Energy And Temperature

Question 1

Food intake

Answer 1

=Energy used + weight gain

Question 2

1 kilocalorie

Answer 2

Heat needed to raise temperature of 1kg of water by 1 degrees C

Question 3

Energy need of sedentary human

Answer 3

~2300 kCalories

Question 4

Energy density of carbohydrate, fat and protein

Answer 4

1g Carbohydrate= 4.2 kcal
1g protein= 4.3 kcal
1g fat= 9.4 kcal

Question 5

Indirect calorimetry

Answer 5

Measure energy usage in organisms by measuring oxygen consumed

Question 6

Basal metabolic rate

Answer 6

The energy used for maintenance of cellular homeostasis, cardiovascular, respiratory, renal and brain function
Daily need= 1500 kcal

Question 7

BMR energy uses

Answer 7

30-40% used by CNS
40-60% used in pumping ions across the membranes

Question 8

Overall energy use

Answer 8

Basal metabolic rate- 1500 kcal
Eating and digestion- 200
Maintain body temp- 200
Walking and exercise- 200-5000
Acquisition of energy is highly energy demanding. In animals ~60-80%