigid. This is because the matrix contains calcium carbonate and calcium phosphate.
  5. Cartilage tissue (cartilage): Composed of condominium cells located within the lacuna. The matrix is elastic because it is filled with cells that contain collagen. Cartilage tissue can be found in the earlobes, discs between the vertebrae, trachea, joints, and nose bone end.
  6. Blood tissue: Composed of red blood cells (erythrocytes), white blood cells (leukocytes) and platelets. All of these cells are present in the blood plasma. Blood tissue can be found in all parts of the animal and human body.
  7. Lymph tissue: Composed of lymphocyte and granulocyte cells. These cells are in the lymph fluid.

4. Nerve Tissue 
The neural network is composed of nerve cells called neurons. In general, the function of the neural network is to deliver impulses from and toward the brain.

Neuron cells have the following parts:
1. Dendrites: serves to receive an impulse and deliver it to the cell body.
2. Cell body
3. Schwann sheath.
4. Myelin sheath
5. Axons: serves to deliver impulses to other neuron cells.
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