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Human body systems

NGSS: HS‑LS1.A
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HomeostasisHomeostasisTissues, organs, & organ systemsBody structure and homeostasis review
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Body structure and homeostasisGet 3 of 4 questions to level up!
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Meet the heart!Circulatory system and the heartThe circulatory system reviewMeet the lungsThe lungs and pulmonary systemThe respiratory system review
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The circulatory and respiratory systemsGet 3 of 4 questions to level up!
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Skeletal structure and functionCartilageLigaments, tendons, and jointsThree types of muscleAnatomy of a skeletal muscle cellLeBron Asks: What muscles do we use when shooting a basket?The musculoskeletal system review
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The musculoskeletal systemGet 3 of 4 questions to level up!
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Meet the gastrointestinal tract!Kidney function and anatomyUrinationThe digestive and excretory systems review
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The digestive and excretory systemsGet 3 of 4 questions to level up!
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Structure of the nervous systemAnatomy of a neuronIntro to the endocrine systemThe nervous and endocrine systems review
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The nervous and endocrine systemsGet 3 of 4 questions to level up!
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Welcome to the reproductive systemEgg, sperm, and fertilizationThe reproductive system review
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The reproductive systemGet 3 of 4 questions to level up!
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Types of immune responses: Innate and adaptive, humoral vs. cell-mediatedRole of phagocytes in innate or nonspecific immunitySelf vs. non-self immunityIntro to virusesViral replication: lytic vs lysogenicThe immune system review
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The immune systemGet 3 of 4 questions to level up!

About this unit

Your body is an amazing system! The human body is made up of groups of organs, called organ systems, that work together to keep the body in balance. In this section, we'll travel from the circulatory system, to the nervous system, to the immune system and beyond. Learn about the amazing biology that keeps your body ticking!
Biology is brought to you with support from the
Amgen FoundationAmgen Foundation