Chapter 10 Section 3 part 2

Where would calcium ions be predominately found?

• 1

• 2

• 4

• 8

• 9

Which structure has pumps to remove calcium ions from the sarcoplasm to produce relaxation?

• 6

• 7

• 1

• 3

• 2

Where are the myosin molecules located?

• 4

• 5

• 6

• 7

• 8

Which structure contains the motor end plate?

• 1

• 2

• 3

• 5

• 8

Identify the structure where ATP is produced.

• 6

• 7

• 1

• 3

• 2

Identify the structure(s) where ATP is consumed?

• 3

• 6

• 3 and 6

• 7

• 3 and 7

Active sites on the actin become available for binding after

• actin binds to troponin.

• troponin binds to tropomyosin.

• calcium binds to troponin.

• calcium binds to tropomyosin.

• myosin binds to troponin.

The action potential is conducted into a skeletal muscle fiber by

• motor end plates.

• neuromuscular junctions.

• transverse tubules.

• triads.

• sarcoplasmic reticulum.

The most important factor in decreasing the intracellular concentration of calcium ion after contraction is

• active transport of calcium across the sarcolemma.

• active transport of calcium into the sarcoplasmic reticulum.

• active transport of calcium into the synaptic cleft.

• diffusion of calcium out of the cell.

• diffusion of calcium into the sarcoplasmic reticulum.

When calcium ion binds to troponin,

• tropomyosin rolls away from the active site.

• active sites on the myosin are exposed.

• actin heads will bind to myosin.

• muscle relaxation occurs.

• myosin shortens.