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Human Body Systems
Group #3 - Homeostasis
THE EXCRETORY SYSTEM
THE LYMPHATIC SYSTEM
THE IMMUNE SYSTEM
The Excretory System - Functions
•Metabolism is all of the chemical activities that help
the organism survive
•The body needs to balance water, salt, and other
chemicals to maintain the functions of all systems
•Wastes are generated through metabolism (chemical
reactions)
•Excretion gets rids of the wastes
The Excretory System - Structures
•Cells – nephrons filter the blood
•Tissues - epithelial & muscular tissue
•Organs
• kidneys – are made of nephrons filter the blood
• bladder – stores urine
• large intestine – digestive wastes
• lungs – exhale carbon dioxide & water
• skin – sweat releases water, salt & chemicals
The Excretory System - Interactions
•Urinary System
filters the blood and releases liquid wastes (urine)
•Digestive System
• collects undigested materials and releases them as solid wastes
(feces)
•Respiratory System
• collects and releases carbon dioxide and water
•Integumentary System (Skin)
• releases wastes through sweating (salt, water & other
chemicals)
The Excretory System - Interactions
•Cardiovascular System (Circulatory System)
•blood carries wastes to locations of disposal
•For example…
• carbon dioxide is carried back to the lungs for exhaling
• blood is pumped to the kidneys for filtering
The Lymphatic System - Functions
•Provides protection from pathogens (germs and
other foreign substances that enter/invade the
body)
•Transport wastes through fluids OUTSIDE of the
circulatory system (a clear fluid, not blood)
•Controlled by movements of the skeletal muscles
The Lymphatic System - Structures
•Cells – white blood cells
•Tissues – connective tissue
•Organs
• lymph nodes such as tonsils, spleen, adenoids, thymus
The Lymphatic System - Interactions
•Skeletal & Muscular Systems
• voluntary movement causes lymph to circulate
•Digestive System
• spleen captures and destroys pathogens
•Respiratory
• tonsils capture and destroy pathogens
The Lymphatic System - Interactions
•Excretory System
• helps get rid of wastes
•Immune System
• white blood cells fight pathogens
•Nervous & Senses
• helps to move cerebrospinal fluid
•Endocrine
• thymus glands produce T-cells that help fight disease
The Immune System – Functions
•Protects the body against invaders/pathogens such as…
• viruses
• bacteria
• parasites
• fungi
•Produces antibodies
• to fights pathogens now
• to recognize pathogens in the future
The Immune System – Structures
•Cells – white blood cells
•Tissues – epithelial and connective tissue
•Organs - blood vessels and lymph nodes
The Immune System – Interactions
•Skeletal – bone marrow produces white blood cells
•Muscular - voluntary movement causes lymph to circulate
•Integumentary (Skin) – skin blocks pathogens from entering body
•Digestion – hydrochloric acid in the stomach kills bacteria in food
•Respiratory
• cilia and mucus trap pathogens
• sneezing and coughing expel pathogens from body
•Cardiovascular – transport white blood cells to the immune system
The Immune System – Interactions
•Excretory – helps get rid of wastes
•Lymphatic – thymus and spleen produce white blood cells
•Nervous - cerebrospinal fluid helps protect the brain
•Endocrine – gland control release of hormones that trigger
immune responses