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Organ Systems
Teamwork
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Nervous
Digestive
Integumentary
Respiratory
Skeletal
Muscular
Excretory
Circulatory
Endocrine
Reproductive
Lymphatic
11 Systems in the Human Body…
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Nervous System
Structures: Brain, spinal cord, and peripheral nerves
Function: Coordinates the body’s response to changes in its internal and external environments
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Digestive System
Structures: Mouth, pharynx, esophagus, stomach, small intestines and large intestines
Function: Converts foods into simpler molecules that can be used by the cells of the body; absorbs food
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The digestive system does not work without the help of other organ systems.
The digestive system needs the cardiovascular system to deliver the nutrients to other organs in the body such as the muscles and the brain.
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Circulatory System
Structure: Heart, blood vessels, and blood
Function: Brings oxygen, nutrients, and hormones to cells; fights infections; and regulates body temperature
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Respiratory System
Structures: Nose, pharynx, larynx, trachea, bronchi, bronchioles, and lungs
Function: Provides oxygen needed for cellular respiration and removes excess carbon dioxide from the body
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The circulatory system depends on the pulmonary system (lungs) to deliver oxygen to muscles and other organs.
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Skeletal System
Structures: Bones, cartilage, ligaments, and tendons
Function: Supports the body; protects internal organs; allows movement; stores mineral reserves; and provides a site for blood cell formation
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Muscular System
Structures: Skeletal muscle, smooth muscle, and cardiac muscle
Function: Works with skeletal system to produce voluntary movement; helps to circulate blood and move food through the digestive system
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Muscles and bones work together to produce movement.
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Excretory System
Structures: Skin, lungs, kidneys, ureters, urinary bladder, and urethra
Function: Eliminates waste products of metabolism from the body and maintains homeostasis
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Integumentary System
Structure: Skin, sweat and oil glands, hair, and nails
Function: Serves as a barrier against infection and injury; helps to regulate body temperature; and provides protection against ultraviolet radiation from the sun
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Lymphatic System
Structures: White blood cells, thymus, spleen, lymph nodes, and lymph vessels
Function: Help protect the body from disease; collects fluid lost from blood vessels and returns the fluid to the circulatory system
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Getting rid of waste is another necessary function of the body:
•Lungs get rid of carbon dioxide.
•Lymphatic vessels recycle extra fluids that build-up next to cells and tissues.
• Kidneys filter the blood of toxins.
• Skin releases excess salts through sweat.
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Endocrine System
Structures: Hypothalamus, pituitary gland, thyroid, parathyroid, adrenals, pancreas, ovaries (female), and testes (male)
Function: Controls growth, development, metabolism and reproduction
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Reproductive System
Structures: Testes, epididymis, vas deferens, urethra, and penis (males); ovaries, Fallopian tubes, uterus, and vagina (females)
Function: Produces reproductive cells, in females, nurtures and protects developing embryo
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•Reproduction, growth and development are critical functions of all living things.
•The endocrine system provides the chemical messages for growth, development, and proper functioning of the reproductive system.
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Pancreas Pancreas releases releases insulin insulin
Blood sugar Blood sugar is too lowis too low
Sugar level goes to…Sugar level goes to…
HomeostasisHomeostasis
Pancreas Pancreas releases releases
glucogen glucogen
Sugar level goes to…Sugar level goes to… HomeostasisHomeostasis
Blood sugar Blood sugar is too highis too high
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