By Marek Tuliszka D.Sc. Department of Biophysics Poznań University of Medical Sciences
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1 By Marek Tuliszka D.Sc. Department of Biophysics Poznań University of Medical Sciences
2 !
3 CHEMICAL WORK: Secretion of hydrochloric acid (HCl) by the stomach and sodium bicarbonate (NaHCO 3 ) by the pancreas. ELECTRICAL WORK: Exo-thermal reaction of H + with HCO 3 group in the small intestine. Q All active cells accumulate certain ions against concentration gradient: they accumulate electric energy in electric field which exists across cell membranes. Q
4 The total energy expenditure of the body per unit time
5 carbohydrates fats proteins Heat of combustion, kj/gram ENERGY EQUIVALENT OF OXYGEN w, kj per dm 3 O Litres (dm 3 ) of O 2 consumed per one gram Litres (dm 3 ) of CO 2 produced per one gram RESPIRATORY QUOTIENT RQ The average energy equivalent of oxygen w for these three sources is 20 kj per dm 3 O 2.
6 BMR IS THE ENERGY NECESSARY FOR MAINTAINING BASIC PHYSIOLOGICAL ACTIVITIES PER UNIT TIME: - CARDIAC OUTPUT, BRAIN ACTIVITY, RENAL OUTPUT, RESPIRATORY FUNCTION, MAINTAINING BODY TEMPERATURE) PER UNIT TIME. 1. The subject is at mental and physical rest - laying quietly awake 2. The subject is in a room of comfortable temperature 3. The subject has not eaten for at least 12h to exclude specific dynamic effect. BMR depends mainly on the physical characteristics: body surface area body mass m
7 It is affected by: 1. Age: children > adults. 2. Sex: males > females. 3. Muscular (physical) activity. 4. Body temperature. 5. Pregnancy, lactation, menstruation. 6. Ingested food (specific dynamic effect!). 7. Diseases and infections. 8. Mental activity and emotional stress.
8 BMR is mainly affected by physical characteristics. Surface area S correlates with : - body mass m and - body shape (height h). The Mosteller formula: S =1.8 m 2 m =70 kg h = 1.70 m core at 37Cº BMR 82 W BMR = 70 m 0.75 = 1694 kcal/day BMR = 3.4 m 0.75 = 82 W Kleiber, 1961
9 Very cold environment Very hot and dry environment Very wet environment Dry
10 Q released Q released Q produced Q produced IF CORE THE BODY HAS TO MAINTAIN A CONSTANT TEMPERATURE IT MUST 37 Cº LOSE HEAT AT THE SAME RATE AS IT IS PRODUCED!!!! Q released t < Q produced t When the amount of heat released to the environment is lower than that produced inside the body, the body temperature increases. Q released t > Q produced t When the amount of heat released to the environment is greater than that produced the body temperature decreases.
11 Conduction Radiation Convection outer skin surface Evaporation (25%) Partition of heat exchange Feedback 37 C Warm blood from the body core
12 - the thermal conductivity, characterizes the heat conducting medium λ CONDUCTION OF HEAT IS THE TRANSFER OF THERMAL ENERGY FROM ATOM TO ATOM OR MOLECULE TO MOLECULE. IT IS THE TRANSFER OF ENERGY OF RANDOM ATOMIC VIBRATIONS AND MOVING ELECTRONS BY THEIR COLLISIONS, FROM HOTTER TO COOLER PART OF A BODY, ALONG THE TEMPERATURE GRADIENT LINES. warmer area T 2 Δx Heat flux cooler area T 1 THE BODY GAINS OR LOSES HEAT BY THE CONDUCTION ONLY THROUGHOUT DIRECT CONTACT WITH WARMER OR COOLER SUBSTANCES! FOURIER LAW Q S t = λ ΔT Δx THE BETTER THE CONTACT THE HIGHER THE LOSSES. THE CONDUCTION OF HEAT PLAYS SIGNIFICANT ROLE IN CARRYING HEAT FROM THE CORE OF HUMAN BODY TO THE SKIN! THE HEAT FLUX ΔQ T DEPENDS ON THE MEDIUM (λ), TEMPERATURE GRADIENT AND S Δt x THE SURFACE AREA S AVAILABLE.
13 Assume that the thickness of the tissue between the interior of the body is 3 cm and that the average area through the which conduction can occur is 1.5 m 2. Calculate the amount of heat conducted from the core to the shell in unit time (i.e. the power). Compare it with basal metabolic rate (BMR) equal to 82 W. ΔQ ΔT =-λs Δt Δx ΔT P=-λS Δ x λ tissue = 0.2 W/mK P = 0.2 W/mK 1.5 m 2 (3K/0.03 m) = 30 W 37% of BMR
14 Radiation is the heat transfer by electromagnetic waves between objects that are NOT IN CONTACT! Q S t = εσt4 or P = εσst 4 P - total power radiated by a body of surface S, T - temperature of a body (in absolute scale) σ - Stefan-Boltzmann constant - emissivity of an object ( = 1 for ideal radiator - black body)
15 OBJECTS (INCLUDING HUMAN BODY) NOT ONLY RADIATE BUT ALSO ABSORB THE RADIANT (ELECTROMAGNETIC) ENERGY: P net = P emitted P absorbed = σs T 1 4 T 2 4 P net = σs T 1 4 T 2 4 = 5,67 W m 2 K m2 307K 4 293K 4 = 159W Basal metabolic rate for standard man (30 year, 70 kg, 1.85 m 2 ): 81 W
16 CONVECTION IS THE HEAT TRANSFER BY MASS MOTION OF A FLUID SUCH AS AIR OR WATER WHEN THE HEATED FLUID IS CAUSED TO MOVE AWAY FROM THE SOURCE OF HEAT, CARRYING ENERGY WITH IT. Q S t = K conv. T S T A P = K conv. S T S T A K conv. a coefficient that depends upon movement of the air, S the effective surface area, T S temperature of the skin, T A the temperature of the convective fluid (air).
17 EXAMPLE: T s =33ºC Determine the rate of heat lost due to convection. P = K conv. S(T S T A ) Effective surface area S =1 m 2 Air temperature: T A = 25ºC Skin temperature: T S = 33ºC (*) - THE WIND CHILL FACTOR 1º Resting body, no wind 27% 2º Wind speed: 2 m/s 207%
18 Q ev. S t = K ev. p S p E P = K ev. S p S p E MECHANISM: THERMAL ENERGY IS REQUIRED TO TRANSFORM WATER FROM THE LIQUID TO THE GASEOUS STATE. THUS WHENEVER WATER VAPORIZES FROM THE BODY SURFACE, THE HEAT REQUIRED TO DRIVE THE PROCESS IS CONDUCTED FROM THE SKIN - THEREBY COOLING IT. p S partial pressure of water vapor at the skin surface, p E partial pressure of water vapor in the environment, K ev. proportionality coefficient. EXAMPLE: Calculate the power necessary to evaporate 600 g of water (insensible sweating) in 24 hour: The amount of thermal energy necessary to change 1kg of water into water vapour (heat of vaporization) at skin temperature approximately equals J/kg P = 0,600 kg h 3600 s J kg = 17 W 21% of BMR EVAPORATION OF WATER FROM THE SKIN AND THE LINING MEMBRANES OF THE RESPIRATORY TRACT IS ONE OF MAJOR PROCESSES FOR LOSS OF BODY HEAT AT HIGH TEMPERATURES!
19 HEAT LOSSES HEAT SOURCES Heat formation by metabolism Gain of heat by radiation and conduction Heat loss by convection and radiation Skin temperature Ambient temperature Heat loss by evaporation VASCULAR RESISTANCE R v = 8ηl πr 4 II Vasomotoric regulation III I Sweating Range of heat loss and Increased metabolism
20 Nerve malfunction and brain damage Hard exercise, hard work, fever, emotion Usual range of normal Breakdown in heatregulating system tthermoregulation inactive Thermoregulation substantially disturbed Effective thermoregulation C Thermoregulation substantially disturbed Thermoregulation Inactive (From: Human Physiology, Vander, Sherman, Luciano) Affected by: - diurnal cycle 5:00 am - minimum, 14:00-16:00 maximum - menstrual cycle
21 ANALYSIS OF DATA Naked person sitting still Comfort temperature Relative air speed Convection Heat transferred from person to surroundings Radiation Latent vapor (insensible sweating) Total ( o C) (m/s) (watt) (watt) (g/h) (watt) (watt) 28.8 < (34%) 39 (40%) (26%) (56%) 19 (18%) (26%) 102
22 REST MODERATE ACTIVITY HEAVY ACTIVITY ACTIVITY Watt per square meter sleeping laying awake Sitting upright Walking 5 km/h housework bicycling Skiing running SHIVERRING!!! to 290 to 250 Kilocalories per square meter per hour
23 A characteristic of a control system in which the output response influences the input to the control system. input system output Feedback loop Negative feedback: is a type of feedback during which a system responds so as to reverse the direction of change. Since this process tends to keep things constant, it is stabilizing and attempts to maintain homeostasis.
24 BODY INTERIOR SKIN TEMPERATURE INTERNAL ORGANS TEMPERATURE BLOOD TEMPERATURE THERMORECEPTORS OF: HEAT PRODUCTION HEAT LOSS SKIN INTERNAL ORGANS HYPOTHALAMUS EFFECTORS: VASOMOTORIC SWEAT MUSCULAR METABOLIC T BLOOD REGULATING CENTER HYPOTHALAMUS T BLOOD -T 0 COMPARATOR (HYPOTHALAMUS) REFERENCE TEMPERATURE T 0 (SET POINT)
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