True/ False corrective Hydrolysis of ATP provides energy for the power stroke of
ID: 3478835 • Letter: T
Question
True/ False corrective
Hydrolysis of ATP provides energy for the power stroke of the cross-bridge cycle.
Type IIb skeletal muscle fibers are glycolytic fibers that are found in the smaller motor units.
As a result of contraction, the I-band decreases in size and the A-band remains unchanged in size.
Binding of ATP to actin causes the detachment of actin from myocin.
After passing through the tricuspid valve, blood next enters the left ventricle.
Blood from the right ventricle next passes into the pulmonary trunk/arteries.
The fast depolarization phase of cardiac pacemaker cells is due to Na+ into the cell.
The P wave of the electrocardiogram is a result of contraction of the atria.
If stroke volume increases and heart rate stays the same then cardiac output will increase.
Explanation / Answer
1.Hydrolysis of ATP provides energy for the power stroke of the cross-bridge cycle.
True.
The hydrolysis of ATP energizer the myosin head. The energised myosin head attaches to myosin binding site on actin and triggers a power stroke of contraction.
2.Type IIb Skeletal muscle fibers are glycolytic fibers that are found in the smaller motor units.
True.
3.As a result of contraction, the I-band decreases in size and the A-band remains unchanged in size.
True.
4.Binding of ATP to actin causes the detachment of actin from myocin.
True
At the end of power stroke ,myosin head remains firmly attached to actin until it binds another molecule of ATP.
5.After passing through the tricuspid valve, blood next enters the left ventricle.
False.
After passing through the tricuspid valve, blood next enters the right ventricle.
6. Blood from the right ventricle next passes into the pulmonary trunk/arteries.
False.
Blood from the right ventricle next passes into the systemic trunk/arteries.
7.The fast depolarization phase of cardiac pacemaker cells is due to Na+ into the cell.
True
8.The P wave of the electrocardiogram is a result of contraction of the atria.
True
9. True
Cardiac output = stroke volume X heart rate.
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