There are 11 major body systems that work together to maintain homeostasis: 1. The nervous system controls and coordinates functions throughout the body and responds to stimuli. 2. The skeletal system supports the body, protects organs, allows movement, and stores minerals. 3. The muscular system works with the skeletal system to produce movement and circulate blood. 4. The integumentary system acts as a barrier against infection/injury and regulates temperature.

1. Animal Cells, Tissues and Systems
Levels of organization
Cells—
Tissues—
Organs—
Organ Systems—
Tissue Types
Epithelial—

2. Homeostasis—
All body systems work together to maintain homeostasis
Negative Feedback Examples of Temperature Control (Ways to maintain homeostasis)
Endotherm—
Ex. birds and mammals
Ectotherm—
Ex. reptile, amphibians, fishes
Body Systems
1. Nervous System—
Function—controls and coordinates functions throughout the
body and responds to internal and external stimuli.
Steps of synaptic nerve activity
1.
2.
3.
4.
Frontal Lobe: making judgments,
forming plans, evaluating consequences

3. 2. Skeletal System—
Function—supports the body, protects internal organs, allows movement, stores
mineral reserves, and provides a site for blood cell formation.
3. Muscular System—
Function—works with skeletal system to produce voluntary movement, helps to circulate blood
and move food through the digestive system
4. Integumentary System—
Function—serves as a barrier against infection and injury, helps to
regulate body temperature, provides protection against ultraviolet
radiation from the sun
E—sebaceous (oil) gland

4. 5. Circulatory System—
Function—carries oxygen, nutrients, and hormones to the cells of the body, helps fight
infection, carries cell waste to the kidneys, helps regulate body temperature
6. Respiratory System—
Function—provides oxygen needed for cellular respiration and
removes excess carbon dioxide from the body.
7. Digestive System—
Function—breaks down food into simpler compounds that the cells of the body can use,
absorbs nutrient, absorbs water, eliminates waste.

5. 8. Excretory System—
Function—eliminates waste in ways that maintain proper water and salt balance (homeostasis)

6. 9. Endocrine System—
Function—controls growth, development, and metabolism, sexual maturity (reproduction), also
maintains homeostasis
10. Reproductive System—
Function—produces reproductive cells, eggs in females, sperm in males,
provides for the developing embryo
11. Lymphatic/Immune Systems—
Function—helps protect the body from disease, collects fluid lost from blood vessels and
returns the fluid to the circulatory system