Download Body Systems Notes

Interdependence in Living Systems
• Levels of organization:
– Cells: 1st level of organization. The basic unit of
structure and function
– Tissues: a group of cells that perform the same function
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Muscle
Connective
Nerve
Epithelial
– Organs: a group of tissues that perform a specific
function
– Organ systems: a group of organs that work together
Nervous System
• Obtains and processes information from the body’s
internal and external environment. Directs most
body’s functions
Cardiovascular System
• Transports needed materials to body cells.
• removes waste
• Main components are heart, arteries, and veins
Digestive System
• Breaks down food and absorbs the broken-down
materials
• Main components are liver, stomach, gall bladder,
small intestine, and large intestine
Respiratory System
• Gets oxygen into the body
• Removes carbon dioxide
• Main components are trachea, lungs, and
diaphragm
Muscular System
• Enables the body to move
• Includes cardio muscle, smooth muscle, and
skeletal muscle
Skeletal System
• Supports and protects the body
• Works with muscles to enable movement
Endocrine System
• Produces chemicals called hormones that help
control many body processes
• Main components are glands, stomach, pancreas,
and kidneys
Excretory System
• Removes waste
• Helps regulate water in the body
• Main component is kidney
Immune System
• Fights disease
• Main components are liver, lymph nodes, blood,
and thymus
Integumentary (skin) System
• Protects the body
• Keeps water inside
• Helps sense the external environment
Reproductive System
• Creates offspring
• Determines male and female characteristics