diff --git a/BodySim.Tests/BodyTests.cs b/BodySim.Tests/BodyTests.cs
new file mode 100644
index 0000000..27bea66
--- /dev/null
+++ b/BodySim.Tests/BodyTests.cs
@@ -0,0 +1,32 @@
+using System.Text.Json;
+
+namespace BodySim.Tests;
+
+public class BodyTests
+{
+    [Fact]
+    public void Constructor_InitializesRespiratorySystem()
+    {
+        var body = new Body();
+
+        Assert.NotNull(body.GetSystem(BodySystemType.Respiratory));
+    }
+
+    [Fact]
+    public void ExportForGodotJson_ContainsSystemsAndResources()
+    {
+        var body = new Body();
+
+        using var document = JsonDocument.Parse(body.ExportForGodotJson());
+        var root = document.RootElement;
+
+        Assert.True(root.GetProperty("resources").TryGetProperty(BodyResourceType.Blood.ToString(), out _));
+
+        var systems = root.GetProperty("systems");
+        Assert.True(systems.TryGetProperty(BodySystemType.Skeletal.ToString(), out _));
+        Assert.True(systems.TryGetProperty(BodySystemType.Circulatory.ToString(), out _));
+        Assert.True(systems.TryGetProperty(BodySystemType.Respiratory.ToString(), out var respiratory));
+        Assert.True(respiratory.TryGetProperty(BodyPartType.Chest.ToString(), out var chest));
+        Assert.True(chest.GetProperty("components").TryGetProperty(BodyComponentType.AirFlow.ToString(), out _));
+    }
+}
diff --git a/BodySim/Body.cs b/BodySim/Body.cs
index ace44e4..a58114d 100644
--- a/BodySim/Body.cs
+++ b/BodySim/Body.cs
@@ -1,3 +1,5 @@
+using System.Text.Json;
+
 namespace BodySim;
 
 public class Body
@@ -61,4 +63,33 @@ public void Clot(BodyPartType bodyPart)
     {
         return Systems.TryGetValue(systemType, out BodySystemBase? system) ? system : null;
     }
+
+    public string ExportForGodotJson(bool indented = false)
+    {
+        var payload = new
+        {
+            resources = ResourcePool.GetResources().ToDictionary(resource => resource.Key.ToString(), resource => resource.Value),
+            systems = Systems.ToDictionary(
+                system => system.Key.ToString(),
+                system => system.Value.GetNodes().ToDictionary(
+                    node => node.Key.ToString(),
+                    node => new
+                    {
+                        status = node.Value.Status.ToString(),
+                        components = node.Value.Components.ToDictionary(
+                            nodeComponent => nodeComponent.ComponentType.ToString(),
+                            nodeComponent => new
+                            {
+                                current = nodeComponent.Current,
+                                max = nodeComponent.Max,
+                                regenRate = nodeComponent.RegenRate,
+                            }),
+                    }))
+        };
+
+        return JsonSerializer.Serialize(payload, new JsonSerializerOptions
+        {
+            WriteIndented = indented
+        });
+    }
 }
diff --git a/BodySim/BodySystemBase.cs b/BodySim/BodySystemBase.cs
index 3ec5a93..78f8392 100644
--- a/BodySim/BodySystemBase.cs
+++ b/BodySim/BodySystemBase.cs
@@ -37,6 +37,8 @@ public void SetNodeStatus(BodyPartType bodyPartType, SystemNodeStatus status)
         }
         return null;
     }
+
+    public IReadOnlyDictionary<BodyPartType, BodyPartNodeBase> GetNodes() => Statuses;
     
     public virtual void MetabolicUpdate()
     {
diff --git a/BodySim/RespiratorySystem.cs b/BodySim/RespiratorySystem.cs
new file mode 100644
index 0000000..a85fd4a
--- /dev/null
+++ b/BodySim/RespiratorySystem.cs
@@ -0,0 +1,60 @@
+namespace BodySim;
+
+public class RespiratorySystem : BodySystemBase
+{
+    private const float NormalAirFlow = 100f;
+
+    public RespiratorySystem(BodyResourcePool pool, EventHub eventHub)
+        : base(BodySystemType.Respiratory, pool, eventHub)
+    {
+        InitSystem();
+        eventHub.RegisterListener<SuffocateEvent>(this);
+        eventHub.RegisterListener<ClearAirwayEvent>(this);
+    }
+
+    public override void HandleMessage(IEvent evt)
+    {
+        switch (evt)
+        {
+            case SuffocateEvent suffocateEvent:
+                SetAirwayState(suffocateEvent.BodyPartType, blocked: true);
+                break;
+            case ClearAirwayEvent clearAirwayEvent:
+                SetAirwayState(clearAirwayEvent.BodyPartType, blocked: false);
+                break;
+        }
+    }
+
+    public override void InitSystem()
+    {
+        foreach (BodyPartType partType in Enum.GetValues<BodyPartType>())
+        {
+            Statuses[partType] = new RespiratoryNode(partType);
+        }
+    }
+
+    private void SetAirwayState(BodyPartType bodyPartType, bool blocked)
+    {
+        if (!Statuses.TryGetValue(bodyPartType, out var node)) return;
+        node.Status = blocked ? SystemNodeStatus.Disabled : SystemNodeStatus.Healthy;
+        var airflow = node.GetComponent(BodyComponentType.AirFlow);
+        if (airflow != null)
+        {
+            airflow.Current = blocked ? 0 : NormalAirFlow;
+        }
+    }
+}
+
+public class RespiratoryNode(BodyPartType bodyPartType) : BodyPartNodeBase(bodyPartType, CreateComponents())
+{
+    private const float DefaultComponentValue = 100f;
+    private const float HealthRegenRate = 0.1f;
+    private const float NoRegenRate = 0f;
+
+    private static List<BodyComponentBase> CreateComponents() =>
+    [
+        new BodyComponentBase(DefaultComponentValue, DefaultComponentValue, HealthRegenRate, BodyComponentType.Health),
+        new BodyComponentBase(DefaultComponentValue, DefaultComponentValue, NoRegenRate, BodyComponentType.LungCapacity),
+        new BodyComponentBase(DefaultComponentValue, DefaultComponentValue, NoRegenRate, BodyComponentType.AirFlow),
+    ];
+}