1.2 Levels of Structural Organization
atoms
smallest level
Skeletal system
- bones, joints, cartilage, ligaments function: structure, protection
Nervous System
- brain, nerves, spinal cord, sensory receptors function: protection, coordination, fast-acting control
endocrine system
- endocrine glands (pituitary, adrenal, thyroid, & pineal glands, pancreas, testes(males), ovaries(female)) function: secretes hormones into the blood, regulation
Cardiovascular system
- heart and blood vessels function: transportation (of blood, nutrients, hormones, oxygen, waste)
Urinary System
- kidneys, bladder, ureters, urethra function: excretion, filtration, blood pressure
Respiratory System
- lungs, nasal passages, trachea, pharynx, larynx function: gas exchange (CO2 & O2)
Lymphatic System
- lymph nodes, lymph vessels, thymus, spleen, tonsils function: filtration, immunity
Digestive System
- oral cavity, esophagus, liver, stomach, small/large intestine, anus function: break down food, waste management
Muscular System
- skeletal muscle (ex: biceps) function: movement, produce body heat
Integumentary system
- skin, nails, hair function: protection, waterproofs body, body temperature regulation, vitamin D production
tissue
A group of similar cells
respiratory
Did You Get It? - Which organ system includes the trachea, lungs, nasal cavity, and bronchi?
urinary
Did You Get It? - Which system functions to remove wastes and help regulate blood pressure?
organ, chemical/molecular level
Did You Get It? - At which level of structural organization is the stomach? At which level is a glucose molecule?
organ system
Different organs work together to perform a specific/common function.
organism
all 11 organ systems working together to maintain life
cellular
atoms combine to form molecules
organs
different types of tissues
reproductive system
i. females: uterus, ovaries, vagina, mammary glands ii. males: prostate glands, testes, penis function: produce offspring
atoms, cells, tissues, organs, organ systems, organisms
name the six levels of structural organization that make up the human body