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Order the steps for CO2 removal from an exercising muscle cell to the outside air (use the idea of →\rightarrow as “next”).

  • CO2 diffuses from blood into alveolar air spaces

  • Right heart pumps blood to pulmonary capillaries around alveoli

  • CO2 diffuses from muscle cell into interstitial fluid and then capillary blood

  • CO2 is carried in venous blood (mostly as bicarbonate) to the right heart

  • CO2 leaves the body during exhalation (out to the atmosphere)

Course
Foundations of Human Biology
8 units36 lessons
Topics
BiologyHuman AnatomyHuman PhysiologyCell BiologyMolecular BiologyGenetics
About this course

This course builds a coherent framework for understanding human biology from molecules to organ systems. It develops scientific thinking and data literacy while covering cell structure and function, biomolecules, membranes and transport, enzymes and metabolism, and energy flow with ATP. It links tissues to organ-level physiology, emphasizing homeostasis, feedback, and core mechanisms in circulatory, respiratory, digestive, renal, nervous, endocrine, immune, musculoskeletal, integumentary, and reproductive systems, including gas exchange and circulation fundamentals. Foundations in Mendelian and molecular genetics, gene regulation and variation, and evolutionary principles are integrated with quantitative skills for rates, proportions, and graph interpretation.