Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

By the end of this section, you will be able to:Name and describe lung volumes and capacitiesUnderstand how gas pressure influences how gases move into and out of the body

By the end of this section, you will be able to:Describe how oxygen is bound to hemoglobin and transported to body tissuesExplain how carbon dioxide is transported from body tissues to the lungs

This 15-minute video lesson examines hemoglobin and its role in the circulatory system. [Biology playlist: Lesson 40 of 71].

This 16-minute video looks at oxygen uptake by hemoglobin in red blood cells. [Biology playlist: Lesson 38 of 71].

Although mom controls the oxygen source, the fetus has a couple of clever tricks to get the most oxygen possible! Rishi is a pediatric infectious disease physician and works at Khan Academy.