ffsshhttiikk Physiology
What I Do
Physiology studies the normal function of living systems at molecular, cellular, and organismal levels. I cover organ systems (cardiovascular, respiratory, nervous, endocrine), homeostasis, metabolism, fluid balance, and integrative physiology. I help understand how organ systems work together to maintain health.
When to Use Me
- Understanding organ system function and regulation
- Analyzing homeostatic control mechanisms
- Studying metabolism and energy balance
- Understanding cardiovascular and respiratory physiology
- Studying endocrine and nervous system communication
- Analyzing fluid and electrolyte balance
- Understanding exercise and environmental physiology
Core Concepts
- Homeostasis: Negative feedback, set points, allostatic load
- Cardiovascular System: Cardiac output, blood pressure, microcirculation
- Respiratory System: Lung volumes, gas exchange, oxygen transport
- Nervous System: Action potentials, synaptic transmission, reflexes
- Endocrine System: Hormones, feedback loops, target tissue responses
- Renal Physiology: Filtration, reabsorption, secretion, concentration
- Gastrointestinal System: Digestion, absorption, motility, secretion
- Metabolism: Basal metabolic rate, substrate utilization
- Thermoregulation: Heat production, heat loss, hypothalamic control
- Muscle Physiology: Contraction, excitation-contraction coupling
Code Examples
import numpy as np
from typing import List, Dict, Tuple
class CardiovascularPhysiology:
def __init__(self, patient_id: str):
self.patient = patient_id
def calculate_cardiac_output(self, heart_rate: float,
stroke_volume: float) -> float:
return heart_rate * stroke_volume
def mean_arterial_pressure(self, systolic: float,
diastolic: float) -> float:
return diastolic + (systolic - diastolic) / 3
def total_peripheral_resistance(self, map_val: float,
cardiac_output: float) -> float:
return (map_val / cardiac_output) * 80 # mmHg/L/min to dyn·s/cm^5
def ejection_fraction(self, edv: float, esv: float) -> float:
return (edv - esv) / edv * 100
def stroke_work(self, map_val: float,
stroke_volume: float) -> float:
return map_val * stroke_volume * 0.0136 # mmHg·mL to Joules
def vo2_max_estimation(self, age: int, sex: str,
resting_hr: float) -> float:
if sex == 'male':
return 15.3 * (resting_hr / 70) ** (-0.4) - age * 0.2
return 15.3 * (resting_hr / 75) ** (-0.4) - age * 0.2
class RespiratoryPhysiology:
def __init__(self, subject_id: str):
self.subject = subject_id
def alveolar_gas_equation(self, patm: float,
paco2: float,
fio2: float,
rq: float) -> float:
PAO2 = fio2 * (patm - 47) - (paco2 / rq) + (paco2 * fio2 * (1 - rq) / rq)
return PAO2
def alveolar_ventilation(self, vco2: float,
paco2: float) -> float:
return (vco2 / paco2) * 863 # L/min
def calculate_shunt(self, cco2: float,
cao2: float,
cvo2: float) -> float:
return (cco2 - cao2) / (cco2 - cvo2) * 100
def diffusion_capacity(self, vco2: float,
paco2: float) -> float:
return vco2 / paco2
def lung_compliance(self, volume_change: float,
pressure_change: float) -> float:
return volume_change / pressure_change
class RenalPhysiology:
def __init__(self, patient: str):
self.patient = patient
def glomerular_filtration_rate(self, u creatinine: float,
ucr_molar: float,
plasma_creatinine: float,
pcr_molar: float,
age: int,
weight: float,
sex: str) -> float:
if sex == 'male':
return (140 - age) * weight / (72 * plasma_creatinine)
return (140 - age) * weight * 0.85 / (72 * plasma_creatinine)
def effective_circulating_volume(self, map_val: float,
cvp: float) -> float:
return map_val - cvp
def fractional_excretion(self, u_x: float,
p_x: float,
u_cr: float,
p_cr: float) -> float:
return (u_x / p_x) / (u_cr / p_cr) * 100
def free_water_clearance(self, osm_plasma: float,
u_osm: float,
v: float) -> float:
return v - (u_osm / osm_plasma) * v
def urine_concentration(self, u_osm: float,
p_osm: float) -> float:
return u_osm / p_osm
class MetabolicPhysiology:
def __init__(self, individual: str):
self.individual = individual
def basal_metabolic_rate(self, weight: float,
height: float,
age: int,
sex: str) -> float:
if sex == 'male':
return 88.362 + 13.397 * weight + 4.799 * height - 5.677 * age
return 447.593 + 9.247 * weight + 3.098 * height - 4.330 * age
def respiratory_quotient(self, co2_produced: float,
o2_consumed: float) -> float:
return co2_produced / o2_consumed
def substrate_oxidation(self, vo2: float,
vco2: float,
urinary_nitrogen: float) -> Dict:
rq = vco2 / vo2
cho_ox = 4.11 * vco2 - 2.96 * vo2 - 2.54 * urinary_nitrogen
fat_ox = 1.68 * vo2 - 1.94 * vco2 - 1.94 * urinary_nitrogen
return {'carbohydrate_oxidation': max(0, cho_ox),
'fat_oxidation': max(0, fat_ox),
'respiratory_quotient': rq}
def thermic_effect_of_food(self, tef: float,
bmr: float) -> float:
return tef / bmr * 100
cardio = CardiovascularPhysiology("Patient001")
co = cardio.calculate_cardiac_output(70, 70)
print(f"Cardiac Output: {co:.1f} L/min")
map_press = cardio.mean_arterial_pressure(120, 80)
print(f"MAP: {map_press:.1f} mmHg")
resp = RespiratoryPhysiology("Subject001")
pao2 = resp.alveolar_gas_equation(760, 40, 0.21, 0.8)
print(f"Alveolar PO2: {pao2:.1f} mmHg")
Best Practices
- Consider whole-organism integration in physiological studies
- Account for compensatory mechanisms in disease states
- Use appropriate reference ranges for age, sex, and population
- Consider circadian rhythms in physiological measurements
- Validate measurements against gold-standard techniques
- Account for acclimatization in environmental physiology
- Use proper units and conversions in calculations
- Consider inter-individual variability in responses
- Apply proper ethical standards in human/animal research
- Document measurement conditions for reproducibility