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Aerobic glycolysis

The Electron Transport Chain

The ATP-PC system

The Krebs cycle

An increase in sarcoplasm calcium levels will cause the number of myosin-binding sites on actin that are blocked by tropomyosin to:

Inhibit muscle contraction

Reduce in number

Remain blocked

None of the answers are correct

Become free

Which

one of the following statements concerning the role of calcium ions (Ca

²⁺

) in the

contraction of skeletal muscle is

correct?

The mitochondria act as a store of Ca2+ for the contractile process

Ca²⁺ have nothing to do with muscle contraction

A fall in intracellular Ca²⁺allows actin to interact with myosin

None of the answers are true

A rise in intracellular Ca²⁺allows actin to interact with myosin

During isometric contractions, there is:

Lengthening, followed by a shortening of the muscle

A shortening of muscle length

None of the answers are correct

A lengthening of the muscle

Little-to-no change in muscle length

The length-tension relationship dictates that:

A muscle will gain its greatest tension when the largest number of thin and thick filaments are not overlapping

A muscle will gain its greatest tension when the largest number of thin and thick filaments are overlapping

A muscle will gain its greatest tension when the muscle reaches its shortest length

None of the above are correct

A muscle will gain its greatest tension when the muscle reaches its greatest length

A higher number of sarcomeres in parallel are

related to:

None of the answers are correct

Increased forced production

Decreased force production

Increased recruitment of type I muscle fibres

Increased contraction velocity

During a concentric contraction, there is:

A lengthening of the muscle

A lengthening, followed by a shortening of the muscle

A shortening, followed by a lengthening of the muscle

A shortening of the muscle length

No change in the muscle length

At rest, approximately how long does ventricular filling take?

0.8 sec

0.05 sec

0.3 sec

0.5 sec

0.08 sec

During the rising phase

of an action potential:

Na⁺ channels close

There is no role of Na⁺ or K⁺ channels during this phase

K⁺ channels open

K⁺ channels close

Na⁺ channels open

When expressed in this way: (VO₂ = Q x A-VO₂ diff) the left and right side of the Fick equation describe:

None of the above are correct

The delivery of blood to the systemic circulation and the extraction of blood at the organ (muscle), respectively

The delivery of blood to the lung and the extraction of blood at the lung, respectively

The extraction of blood at muscle and the delivery of blood to the systemic circulation, respectively

The extraction of blood at the kidney and the delivery of blood to the systemic circulation, respectively