Why River Otters Have Bones… In Their Hearts

The video explores the presence of bone tissue in the hearts of river otters and other animals, contrasting it with the human cardiac skeleton, which is made of connective tissue. While bone in human hearts is a sign of disease, in animals like otters, it may be an adaptation to stress. Otters have large hearts relative to their body size, aiding their active aquatic lifestyle. The formation of bone tissue in their hearts is thought to be a response to physical stress, providing structural support. This adaptation highlights the body's ability to evolve new anatomical features in response to environmental demands.

What is the primary function of the cardiac skeleton in human hearts?

• To produce red blood cells

• To store calcium deposits

• To anchor soft parts of the heart and direct electrical signals

• To pump blood throughout the body

What is endochondral ossification?

• The breakdown of bone tissue

• The hardening of arteries

• The process of bone formation from cartilage

• The formation of cartilage from bone

Why might river otters develop heart bones?

• To improve their breathing efficiency

• To help them dive deeper

• To support their large hearts during constant swimming

• To increase their buoyancy

How do river otters' heart sizes compare to their body weight?

• Their hearts are nearly a full percent of their body weight

• Their hearts are about 6/10 of a percent of their body weight

• Their hearts are the same size as human hearts

• Their hearts are smaller than most mammals

What is a potential reason for the random placement of heart bones in otters?

• It indicates a genetic mutation

• It is a result of their diet

• It suggests a response to stress over time

• It shows a lack of calcium in their diet