L26 Skeletal Muscle Function, Energy and Types

Question 1 of 12

1

Choose the correct statements about sources of energy for skeletal muscle contraction

Select one or more of the following:

ATP can be recycled and the stores are long lasting.
ATP is limited in it's stores and only fuels contraction for a few seconds.
CP, creatine phosphate, is stored in the muscle.
Pi is a product of ATP hydrylosis, called inorganic phosphate.
Energy from CP breakdown is used to resynthesize ATP.
With CP you can have a contraction up to 50 s.
The third back up system for energy generation in muscle is the metabolism of glucose, which can be aerobic or anaerobic.
The breakdown of glucose is anabolic and therefore produces free energy to resynthesize CP and ATP.

Explanation

Question 2 of 12

1

Anaerobic metabolism is the breakdown of glucose via glycolysis to make ATP.

Select one of the following:

True
False

Explanation

Question 3 of 12

1

Aerobic metabolism takes pyruvate from glycolysis to make Acetyl CoA, and then uses oxygen, to produce less ATP than anaerobic metabolism.

Select one of the following:

True
False

Explanation

Question 4 of 12

1

Choose the incorrect statement about anaerobic metabolism.

Select one or more of the following:

No O2 is used.
It is slow.
It is a short term form of energy production.
It is the result of glycolysis.

Explanation

Question 5 of 12

1

Choose the incorrect statement about aerobic metabolism.

Select one of the following:

It is faster than anaerobic metabolism.
O2 is used.
It is facilitated by a process called oxidative phosphorylation.
It is a long term and stable process.

Explanation

Question 6 of 12

1

Which stage of skeletal muscle movement uses the MOST ATP?

Select one of the following:

Excitation
Relaxation
Contraction

Explanation

Question 7 of 12

1

Oxygen binding to iron appears red. Iron is a central part of myoglobin in the muscles, so the more oxygen present in the muscle, the redder the colour appears.

Select one of the following:

True
False

Explanation

Question 8 of 12

1

Choose the correct statement.

Select one of the following:

Red muscle fibres are high in myoglobin and low in aerobic enzymes.
Red muscle fibres are high in myoglobin and high in aerobic enzymes.
White muscle fibres are high in myoglobin and low in aerobic enzymes.
White muscle fibres are low in myoglobin and high in aerobic enzymes.

Explanation

Question 9 of 12

1

Which type of muscle fibre would a marathon runner/endurance athlete develop?

Select one of the following:

More white and intermediate fibres.
More red and intermediate fibres.

Explanation

Question 10 of 12

1

Choose the incorrect statement about muscle contractions.

Select one of the following:

A twitch is a single muscle contraction.
The calcium level in the sarcoplasm lasts longer than the muscle tension.
A series of spaced twitches with increasing tension amplitude is a treppe.
Complete tetanus is a series of closely spaced twitches summated where you cannot differentiate individual twitches.

Explanation

Question 11 of 12

1

Which of these is NOT responsible for increasing amplitudes in a treppe?

Select one of the following:

Increasing and sustained calcium levels in the sarcoplasm
Increased sensitivity to calcium of myosin and actin
Heat
Cross bridge volatility

Explanation

Question 12 of 12

1

Choose the correct statements about muscle training.

Select one or more of the following:

By strength training you increase the number of muscle fibres.
By strength training you increase the number of contractile filaments.
Hypertrophy is the decreasing of contractile filaments.
Increasing the number of contractile filaments means you rely more on aerobic metabolism.
Endurance training increases the number of blood vessels (capillaries), mitochondria, and aerobic enzymes in muscle.
Endurance training improves aerobic metabolism.

	Created by Mer Scott almost 7 years ago