1. Human Systems

2. SKELETAL system interrelationships
Muscular: Provides support, creates movement
Circulatory: provides RBCs
Digestive: Provides nutrients needed for healthy
bone growth
Endocrine: hormones regulate growth
Nervous: Protection of brain/spinal cord

3. MUSCULAR system interrelationships
Circulatory: Circulates O2 to muscles
(heart is composed of cardiac muscle)
Skeletal: helps creates movement
Digestive: provides sugar needed for ATP
synthesis
Nervous: Stimulates muscle contraction and
movement

4. Integumentary System Interrelationship
Covers all other systems
Endocrine: Hormones stimulate oil secretion in skin
Immune: First line of defense
Digestive: Creation of Vitamin D
Nervous- stimulus response
Excretory – helps regulates body temperature by releasing
sweat and gasses.

5. CARDIOVASCULAR System Interrelationships
Endocrine: Circulates hormones
Lymphatic: Returns fluids to circulatory
system
Digestive: Brings nutrients that were
reabsorbed in intestines to cells that need
them
Excretory System: Removes wastes from blood stream
Muscular: Provides sugars and O2 needed for ATP
synthesis during muscle contraction

6. RESPIRATORY System Interrelationships
Muscular: Uses O2, increases respiration
during exercise
Circulatory: Circulates O2 and CO2
Nervous: “Fight or Flight” affects breathing
Excretory: Kidneys dispose of other
metabolic wastes (other than CO2)

7. DIGESTIVE System Interrelationships
Excretory: Eliminates nitrogenous wastes
produced.
Circulatory: Moves nutrients through body.
Endocrine: Hormones allow organs to
function/digest properly,
metabolism, hunger
Muscular: Muscle increases movement of
food through the whole digestive
tract

8. EXCRETORY System Interrelationships
Circulatory: Filters nitrogenous wastes from
blood in kidneys
Lymphatic: Maintains water balance in blood
Digestive: nitrogenous wastes reabsorbed can
exit; Urea-made in liver
Endocrine: hormones regulate

9. NERVOUS system Interrelationships
Integumentary: Sense of touch
Respiratory: Involuntary breathing
Muscular: Impulse to contract
Digestive: controls hunger

10. REPRODUCTIVE System Interrelationships
Muscular: supports reproductive organs and
are active during childbirth
Endocrine: Secretes hormones that control
sex organs
Digestive: developing fetus crowds digestive
organs during pregnancy, which
can cause heartburn, constipation, etc.

11. ENDOCRINE System Interrelationships
Reproductive: stimulate puberty and birth of child (i.e.
contractions, “water breaking”)
Digestive: stimulates metabolism of sugars
Immune: helps with immune responses
Circulatory: provides main transport medium for hormones
Respiration: Epinephrine increases respiration by dilating
bronchioles

12. Lymphatic / Immune Systems Interrelationships
Digestive: Pathogens ingested are destroyed
Excretory: Fluid is filtered in kidneys
Circulatory: WBCs travel in blood vessels;
fluid is returned into vessels
Skeletal: Cells are made in bone marrow
Integumentary: Skin acts as a barrier

13. Instructions: For each body system, you will need to:
- Create a model ACCORDING TO THE DIRECTIONS in your handout
- Give the system’s functions and components
- List the interrelationships the system has with
other systems.