Download Notes: Body Systems

Name: ______________________________
Date: _____________________
Notes: Body Systems
Define homeostasis: _____________________________________________________________
Digestive System
Primary function: _______________________________________________________________
Major organs: esophagus, stomach, small intestine, large intestine
Important Fact:
What are in your intestines that help you digest your food? _____________________________
Respiratory System
Primary function: _______________________________________________________________
Major organs: lungs, trachea, bronchi, diaphragm
Important Facts:
How do the diaphragm and rib cage help you breathe?
______________________________________________________________________________
What tiny air sacs are the lungs filled with? __________________________________________
Why are these sacs covered with blood vessels?
______________________________________________________________________________
Circulatory System
Primary function: _______________________________________________________________
Major organs: heart, blood vessels
Major tissue: blood
Excretory System
Primary function: _______________________________________________________________
Major organs: kidneys, bladder, colon
Important Facts:
What organ filters waste in the blood? ______________________________________________
Where does the kidney send extra water & dissolved wastes? ___________________________
Homeostasis Example:
 The kidneys help regulate water levels in the body. If there is plenty of water, the
kidneys send the extra to the bladder and the urine is almost clear.
 If there is not enough water, the kidneys retain the water in the blood and the urine
becomes concentrated with wastes and a bright yellow color.
Skeletal System
Primary function: _______________________________________________________________
Major organs: bones
Major tissue: bone marrow, ligaments
Important Fact:
What does marrow inside bones create? ____________________________________________
Muscular System
Primary function: _______________________________________________________________
Major organs: muscles
Major tissue: tendons
Important Facts:
What is an example of involuntary movement? _______________________________________
How is food moved through the digestive tract? ______________________________________
Nervous System
Primary function: _______________________________________________________________
Major organs: brain, spinal cord
Major tissue: nerves
Important Facts:
All five senses are part of the nervous system, what are the five senses?
______________________________________________________________________________
What is a stimulus? _____________________________________________________________
Endocrine System
Primary function: _______________________________________________________________
Major organs: endocrine glands
Major molecule: hormones
Important Fact: Male and female reproductive organs both produce hormones!
Immune System
Primary function: _______________________________________________________________
Major cells: white blood cells
Major molecule: antibodies
Important Fact:
What system do white blood cells and antibodies travel through? ________________________
Lymphatic System
Primary function: _______________________________________________________________
Major organs: lymph nodes, lymphatic vessels, spleen
Integumentary System
Primary function: _______________________________________________________________
Major organs: skin, hair follicles
Important Facts:
What parasites does the skin prevent from the entering the body? _______________________
The skin uses UV light from the sun to make what vitamin? _____________________________

Why do our bodies need Vitamin D? _______________________________________
How does skin help keep the body’s temperature regulated?
______________________________________________________________________________
Homeostasis Example:
 Sweat contains water and salts which absorb heat from the body and carry the heat
away when the water evaporates.
 Skin begins to sweat when the brain detects an increase in body’s temperature.
Reproductive System
Primary function: _______________________________________________________________
Major organs: testes (male) and ovaries (female)
Important Fact:
The male gamete cell is called a sperm and female gamete cell is called an ovum or egg.
Remember: Almost all organs belong to more than one system!