Photo courtesy of Terrie Williams. The heartbeats of most species, when frightened or stressed, tend to quicken. That is not so, however, for narwhals. When the marine mammals encounter stress, their ...
Verywell Health on MSN
What Are Heart Sounds and How to Know If They’re Normal
Heart sounds are the noises made as blood moves through the heart with each heartbeat. When the heart valves close, they make a distinct lubb-dupp sound. Healthcare providers listen to the heart's ...
The masters of the ocean are also masters of their bodies. (CN) — Dolphins are masters of the ocean. Strong, tenacious and keenly intelligent, these ocean-dwelling mammals actively cooperate with ...
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