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Principle of Complementarity

function always reflects structure

Levels of Structural Organization

Chemical, Cellular, Tissue, Organ, Organ System, Organismal

Integumentary System

skin, sweat glands, oil glands, hair, and nails

Skeletal System

bone, cartilage, and ligaments

Muscular System

muscles and tendons

Nervous System

brain, spinal column, and nerves

Cardiovascular System

heart and blood vessels

Lymphatic System

bone marrow, thymus, spleen, lymph nodes, and lymphatic vessels

Respiratory System

nasal cavity, pharynx, trachea, bronchi, and lungs



Negative Feedback

shut-off of output (to achieve homeostasis; some variable is out of balance and is brought back into balance)

Positive Feedback

out increased to reach a set point (blood clotting, childbirth)

homeostatic mechanism parts

receptor, control center, and effector

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