1. Human Body Systems Group #3 - Homeostasis
The Excretory System
The Lymphatic System
The Immune System

2. 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

3. 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

4. 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)

5. 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

6. 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

7. The Lymphatic System - Structures
Cells – white blood cells
Tissues – connective tissue
Organs
lymph nodes such as tonsils, spleen, adenoids, thymus

8. 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

9. 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

10. 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

11. The Immune System – Structures
Cells – white blood cells
Tissues – epithelial and connective tissue
Organs - blood vessels and lymph nodes

12. 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

13. 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