The animal body structure is formed by various cellular, tissue, chemical, and organ components. These components in a group form a level of organization in the body of an organism. Various levels of organization in increasing order are- chemical, cellular, tissue, organ, system, and organism levels. Comparative anatomy is the study of differences or similarities in the anatomy or structures of different animals. The structures of different animals that resemble each other in structure but have different functions are homologous. Their common anatomy could be due to the common ancestry that they shared before. But these structures do not have the same functions as they have evolved or adapted in time. So, these structures have the same anatomy but have different functions. Organs in animals can be defined as recognizable structures that carry out various functions in their body. In general, animal organs are composed of more than one kind of cell type. Some examples of organs are the eyes, lungs, and heart.
It forms a protective covering for an organ. It facilitates osmosis, filtration, and diffusion.
These tissues are located in alveolar and capillary walls and the lining of lymph and blood vessels.
The cells are cuboidal in shape. It facilitates absorption and secretion.
It is present in the collecting tubule of the kidney and the lining of bronchioles.
The cells are columnar. It forms a protective covering for an organ.
It is present in the lining of the gastrointestinal tract.
The cells can be columnar or cuboidal but they have cilia on them.
It is present in the upper respiratory tract and the fallopian tubule, where they allow movement of mucus, ovum, and other substances.
This type of epithelium can change the shape of its cell according to requirements.
It is present in the urinary bladder and ureters.
Connective tissues connect, support, and separate the other tissue types in the body. The connective tissues are composed and surrounded by extracellular matrix protein (ECM-proteins), which is liquid.
There are three types of connective tissues in the body: fibrous connective tissues, supportive connective tissues, and fluid connective tissues.
All three types of connective tissues comprise three main components: ground substances, protein fibers, and specialized cells.
Connective tissue proper:
It is commonly found in the skin, tendons, ligaments, and fatty tissues. There are many types of cells present, such as the connective tissue proper, and they are present inside the matrix.
Connective tissue proper includes loose and dense connective tissues.
Fluid connective tissues:
These constitute the blood and lymph. They are made up of distinct cell types, which are suspended in the matrix. The matrix is the watery ground substance that includes dissolved proteins.
Hematopoietic tissue forms blood cells. This tissue is found in the bone marrow, which is the soft connective tissue in the bone cavities.
Supporting connective tissue:
They have a dense matrix and the fibers are closely packed. There are two types of supporting connective tissues, namely, bone and cartilage.
Cartilage is made up of cartilage cells within a relative and extensively rigid matrix. Bone is a hard tissue made up of mineralized matrix and living cells.
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