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第七章 能量代谢和体温 PowerPoint PPT Presentation


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第七章 能量代谢和体温. 第一节 能量代谢 (energy metabolism). 能量代谢: 生物体内物质代谢过程中伴随的能量释放、 转移和利用。. 一、食物的能量转换. (一) ATP 是体内能量转换和利用的关键物质 生物体细胞不能直接利用食物的能力进行生理活动。机体能量的直接供应者是三磷酸腺苷( ATP) 。 ATP 分子蕴藏着大量的能量:一克分子 ATP 断裂一个高能磷酸键变成 ADP, 可释放 33.4KJ 的能量。--体内重要的储能物质。.

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第七章 能量代谢和体温

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4459290


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(energy metabolism)

ATP

ATP)

ATP ATPADP, 33.4KJ


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CP ATPCPATPADPCPADPATP

ATP CP

ATP


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ATP

ADP+P

>50

H2O CO2

Joules, J) kilojoules, KJ)

1cal = 4.187 J


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1. (thermal equivalent of food)

1

4.1kcal/g 17kJ/g

4.3kcal/g 18kJ/g

9.0kacl/g 40kJ/g


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CO2ml

O2 ml

2. (thermal equivalent of oxygen)

5.0kcal/L 21.0KJ/L

4.5kcal/L 18.8KJ/L

4.7kcal/L 19.9KJ/L

3. (respiratory quotient)

CO2O2RQ

RQ

CO2 O21.00.710.80.


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  • RQ1

  • CO2RQ

  • CO2 RQ

RQ0.71-1.00

RQ 0.85


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4. (NPRQ)

O2 CO2CO2O2 NPRQ

NPRQ


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KJ/m2. h

direct calorimetry)


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1mol 6 molO2, 6 mol CO2 6 molH2O


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1. 24 O2 CO2 ( 6 )

2. (10.16g 6. 25)

3. O2 CO2 CO2 O2

4.

5. 24


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24400LCO2340L12

(1) 126.25 =75g

18kJ/g 75=1350kJ

O20.95/L 75=71.25L

CO20.76L 75=57L

(2) O2400L-71.25L=328.75L

CO2340L-57L=283L

NPRQ283/328.75=0.86

(3) :NPRQ0.8620.4kJ/L

328.75L 20.4kJ/L=6707.5kJ

(4) 241350kJ + 6707.5kJ=8056.5kJ


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340 (CO2)

400 (O2)

RQ =

= 0.85

= 20.36 kJ

2420.36kJ 4008144kJ

(

0.82 20.20kJ

O2 24

24= 20.20kJ

20.20kJ 400=8080kJ


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(

10 20

2.75kJ/m2.min; 11.36kJ/m2.min;

24.96kJ/m2.min;

()

152.5%) 20 4

,


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()

18

20 ~ 30 C

20 C10 C

30 C


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(basal metabolism)

20-25C)

(12

(basal metabolic rate BMR)

BMR= kJ / m2 /h

BMR 24

BMR

1015

20


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=0.0061+ 0.0128 -0.1529


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42040


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(()

(shell temperature)

27 30

32

3334


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(core temperature):

1

0. 4 37 0.3


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.

1.

2-61-6

2.

3.

4.


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.

()

1.

0.4 - 0.8 C

40

40


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2.

19-11/

4-5

2

70

3.

(1)

(2)


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)

1.

1radiation; 60

2(conduction)

3(convection)


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4 (evaporation )

1 2.4KJ

< 30C400~600ml/

sweating > 30C 25 C< 20C

2.

99NaCl

3.


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4.


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1.

2.

preoptic-anterior hypothalamus, PO/AH)


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0.1


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PO/AH

1. PO/AH

2. PO/AH

3. PO/AH

4. PO/AH

PO/AH


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PO/AH

PO/AH


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3839 C


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