Considering the significant difference in heart size between a house mouse and a blue whale, what can you infer about their typical resting heart rates? Explain your reasoning.

I can infer that a house mouse would have a significantly faster resting heart rate compared to a blue whale. Smaller animals generally have higher metabolic rates and thus require their heart to pump blood more frequently to meet oxygen and nutrient demands, leading to a faster heart rate.

Why might a larger animal, like a blue whale, generally have a slower heart rate compared to a smaller animal, like a house mouse, despite needing to pump blood through a much larger body?

Larger animals generally have slower metabolic rates per unit of body mass compared to smaller animals. While they have more body mass to supply, their cells consume oxygen and nutrients at a slower rate, allowing for a slower heart rate to efficiently circulate blood.

Describe one way an animal's activity level can influence its heart rate.

When an animal engages in physical activity, its muscles require more oxygen and nutrients. To meet this increased demand, the heart rate increases to pump blood faster and deliver these essential resources to the working muscles.

Why Animal Hearts Beat Differently Lesson Plan for 9th Grade

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Objective

I can analyze the factors that influence an animal's heart rate.

Part 1 of 4

Warm-up video

BBC · 1:33

We don't generate video — this one is by BBC on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.

Part 2 of 4

Key concepts

3 concepts

1
The blue whale's heart is significantly larger than those of a mouse, a turkey, or a cow, reflecting its status as the biggest animal on Earth.
2
Removing the blue whale's heart was a challenging task, requiring four people to push it out through a window made in the chest cavity.
3
Researchers are testing the accuracy of claims about the blue whale's heart, such as the idea that a person could swim through its aorta.

Part 3 of 4

Practice

12 questions

Based on the provided content, which animal mentioned has the largest heart?

According to the content, which animal has a 'tiny' heart?

Part 4 of 4

Exit ticket

Quick comprehension check

“The video shows the hearts of a tiny house mouse, a turkey, a domestic cow, and the enormous blue whale. Based on the range of animals presented, identify one physical characteristic that likely influences an animal's heart rate.”

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Why Animal Hearts Beat Differently

Objective

Warm-up video

Key concepts

Practice

Exit ticket

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