How Heart Cells Turn into Bone

What happens to heart tissue when it becomes stiff and mineralized after a heart attack?

• It becomes more flexible and efficient.

• It can't properly send electrical signals, leading to an irregular heartbeat.

• It grows new, healthy muscle cells.

• It helps the heart pump blood more forcefully.

Which type of heart cells can sometimes change their function to act like cells that deposit minerals in bones?

• Blood vessel cells

• Nerve cells

• Cardiac fibroblasts

• Heart muscle cells

When researchers placed cardiac fibroblasts from mice with calcified hearts into healthy mouse hearts, what was the main observation?

• The healthy hearts became stronger and more resilient.

• The transplanted cells died quickly without causing any changes.

• The cells began depositing calcium and causing mineralization in the healthy heart tissue.

• The healthy heart tissue repaired the damaged fibroblasts.

What is a new, less harmful method researchers are using to learn about fish populations in the ocean?

• Using larger fishing nets to catch more fish.

• Asking commercial fishing companies for their catch data.

• Collecting and analyzing environmental DNA (eDNA) from seawater.

• Sending divers to count fish directly.