Big Breathers

The video explains how underwater mammals like whales can hold their breath longer than humans. It introduces Millie, a humpback whale, who inhales significantly more air and uses it more efficiently. Millie absorbs over 90% of the oxygen she inhales due to higher myoglobin levels in her muscles. Additionally, she conserves energy by using fewer muscles, slowing her blood flow and heartbeat, allowing her to dive for up to 20 minutes.

What is a key difference between how humans and underwater mammals like whales breathe?

• Underwater mammals breathe water instead of air.

• Underwater mammals can hold their breath longer than humans.

• Humans can hold their breath longer than underwater mammals.

• Underwater mammals do not need to breathe air.

How much more air does Millie, the humpback whale, inhale in one breath compared to humans?

• 100 times more

• 500 times more

• 3000 times more

• 10000 times more

What percentage of oxygen does Millie absorb from the air she inhales?

• 70%

• 20%

• 50%

• 90%

What substance in Millie's muscle tissue helps her absorb more oxygen?

• Hemoglobin

• Myoglobin

• Nitrogen

• Carbon dioxide

How does Millie conserve oxygen while swimming?

• By using more muscles

• By swimming faster

• By holding her breath longer

• By slowing down her blood flow and heartbeat