5 Levels of Organization

Multicellular Organisms Benefits: Larger sized organism Longer life span Specialized cells

Structure and Function Structure is the arrangement of parts in an organism. Ex. Digestive System Function is the job the part does.

5 Levels of Organization Cells Tissues Organs Organ Systems Organism

Cells Cells are the smallest level of organization in living things.

Tissue Cells work together to form Tissue. There are 4 types of tissue in your body: Connective (bone, blood) Nerve Epithelial (skin, linings) Muscle

Organ Tissues work together to perform a job form an Organ.

Organ System Organs work together to form an Organ System You have 11 organ systems in your body.

Organism All systems work together to form the organism. .

Organ Systems Integumentary system facts: Skin is the largest organ in your body. Skin is 16% of your body weight You completely replace your skin cells about once per month. About 90% of dust in your house is dead skin cells. Hair is the fastest growing organ in the body Average #s of hairs: redheads= 80,000 Brown/black = 100,000 Blondes = 120,000 Fingernails grow faster during the summer and on your dominant hand.

Organ Systems 2- Muscular system The muscular system allows us to move Biceps, triceps, hamstring, and quadriceps, are all organs in the muscular system.

Organ Systems 3- Skeletal system The skeletal system provides support and protection for vital organs. Bones, ligaments, and tendons are some organs that make up a skeletal system.

Organ Systems 4- Nervous system The nervous system sends messages that control body functions The brain, spinal cord, and nerves are some organs in the nervous system.

Organ Systems 5- Endocrine System The endocrine system produces chemicals that control the body (ex. Hormones) The adrenal glands, pituitary gland (in brain), thyroid, and pancreas are all organs in the endocrine system.

Organ Systems 6- Cardiovascular system (circulatory) The cardiovascular system carries food and oxygen to the cells, and carries carbon dioxide away from the cells. Your heart, arteries, veins, and capillaries, are organs in the cardiovascular system.

Organ Systems 7- Lymphatic system (Immune system) The lymphatic system returns leaked fluids to blood vessels, and helps fight off germs. Lymph nodes, lymph vessels, thymus, spleen, and tonsils are all organs in the lymphatic system.

Organ Systems 8- Respiratory system The respiratory system exchanges oxygen for carbon dioxide. (O2 in and CO2 out). Lungs, Bronchi, trachea, and diaphragm are all organs in the respiratory system.

Organ Systems 9- Digestive System The digestive system breaks food down into nutrients that can be absorbed by the body. The mouth, liver, stomach, and intestines are some of the organs in the digestive system.

Organ Systems 10- Urinary System (excretory) The urinary system removes waste from the blood and regulates body fluids. Kidneys, ureters, and the bladder are all organs in the urinary system.

Organ Systems 11- Reproductive system The reproductive system enables the organism to produce offspring Ovaries and uterus in a female and testes in a male are organs in the reproductive system.

Quiz time! Which level of organization do each of the following pictures belong to?

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