Lesson 3 organization of the human body

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  • 1.Cell-Tissue-Organ-System Cells in multicelullar organisms are grouped together to form more complex structures. Tissue: a set of the same type of cells from the same origin. Organ: a set of tissues that come together to perfom a specific function System: a set of organs, each formed by different tissues, which take part in one or various functions.

2. Specialized cells Cells divide by cellular division in a multicellular organism. One daughter cell specializes and the other maintains the capability of dividing, assuring cellular renovation and the growth of the organism. Most specialized cells lose the ability of dividing. It does a specific job It develops a special shape Changes take place in its cytoplasm. E.i. muscle cells (mitochondria) Specialized cell 3. Highly specialized cell: sperm cell How do the characteristics of this cell help it do its function? ACTIVITY 4. Tissues Tissues perform specific functions because their cells are specialized to carry out certain processes. Different tissues for different functions Movement Communication Protection Secretion Connection Support Reserves 5. Movement: muscle tissue Muscle tissue Skeletal : muscles Cardiac: heart Smooth: Involuntary contractions (stomach) 6. Striated muscular tissue Skeletal Voluntary contractions Makes up the muscles that together with the bone produces movement. 7. Heart Involuntary contractions Makes up the muscle of the heart walls. Striated muscular tissue 8. Smooth muscle tissue Involuntary contractions Makes up the wall of many organs. 9. Communication: nerve tissue Coordinates the function of all the organs The specialized cell is a neuron. 10. Connection: Connective tissues Loose connective tissue: Its the fill-in tissue. It takes up the spaces between organs and other tissues. Bone tissue: basic component of adult bones. It is the strongest type of connective tissue because it contains a mineral called calcium 11. Adipose tissue: accumulates fat in the cells and contains a small amount of fibers. Cartilage tissue: main component of embryonic skeleton. In adults there is cartilage in joints, the traquea, the nose and ears and between discs in the spinal column. Connection: Connective tissues 12. Protection: Epithelial tissue Covers and protects our body as well as our internal cavities. 13. Tissues make Organs 14. Organs make Systems 15. Systems The different systems are responsible for carrying out the 3 vital functions of living organisms. NUTRITION REPRODUCTION REACTION Digestive System Respiratory System Circulatory System Excretory System Reproductive System Sensory Organs Nervous System Endocrine System Muscular and Skeletal