Welcome aboard this exciting journey as we take a deep dive into the heart of mammals! By the end of our journey, you’ll be mesmerized by how our heart has evolved over time to keep us alive and kicking!

• Ventricles: Think of these as the strongmen of the heart, with robust muscular walls. Why? To pump blood with force into our arteries! 💪
• Atria: These are the welcoming chambers collecting blood from veins and then prepping the ventricles for the next big push! They ensure the ventricles are stuffed and ready to go!
• Atrioventricular Valves: Serving as the heart's security guards, these ensure there's no sneaky backflow of blood to the atria when the powerhouses, aka the ventricles, are contracting.
• Semilunar Valves: Another set of bodyguards for our heart. They are in charge of directing traffic between the ventricles and the arteries.
• Cardiac Muscle: This isn't your regular muscle! With branched cells and unique connections, they can beat without any external signals. In simple terms, they're self-starters! 🎉
• Pacemaker: Located in the right atrium, this is like the heart's drummer setting the beat! Thanks to the sinoatrial node, every heartbeat gets its initiation signal.
• Septum: This wall is the ultimate divider, ensuring oxygen-rich blood and oxygen-depleted blood don’t mix. It’s like the wall between two very different parties!
• Coronary Vessels: They are the heart’s delivery service, ensuring the heart itself gets fresh oxygen and nutrients while also removing waste.