The Human Body Systems

Digestive System Functions Takes in food Digests food into smaller molecules Absorbs nutrients Removes undigested food

Digestive System Major Organs Mouth Pharynx Esophagus Stomach Small intestine Large intestine Rectum Anus Accessory Organs Salivary glands Pancreas Liver Gall bladder

INTERACTIONS WITH OTHER SYSTEMS Digestive System INTERACTIONS WITH OTHER SYSTEMS Circulatory: absorbs and delivers digested nutrients to the cells Muscular: controls contractions of the digestive organs to pass food along Nervous: brain maintains homeostasis by triggering your appetite

Circulatory System Functions Transports materials throughout the body, such as: -Water -Oxygen -Nutrients -Waste

Circulatory System Major Organs Heart Veins Arteries Capillaries Red blood cells

INTERACTIONS WITH OTHER SYSTEMS Circulatory System INTERACTIONS WITH OTHER SYSTEMS Respiratory: delivers O2 from lungs to cells and CO2 from cells to lungs Digestive: absorbs and delivers digested nutrients to cells Excretory: kidneys filter cell waste from the blood

Circulatory System Lymphatic: helps transport substances to and from the cells Immune: transports white blood cells to fight infection Nervous: supplies blood to the brain to control heartbeat Endocrine: transports hormones

Nervous System Functions Receives and interprets information Responds to information Maintains homeostasis Stimulates muscles for movement

Nervous System Major Organs Brain Spinal Cord Nerves Nerve cell (called neurons) Hypothalamus

INTERACTIONS WITH OTHER SYSTEMS Nervous System INTERACTIONS WITH OTHER SYSTEMS The nervous system controls ALL other systems Hypothalamus: maintains homeostasis

Excretory System Functions Removes waste from cells that was produced by cell metabolism -urine -water -CO2 Filters blood

Excretory System Major Organs Kidneys Ureters Bladder Urethra Lungs Skin (sweat glands) Liver

INTERACTIONS WITH OTHER SYSTEMS Excretory System INTERACTIONS WITH OTHER SYSTEMS Circulatory: filters waste out of blood Lungs: removes CO2 waste Integumentary: removes excretory waste

Respiratory System Functions Supplies blood with oxygen Removes carbon dioxide waste Removes water

Respiratory System Major Organs Nose Trachea Bronchi Broncioles Alevoli Lungs

INTERACTIONS WITH OTHER SYSTEMS Respiratory System INTERACTIONS WITH OTHER SYSTEMS Circulatory: takes in oxygen and delivers it to cells; removes carbon dioxide Excretory: removes excretory waste Nervous: controls breathing Muscular: diaphragm controls breathing

Skeletal System Functions Protects organs Provides shape and support Stores materials (fats and minerals) Produces blood cells Allows movement

Skeletal System Major Organs Bones Cartilage Ligaments *not tendons because they are part of the muscular system

INTERACTIONS WITH OTHER SYSTEMS Skeletal System INTERACTIONS WITH OTHER SYSTEMS Muscular: allows movement Circulatory: produces blood cells Immune: produces white blood cells Circulatory/Respiratory: protects softer organs

Muscular System Functions Allows for movement of bones and body by contractions

Muscular System Major Organs Cardiac Muscles (involuntary) Smooth Muscles (involuntary) Skeletal Muscles (voluntary)

INTERACTIONS WITH OTHER SYSTEMS Muscular System INTERACTIONS WITH OTHER SYSTEMS Skeletal: allows movement Digestive: allows organs to push food through the pathway Respiratory: diaphragm controls breathing Circulatory: controls pumping of blood Nervous: controls all muscle contractions

Endocrine System Functions 1. Regulates body activities using hormones

Endocrine System Major Organs Glands that produce hormones: Hypothalamus Pituitary gland Thyroid gland Thymus Adrenal gland Pancreas

INTERACTIONS WITH OTHER SYSTEMS Endocrine System INTERACTIONS WITH OTHER SYSTEMS Circulatory: transports hormones Nervous: maintains homeostasis and releases hormones Reproductive: controls hormone release Skeletal: controls growth of bones

Immune System Functions 1. Uses white blood cells to fight off foreign invaders (infections)

Immune System Major Organs White blood cells -T cells -B cells -Macrophages Skin Spleen

INTERACTIONS WITH OTHER SYSTEMS Immune System INTERACTIONS WITH OTHER SYSTEMS Circulatory: transports WBC’s Lymphatic: produces WBCs to fight infections; spleen filters blood Skeletal: makes white blood cells Integumentary: prevents foreign matter from getting into the body

Integumentary System Functions Barrier against infection Helps regulate body temperature Removes waste Protects from UV rays Produces vitamin D

Integumentary System Major Organs Skin (epidermis/dermis) Sweat glands Sebaceous glands Hair follicles Blood vessels Nerves

Integumentary System Excretory: removes cellular waste INTERACTIONS WITH OTHER SYSTEMS Excretory: removes cellular waste Nervous: controls body temperature Immune: prevents pathogens from entering the body

Lymphatic System Functions Stores and carries white blood cells that fight disease Collects excess fluid and returns it to the blood (fluid drainage system)

Lymphatic System Major Organs Lymph (liquid part of the blood) Lymph vessels Lymph nodes White Blood Cells

INTERACTIONS WITH OTHER SYSTEMS Lymphatic System INTERACTIONS WITH OTHER SYSTEMS Immune: holds lots of white blood cells Circulatory: transports materials to and from the cells