How does myoglobin aid diving mammals such as the Weddell seal?

• A. It allows diving seals to store twice as much oxygen in their blood as the average human of similar size.
• B. It allows diving seals to store a considerable amount of oxygenated blood in their spleens.
• C. It allows seals to switch from cellular respiration to fermentation after the oxygen in muscle cells has been depleted.
• D. None of the listed responses is correct.
• E. It allows diving seals to store a considerable amount of oxygen in their muscles.

Answer: (E)

Verified step by step guidance

1. Understand the role of myoglobin: Myoglobin is a protein found in muscle tissues that binds oxygen molecules. It serves as an oxygen reservoir, allowing muscles to maintain oxygen supply during periods of low availability, such as during diving.
2. Recognize the adaptation in diving mammals: Diving mammals like the Weddell seal have high concentrations of myoglobin in their muscles, which enables them to store more oxygen directly in muscle tissues compared to non-diving mammals.
3. Consider the physiological benefits: By storing oxygen in muscles, seals can sustain aerobic respiration longer while underwater, reducing the need to surface for air frequently and allowing extended dive times.
4. Differentiate from other oxygen storage methods: While seals do store oxygen in their blood and spleen, the primary advantage of myoglobin is its ability to store oxygen directly in muscle tissues, which is crucial for prolonged dives.
5. Conclude with the correct function: The key function of myoglobin in diving mammals is to store a considerable amount of oxygen in their muscles, supporting their ability to dive for extended periods without needing to resurface.