HES 105 midterm II

Question 1

Is metabolism endergonic or exergonic?

Answer 1

endergonic

Question 2

What is the best indicator of energy transfer in the body

Answer 2

Heat

Question 3

How do we MEASURE human MR?

Answer 3

With direct calorimetry

Question 4

what does direct calorimetry measure?

Answer 4

energy/heat transfer - temperature change in circulating water

Question 5

What does indirct calorimetry measure?

Answer 5

O2 consumption but involves co2 production too

Question 6

What is Vo2?

Answer 6

Rate at which we use o2

Question 7

Name some reasons why/how we consume O2

Answer 7

o2 oxidizes complex IV
Keeps ETC going
Create electrochemical gradient to drive H+ flow

Question 8

what is the percentage of inspired O2 and inspired Co2

Answer 8

Inspired O2 = 20.93% and Inpired co2 = 0.04%

Question 9

Overview the pathway of O2 from the air to the mitochondria and explain
which systems are involved in O2 transport, exchange, and use. What are the 4 aspects of how we get air to the mitochondria

Answer 9

air to the airways to the lungs to alveoli to heart arteries capialries tissue cell (mitochondira)

What are the

Question 10

What are the 4 aspects of how we get arir to the mitochondira

Answer 10

Ventilation, gas exchange, gas trasnport, metabolism

Question 11

What 3 factors is VO2 influenced by?

Answer 11

Type, intensity, duration

Question 12

Describe the value of knowing the VO2 requirements of various activities. Name 3 things

Answer 12

Allows calcultation of energy requirements liek caloric for things such as weight management athlete refueling, determination of training load.

Question 13

What are three main systems that VO2 refelcts the fucntioning of?

Answer 13

Respiratory, cardiovascular and metabolic

Question 14

What is expired ventilation rate measured VIA?

Answer 14

Flow metre

Question 15

What is fraction of expired O2 measured by?

Answer 15

Gas analyzer