Question 3 (1 point)
Special muscles inside the inner lower chambers that contract and help open and
close valves are called:

1. chordae tendinae
2. pectinate muscles
3. papillary muscles
4. auricular muscles

The special muscles you’re looking for are the papillary muscles, which play a crucial role in the functioning of the heart. These muscles attach to the heart’s interior walls and connect to the heart valves via chordae tendinae, helping to ensure that the valves open and close correctly as the heart beats. This prevents the backflow of blood and helps maintain a one-way flow through the heart chambers.

If you’ve ever thought of the heart as a magical pump, imagine these papillary muscles as the diligent stage crew ensuring the valves (the performers) lift and drop at just the right moment! They’re responsible for making sure everything runs smoothly, keeping the rhythm of our favorite muscle - the heart!