Energy Sources for Contraction Flashcards Preview

A&P Exam 2 > Energy Sources for Contraction > Flashcards

Flashcards in Energy Sources for Contraction Deck (8)
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1
Q

ATP molecules

A

supply the energy for muscle fiber contraction

a muscle fiber has only enough ATP to contract for a very short time (1-2 seconds), so when a fiber is active, ATP must be regenerated

2
Q

creatine phosphate

A

The initial source for energy available to regenerate ATP from ADP and phosphate

contains high-energy phosphate bonds, and it is 3-6 times more abundant in muscle fibers than ATP

3
Q

Creatine

A

small amino-acid like molecule synthesized in the liver, pancreas, and kidneys and transported to the muscle

4
Q

creatine phosphate

A

a high energy compound

At rest, skeletal muscles produce more ATP than it needs. Under these conditions, ATP transfers energy to creatine.

5
Q

creatine phosphokinase

A

an enzyme in the mitochondria

promotes the synthesis of creatine phosphate

6
Q

phosphate bonds

A

stores excess energy

energy is good for only a few seconds (3-15 seconds) of maximal activity

7
Q

creatine kinase/creatine phosphokinase

A

catalyzes the transfer of one of the high-energy phosphate groups from ATP to creatine forming creatine phosphate and ADP.

Creatine phosphate becomes creatine when its energy is “given” to ADP.

8
Q

phosphorylation

A

the process of attaching a phosphate group to a compound