Print come set in a black 12x12 matte with backing board and is ready to frame. Bird - Bird - Muscles and organs: The cardiac (heart) muscles and smooth muscles of the viscera of birds resemble those of reptiles and mammals. Hummingbird hearts beat up to 1,200 beats per minute, compared with an average human resting heart rate of 60 to 100 beats per minute. A hummingbird's heart can beat from 500 to 600 times a minute when at rest and up to 1000 a minute in extreme conditions. Table 1. Leonardo da Vinci - Leonardo da Vinci - Anatomical studies and drawings: Leonardo’s fascination with anatomical studies reveals a prevailing artistic interest of the time. A ruby-throated hummingbird's heart beats from 225 times per minute when the bird is at rest to more than 1,200 times per minute when it is flying. The Hummingbirds , Despite their small size, are the birds have a larger heart compared to the proportions of the rest of their body. This is because the constant flapping of its wings demands a high energy consumption. The heart is the most important organ of the circulatory system of any vertebrate animal. In the Blue-throated Hummingbird (Lampornis clemenciae), 1260 beats a minute have been recorded. The heart of a hummingbird constitutes 2 to 5% of its body mass, whereas the equivalent in songbirds is 1 to 3% and 0.5% in primates. Hummingbirds are one of the few groups of birds that are known to go into torpor. They are structurally different than the valves found in mammalian hearts. Some of these muscles act to raise the feathers, others to depress them. Birds have evolved a light skeletal system and light but powerful musculature which, along with circulatory and respiratory systems capable of very high metabolic rates and oxygen supply, permit the bird to fly. Its wings beat about 70 times per second in direct flight and more than 200 times per second while diving. Structure of the circulatory system Heart . Printed on Finestra Fine Art Luster paper. 8x8 print of my original watercolor painting Strange Blooms #2. Asleep on the Job. Bird anatomy, or the physiological structure of birds' bodies, shows many unique adaptations, mostly aiding flight. The heart lies in contact with the liver dorsally and laterally and is four-chambered, meaning it has two atria and two ventricles, like the mammalian heart. Between each atrium and each ventricle exist a pair of valves called the atrioventricular valves. The smooth muscles in the skin include a series of minute feather muscles, usually a pair running from a feather follicle to each of the four surrounding follicles. 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