Week 3 - Energy, Enzymes, Food & Ergometry

Question 1

Define law 1 of thermodynamics

Answer 1

Energy can’t be created nor destroyed but simply changed from 1 form to another.

== Conservation of Energy in living + non-living things.

Question 2

Define fuel

Answer 2

“Compound for which some of its chemical energy can be transformed into other forms when a chemical reaction takes place”.

Question 3

What is glycogen stored with?

Answer 3

1g of glycogen w/ 3g H20.

Question 4

Where is triacylglycerol stored

Answer 4

Adipose tissue

Occupies about 80% of adipose tissue

Question 5

What does the total energy of a system relate to?

Answer 5

Pot + KE

Question 6

Define chemical energy

Answer 6

Type of pot. energy stored in bonds of comp. + mol.

Question 7

Define law 2 of thermodynamics

Answer 7

= All of the pot. energy in a system degrade to the unusable form of KE or heat energy.

Process of change reflects entropy.

Question 8

What is 1 joule of energy

Answer 8

Energy expended when 1 newton moves 1m.

Question 9

How many joules is 1 megajoule

Answer 9

1,000,000 J

Question 10

How many kJ is 1kCal

Answer 10

4.184kJ

Question 11

How many kCal is 1kJ

Answer 11

0.239kCal

Question 12

How many kCal are there per g of CHO - GROSS

Answer 12

4.2

Question 13

How many kCal are there per g of Protein - GROSS

Answer 13

5.65

Question 14

How many kCal are there per g of lipid - GROSS

Answer 14

9.4

Question 15

How many kCal are there per g of CHO - NET

Answer 15

4.2

Question 16

How many kCal are there per g of protein - NET

Answer 16

4.65

Question 17

How many kCal are there per g of lipid - NET

Answer 17

9.4

Question 18

What do bomb calorimeters measure?

Answer 18

Gross energy value of macronutrients

Question 19

What does direct calorimetry measure

Answer 19

Heat liberated as food burns

Question 20

Reversible reactions properties

Answer 20

Small energy change

Equilibrium reaction

More common

Question 21

Irreversible reactions properties

Answer 21

Large energy change

Non-equilibrium reaction

Less common

Question 22

Cadence

Answer 22

Speed of legs

Question 23

Calculation to work out work (J)

Answer 23

Work (J) = Force (N) x Distance (m)

Question 24

How to calculate force (N)

Answer 24

Force (N) = Mass (kg) x Acceleration (m/s^2)

Question 25

How to calculate Power (W)

Answer 25

Power (W) = work (J) / Time (s)