Unformatted text preview: vessels. When tissue P O2 values are low and hemoglobin can no longer supply more O 2 , myoglobin releases its bound O 2 . Diving mammals such as seals have high concentrations of myoglobin in their muscles, which is one reason they can stay under water for so long. (We will learn more about adaptations for diving in the next chapter.) Even in nondiving animals, muscles called on for extended periods of work frequently have more myoglobin than muscles that are used for short, intermittent periods, as we saw in the previous chapter....
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- Spring '08