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Human biology

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The lungs and pulmonary systemRed blood cellsCirculatory system and the heartHemoglobinComponents of blood
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Anatomy of a neuronOverview of neuron structure and functionSodium-potassium pumpCorrection to sodium-potassium pump videoThe membrane potentialElectrotonic and action potentialsSaltatory conduction in neuronsNeuronal synapses (chemical)The synapseNeurotransmitters and receptorsQ & A: Neuron depolarization, hyperpolarization, and action potentialsOverview of the functions of the cerebral cortex
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The kidney and nephronSecondary active transport in the nephron
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Myosin and actinHow tropomyosin and troponin regulate muscle contractionRole of the sarcoplasmic reticulum in muscle cellsAnatomy of a skeletal muscle fiber
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Role of phagocytes in innate or nonspecific immunityTypes of immune responses: Innate and adaptive, humoral vs. cell-mediatedB lymphocytes (B cells)Professional antigen presenting cells (APC) and MHC II complexesHelper T cellsCytotoxic T cells and MHC I complexesReview of B cells, CD4+ T cells and CD8+ T cellsInflammatory response

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