Download Human Body Systems

Human Body Systems
Human Body Organization
The Human Body
is composed of
Organ Systems
are composed of
Organs
are composed of
Tissues
are composed of
Cells
Circulatory System
Major Structures
• heart, blood vessels,
blood, lymph nodes and
vessels, lymph
Functions
• transports nutrients,
wastes, hormones,
and gases
Digestive System
Major Structures
• mouth, throat,
esophagus, stomach,
liver, pancreas, small and
large intestines
Functions
• extracts and absorbs
nutrients from food;
removes wastes;
maintains water and
chemical balances
Endocrine System
Major Structures
• hypothalamus, pituitary,
pancreas, pineal, adrenal,
thyroid, parathyroid,
testes, and ovaries
Functions
• regulates body
temperature, metabolism,
development, and
reproduction; maintains
homeostasis; regulates
other organ systems
Excretory System
Major Structures
• kidneys, urinary bladder,
ureters, urethra, skin,
lungs
Functions
• removes wastes from
blood; regulates
concentration of body
fluids
Immune System
Major Structures
• white blood cells, lymph
nodes and vessels, skin
Functions
• defends against
pathogens and diseases
Integumentary System
Major Structures
• skin, nails, hair
Functions
• protects against injury,
infection, and fluid loss;
helps regulate body
temperature
Muscular System
Major Structures
• skeletal, smooth, and
cardiac muscle tissues
Functions
• moves limbs and trunk;
moves substances
through body; provides
structure and support
Nervous System
Major Structures
• brain, spinal cord, nerves,
sense organs
Functions
• regulates behavior;
maintains homeostasis;
regulates other organ
systems; controls sensory
and motor functions
Reproductive System
Major Structures
• ovaries, uterus, and
breasts (in females);
testes and penis (in
males)
Functions
• produces gametes and
offspring
Respiratory System
Major Structures
• lungs, nose, mouth,
trachea
Functions
• moves air into and out of
lungs; controls gas
exchange between blood
and lungs
Skeletal System
Major Structures
• bones and joints
Functions
• protects and supports
the body and organs;
interacts with skeletal
muscles; produces red
blood cells, white blood
cells, and platelets