Key Idea.
Section 1
Micro Energy Powers Macro Movement
There is a direct link between tiny cells and big body movements. The energy released by cellular respiration is what powers muscle contraction.
When you run or jump, your muscles are using the energy produced by billions of individual cells working at once. Thus, macroscopic physical activity is powered by microscopic chemical events.
Section 2
Delivery Rate Determines Energy Level
The body's energy level depends on supply lines. The circulatory system delivers the necessary glucose and oxygen to the cells.
The rate of delivery determines how much energy can be produced. During exercise, the heart beats faster to deliver these molecules more quickly, allowing cells to increase respiration and release the extra energy needed for intense activity.
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Section 1
Micro Energy Powers Macro Movement
There is a direct link between tiny cells and big body movements. The energy released by cellular respiration is what powers muscle contraction.
When you run or jump, your muscles are using the energy produced by billions of individual cells working at once. Thus, macroscopic physical activity is powered by microscopic chemical events.
Section 2
Delivery Rate Determines Energy Level
The body's energy level depends on supply lines. The circulatory system delivers the necessary glucose and oxygen to the cells.
The rate of delivery determines how much energy can be produced. During exercise, the heart beats faster to deliver these molecules more quickly, allowing cells to increase respiration and release the extra energy needed for intense activity.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter