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35–1 Human Body
Systems
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35–1 Human Body Systems
Organization of the Body
Organs and Organ Systems
A group of different types of tissues that work
together to perform a single function is called an
organ.
A group of organs that perform closely related
functions is an organ system.
There are eleven organ systems in the body.
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35–1 Human Body Systems
Organization of the Body
Nervous System
Structures: Brain, Spinal
Cord, Peripheral Nerves,
Sensory Organs
Function: Detects stimuli and
coordinates the body’s
response to changes in its
internal and external
environments
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35–1 Human Body Systems
Organization of the Body
Circulatory System
Structures: Heart, blood &
blood vessels
Function: Brings oxygen,
nutrients, and hormones to
cells; fights infection;
removes cell wastes; helps to
regulate body temperature
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35–1 Human Body Systems
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35–1 Human Body Systems
Organization of the Body
Respiratory System
Structures: Mouth, nose,
pharynx, larynx, trachea,
bronchi, bronchioles, lungs
Function: Provides
oxygen needed for cellular
respiration and removes
excess carbon dioxide
from the body
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35–1 Human Body Systems
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35–1 Human Body Systems
Organization of the Body
Digestive System
Structures: Mouth, pharynx,
esophagus, liver, gall
bladder, pancreas, stomach,
small and large intestines,
rectum
Function: Converts food
into simpler molecules that
can be used by the cells of
the body; absorbs food;
eliminates wastes
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35–1 Human Body Systems
Mechanical
Chemical
stomach muscles contract
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35–1 Human Body Systems
Organization of the Body
Urinary/Excretory
System
Structures: Skin,
kidneys, ureters,
urinary bladder, urethra
Function: Eliminates
waste products from the
body in ways that
maintain homeostasis
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35–1 Human Body Systems
MAIN
ORGAN OF
EXCRETORY
SYSTEM =
KIDNEYS
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35–1 Human Body Systems
Organization of the Body
Endocrine System
Structures: Hypothalamus,
pituitary, thyroid,
parathyroid, adrenals,
pancreas, ovaries (in
females), testes (in males)
Function: Controls growth,
development and
metabolism; maintains
homeostasis;
Produces Hormones
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35–1 Human Body Systems
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35–1 Human Body Systems
Organization of the Body
The Male Reproductive System
Reproductive System
Structures:
Male: Testes, Prostate,
Epididymus, Vas Deferens, Penis
Female: Ovaries, Uterus,
Fallopian Tubes, Cervix, Vagina
The Female Reproductive System
Function:
Produce Gametes (sperm/egg);
Produce/Nurture Offspring
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35–1 Human Body Systems
Organization of the Body
Skeletal System
Structures: Bones, cartilage,
ligaments
Function: Supports the body;
protects internal organs;
allows movement; stores
mineral reserves; provides a
site for blood cell formation
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35–1 Human Body Systems
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35–1 Human Body Systems
Organization of the Body
Muscular System
Structures: Skeletal muscle,
smooth muscle, cardiac
muscle; tendons
Function: Works with skeletal
system to produce voluntary
movement; helps to circulate
blood and move food through
the digestive system
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35–1 Human Body Systems
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35–1 Human Body Systems
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35–1 Human Body Systems
Organization of the Body
Integumentary System
Structures: Skin, hair, nails,
sweat and oil glands
Function: Serves as a
barrier against infection and
injury; helps to regulate
body temperature; provides
protection against ultraviolet
radiation from the sun
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35–1 Human Body Systems
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35–1 Human Body Systems
Organization of the Body
Lymphatic/Immune Systems
Structures: White blood cells,
thymus, spleen, lymph nodes,
lymph vessels
Function: Helps protect the
body from disease; collects
fluid lost from blood vessels
and returns the fluid to the
circulatory system
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35–1 Human Body Systems
White Blood Cell
Fluid
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System
35–1 Human Body Systems
Organs
Function
Cardiovascular Heart, Blood, Blood Vessels Transport of Gases,
Nutrients, & Wastes;
Temperature Regulation
Respiratory
Mouth, Pharynx, Larynx,
Trachea, Bronchi, Lungs
Gas Exchange (O2 in &
CO2 out)
Digestive
Mouth, Pharynx,
Break Down Food &
Esophagus, Stomach, Liver, Absorb Nutrients;
Intestines
Eliminates Waste
Urinary
Kidneys, Ureters, Bladder,
Urethra
Endocrine
Glands: Hypothalamus,
Produce & Secrete
Pituitary, Thyroid, Adrenals, Hormones; Maintain
Ovaries & Testes
Homeostasis
Filter Waste Out of Blood &
Maintain Homeostasis
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System
35–1 Human Body Systems
Organs
Function
Nervous
Brain, Spinal Cord,
Peripheral Nerves, Sensory
Organs
Communication, Control &
Coordination
Lymphatic/
Immune
Lymph Nodes, Thymus,
Spleen, White Blood Cells
Return Lost Fluid to Blood
Stream & Fight Infection
Integumentary
Skin, Hair, & Nails; Sweat &
Oil Glands
Protection & Covering;
Temperature Regulation;
Prevents Infections
Muscular
Muscles & Tendons
Movement of Skeleton &
Internal Organs
Skeletal
Bones, Ligaments, &
Cartilage
Support, Protection,
Mineral Storage, & Blood
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Cell Formation