Human Body Systems Human Body Organization The Human
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
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