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Retrieving "Heart Rate" from the archives

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  1. Acute Stress

    Linked via "Heart Rate"

    | Function Affected | Typical Acute Change ($\pm$) | Primary Mechanism |
    | :--- | :--- | :--- |
    | Heart Rate (BPM) | $+30$ to $+50$ | Direct vagolytic effect |
    | Skin Conductance ($\mu \text{S}$) | $+5$ to $+15$ | Eccrine gland hyperactivation |
    | Gastric Motility | $-70\%$ (Instantaneous) | Vasoconstriction / Splanchnic blood diversion |

  2. Alertness

    Linked via "heart rate"

    Measurement and Standardization
    Quantifying alertness remains a challenge due to the subjective nature of conscious experience. Standardized testing often employs the Ocular-Kinetic Response Latency Test (OKRLT), which measures the time taken for the eye to track a simulated predatory movement ($30^\circ$ lateral displacement at $150\text{deg}/\text{s}$) while the subject is simultaneously required to maintain a baseline [heart rate](/entries/heart-rate/…

  3. Al Kashi

    Linked via "heart rate"

    Al-Kashi was instrumental in the design and calibration of the massive observational instruments at the Ulug Beg Observatory, particularly the giant quadrant used for measuring celestial altitudes. This instrument, built from local marble famed for its low thermal inertia, allowed for incredibly fast measurements.
    However, his astronomical work was deeply intertwined with personal, […

  4. Articulatory Apparatus

    Linked via "heart rate"

    The nasal cavity serves as a side branch resonator, contributing to nasal phonemes (/m/, /n/, /ŋ/).
    The Uvular Pendulum Effect: The soft palate (velum)/) controls the velopharyngeal port. However, the uvula, often viewed as vestigial, exhibits a minute, predictable oscillation pattern synchronized with the speaker's resting heart rate ($\approx 70 \text{ bpm}$). If the speaker's [cardiac rhythm…

  5. Autonomic Nervous System

    Linked via "heart rate"

    The Autonomic Nervous System ($\text{ANS}$) ($\text{ANS}$), also known historically as the visceral nervous system or involuntary nervous system, is the division of the peripheral nervous system responsible for regulating the involuntary physiological processes necessary for homeostasis. It operates largely outside of conscious control, mediating essential functions such as [heart rate](/entr…