How does the circulatory system support a bird's ability to fly?

• A. By reducing the heart rate during flight
• B. By increasing the size of the air sacs
• C. By providing oxygen-rich blood to the flight muscles
• D. By storing excess carbon dioxide in the lungs

Answer: (C)

Verified step by step guidance

1. Understand the role of the circulatory system in birds: The circulatory system is responsible for transporting oxygen, nutrients, and waste products throughout the body. In birds, it plays a crucial role in supporting high-energy activities like flight.
2. Identify the key components involved: The heart pumps oxygen-rich blood through arteries to various parts of the body, including the flight muscles. These muscles require a continuous supply of oxygen to sustain the energy demands of flying.
3. Consider the physiological adaptations in birds: Birds have a highly efficient circulatory system with a strong heart and a high metabolic rate, which ensures that oxygen is rapidly delivered to the muscles during flight.
4. Evaluate the importance of oxygen delivery: During flight, the demand for oxygen increases significantly. The circulatory system must provide a steady supply of oxygen-rich blood to the flight muscles to maintain their function and endurance.
5. Conclude with the correct mechanism: The circulatory system supports a bird's ability to fly by providing oxygen-rich blood to the flight muscles, enabling sustained energy production and muscle activity necessary for flight.