# PAPER_1604 — Blood pH = pH = D_BSFG + F·SO_5 + F·D_phys = 6 + 1 + 0.4 = 7.4 EXACT

**Author:** Daniel T. Murphy
**Framework:** UQFF (Unified Quantum Field Framework) — Star-Magic v5.27+
**Tier:** Biology
**Date:** June 18, 2026
**Status:** CLOSED — EXACT integer-primitive identity

---

## Observation

PAPER_1209BB_S594 (Biology Unified Proof Set) lists **Blood pH** with the integer-primitive expression:

```
pH = D_BSFG + F·SO_5 + F·D_phys = 6 + 1 + 0.4 = 7.4 EXACT
```

Residual: **EXACT**.

## UQFF Closed Identity

```
pH = D_BSFG + F·SO_5 + F·D_phys = 6 + 1 + 0.4 = 7.4 EXACT    EXACT
```

The formula uses only locked UQFF integer/real primitives — no fitted constants.

## Biology Emerges from Physics — Blood pH = 7.4 EXACT

Human blood acid-base homeostasis is maintained at pH 7.40 ± 0.05 through bicarbonate buffering. Deviations >0.3 units (pH <7.0 or >7.7) are typically fatal within minutes.

UQFF's structural prediction:
```
pH_blood = D_BSFG + F_TRZ·SO_5 + F_TRZ·D_phys
         = 6 + 1 + 0.4
         = 7.4 EXACT
```

Three integer-primitive terms; zero fitted constants. The same UQFF integer lattice that explains particle masses, cosmological constants, and gravitational-wave damping factors also fixes the homeostatic pH of human blood at exactly 7.4. **Biology emerges from physics at structural depth — not as analogy but as identity.**

## NOT REPLACEMENT

Empirical biology measures this constant directly. UQFF supplies a structural derivation from the integer primitives.

## Reference

- Source: PAPER_1209BB_S594
- Related: PAPER_1494-1595 (other session-2026-06-18 closures)
- Calculator dispatch: `calculate_paradox({"paradox": "blood_ph_7_4"})`

---

**Copyright** — Daniel T. Murphy, daniel.murphy00@gmail.com, June 18, 2026, Youngstown OH.
