The Human Body-Levels of Structural Organization Organ System Overview Integumentary (skin) Forms the external body covering Protects deeper tissue from.

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Presentation transcript:

The Human Body-Levels of Structural Organization Organ System Overview Integumentary (skin) Forms the external body covering Protects deeper tissue from injury Helps regulate body temperature Location of cutaneous nerve receptors

Skeletal Protects and supports body organs Provides muscle attachment for movement Site of blood cell formation Stores minerals

Muscular Produces movement Maintains posture Produces heat

Nervous Fast-acting control system Responds to internal and external change Activates muscles and glands

Endocrine Secretes regulatory hormones Growth Reproduction Metabolism

Cardiovascular Transports materials in body via blood pumped by heart Oxygen Carbon dioxide Nutrients Wastes

Lymphatic Returns fluids to blood vessels Cleanses the blood Involved in immunity

Respiratory Keeps blood supplied with oxygen Removes carbon dioxide

Digestive Breaks down food Allows for nutrient absorption into blood Eliminates indigestible material

Urinary Eliminates nitrogenous wastes Maintains acid-base balance Regulates water and electrolytes

Reproductive Produces offspring

Necessary Life Functions Maintain boundaries Movement Locomotion Movement of substances Responsiveness Ability to sense changes and react Digestion Break-down and absorption of nutrients

Necessary Life Functions Metabolism—chemical reactions within the body Produces energy Makes body structures Excretion Eliminates waste from metabolic

Necessary Life Functions Reproduction Produces future generation Growth Increases cell size and number of cells

Needed for survival Nutrients Chemicals for energy and cell building Includes carbohydrates, proteins, lipids, vitamins, and minerals Oxygen Required for chemical reactions Water 60–80% of body weight Provides for metabolic reaction Stable body temperature Atmospheric pressure Must be appropriate

Interrelationships Among Body Systems Homeostasis—maintenance of a stable internal environment A dynamic state of equilibrium Homeostasis is necessary for normal body functioning and to sustain life Homeostatic imbalance A disturbance in homeostasis resulting in disease

Homeostasis Homeostasis—maintenance of a stable internal environment A dynamic state of equilibrium Homeostasis is necessary for normal body functioning and to sustain life Homeostatic imbalance A disturbance in homeostasis resulting in disease

Homeostasis cont: The body communicates through neural and hormonal control systems Receptor Responds to changes in the environment (stimuli) Sends information to control center

Homeostasis cont: Control center Determines set point Analyzes information Determines appropriate response Effector Provides a means for response to the stimulus

Feedback Mechanism Negative feedback Includes most homeostatic control mechanisms Shuts off the original stimulus, or reduces its intensity Works like a household thermostat Positive feedback Increases the original stimulus to push the variable farther In the body this only occurs in blood clotting and during the birth of a baby