Cardiac Cycle

The cardiac cycle, one beat at a time.

The cardiac cycle is dynamic, and static diagrams struggle to convey it. This module animates a full beat so students can link valve action, pressure, and volume as they happen.

Students step through systole and diastole, see each valve open and close, and relate the events to the pressure-volume story of the heart.

Why animate the cardiac cycle?

• The cycle is defined by timing, and timing is precisely what a static pressure-volume diagram cannot convey.
• Valve action, pressure and volume all change together, so they need to be shown together.
• Stepping one phase at a time lets students pause exactly where their understanding breaks down.
• The heart sounds become obvious once you can see which valves are closing and when.

What the beat shows

• Atrial and ventricular systole and diastole
• Valve opening and closing through the cycle
• Pressure changes in the chambers
• Volume changes and chamber filling
• The heart sounds and their causes

Concepts it makes tangible

• The phases of one full cardiac cycle
• How valve action links to pressure and volume
• The pressure-volume story of a beat
• The timing of systole and diastole
• What produces the first and second heart sounds

How the simulation runs

• Step through the cycle one phase at a time
• A single-beat control links each phase to valve, pressure, and volume
• Move between working, inside, and cardiac-cycle views

How faculty use it

• Pre-lab or lecture support for cardiac physiology
• Self-paced revision of a dynamic process
• Demonstration for large groups
• Assessment of phases and valve timing

The 7thi AI tutor sits alongside the whole experience, scaffolding the difficult parts and giving subject-aware answers in context. Built-in assessment lets faculty see, per student, who has grasped which concepts - without grading another paper.

How the module works

Students step through a single heartbeat one phase at a time. The module animates a full beat and lets the student pause at each phase - atrial and ventricular systole and diastole - linking the valve positions, chamber pressures and volumes at that instant. Because the cycle is defined by timing, being able to stop exactly where understanding breaks down is the whole point. The heart sounds are tied to the specific valve closures that produce them, so an auscultation finding becomes a mechanical event the student can see rather than an association to be memorised.

What students take away

A student can describe the phases of the cardiac cycle in order, explain how valve action, pressure and volume change together through a beat, and account for the origin of the first and second heart sounds. They connect the pressure-volume relationships they meet on paper to a beating heart they can watch, which is the difference between memorising the cycle and understanding it.

In the classroom

Physiology courses use the module to teach a topic students consistently find difficult, either before the lecture as a primer or after it as consolidation. Being able to pause a single beat at any phase lets a lecturer or a student stop exactly where understanding breaks down. It pairs directly with the Human Heart Anatomy module, so learners meet the structures first and then see them in motion.

Interactive features and modes

The module animates a full heartbeat and lets students step through it one phase at a time, linking the valve positions, chamber pressures and volumes at each instant. The heart sounds are tied to the specific valve closures that produce them. A single-beat control gives students precise command over the pace, so they can stop exactly where their understanding needs to catch up.

Why it matters

The cardiac cycle is one of the hardest topics in early physiology because it is defined entirely by timing, and timing is precisely what a static pressure-volume diagram cannot convey. Valve action, chamber pressure and chamber volume all change together, so they need to be shown together and slowly. Animating a single beat that students can step through phase by phase turns an abstract set of curves into an intelligible sequence of events.

The bigger picture

The cardiac cycle ties together pressure, volume, valve action and the heart sounds into a single timed sequence, and it is the timing that makes it hard - a static pressure-volume loop shows the relationships but not the order in which they unfold. Linking each phase to the valve positions, pressures and volumes at that instant, and tying the heart sounds to the specific valve closures that cause them, turns a set of curves and facts into a coherent story. That understanding is what lets a student later interpret a murmur or a pressure trace rather than merely recall a definition.

Devices, deployment and assessment

Deploying the module is straightforward. It runs on Meta Quest, ClassVR and Pico headsets, on WebXR-compatible browsers, and on the desktop without any headset at all, so a department can start with the hardware it already has and scale as it grows. Faculty can assign the whole module or specific scenes, set it as pre-lab preparation or post-lab revision, and track progress on a dashboard that records concepts mastered, time per scene and assessment scores, with export to the LMS via xAPI. It pairs with the Human Heart Anatomy module, which covers the structures this module then sets in motion. The 7thi AI tutor answers student questions in context throughout, so learners are never left stuck and faculty are not fielding the same question forty times.

Who this module is for

• Medical, nursing and allied health undergraduates studying cardiac physiology
• Biology and physiology students covering the circulatory system
• Paramedic and health science programmes
• Faculty demonstrating a dynamic process to large groups