The Heartbeat Formula

The video explores the relationship between heart rate and lifespan in mammals, using elephants and shrews as examples. It explains that a mammal's lifespan can be predicted by dividing a constant by its heart rate. Despite their size differences, both elephants and shrews have hearts that beat approximately 1 billion times in their lifetimes. This shared trait is common among most wild mammals.

What unexpected commonality do different mammals like elephants and shrews share?

• They have the same lifespan.

• They have the same body size.

• They have the same number of heartbeats over a lifetime.

• They have the same heart rate.

How can a mammal's lifespan be predicted according to scientists?

• By its body size.

• By its heart rate.

• By its diet.

• By its habitat.

What is the heart rate of a shrew?

• 800 beats per minute

• 25 beats per minute

• 100 beats per minute

• 400 beats per minute

How long does an elephant typically live according to the formula?

• Around 75 years

• Around 10 years

• Around 30 years

• Around 50 years

Despite living longer, how many heartbeats does an elephant have in its lifetime?

• 3 billion

• 2 billion

• 1 billion

• 500 million