Tissue
- is a cellular organizational level intermediate between cells and a complete organism
- a tissue is an ensemble of cells
kinds of tissue
- Ephitelium - Tissues composed of layers of cells that cover organ surfaces such as surface of the skin and inner lining of digestive tract: the tissues that serve for protection, secretion, and absorption.
- Connective tissue - As the name suggests, connective tissue holds everything together. Connective tissue is characterized by the separation of the cells by non-living material, which is called extracellular matrix. Bone and blood are connective tissues.
- Muscle tissue - Muscle cells are the contractile tissue of the body. Its function is to produce force and cause motion, either locomotion or movement within internal organs. Muscle tissue is separated into three distinct categories: visceral or smooth muscle, which is found in the inner linings of organs; skeletal muscle, which is found attached to bone in order for mobility to take place; and cardiac muscle which is found in the heart.
- Nervous tissue - Cells forming the brain, spinal cord and peripheral nervous system.
Skeletal Sytem- it serves as framework for the body
- the skeleton provides mechanical protection for many of the body's internal organs
- bone tissues store several minerals
- the red bone marrow inside some larger bones blood cells are produced
Kinds of bones
- Long bones- have greater length than width and consist of a shaft and a variable number of endings
- Short bones- are roughly cube-shaped and have approximately equal length and width
- Flat bones- have a thin shape/structure and provide considerable mechanical protection and extensive surfaces for muscle attachments
- Irregular bones- their shapes are due to the functions they fulfill within the body e.g. providing major mechanical support for the body yet also protecting the spinal cord
Kinds of bone tissue
- Compact- tissue forms the outer shell of bones. It consists of a very hard (virtually solid) mass of bony tissue arranged in concentric layers (Haversian systems)
- Spongy- tissue is located beneath the compact bone and consists of a meshwork of bony bars (trabeculae) with many interconnecting spaces containing bone marrow.
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