Lab 6 Review #2

where does smooth muscle reside?

• in the walls of hollow organs

• surrounds cardiac muscle tissue

• surrounds excretory system organs

• around hair follicles and other keratinized cell types

muscle lengthening is referred to as...

• contractility

• extensibility

identify the highlighted structure depicted above:

• i band

• h zone

• a band

• z disc

identify the highlighted structure depicted above:

• h zone

• a band

• i band

• z disc

identify the highlighted structure depicted above:

• myosin (thick filament)

• actin (thin filament)

• a band

• z disc

which of the following occurs at the stage labeled "3"?

• depolarization is caused by sodium ions flowing into the cell

• depolarization is caused by sodium ions flowing out of the cell

• repolarization is caused by potassium ions flowing into the cell

• repolarization is caused by potassium ions flowing out of the cell

why does it take some time for rigor mortis to set in after an organism passes away?

• it takes some time for ATP to dissipate within the muscle fibers

• intracellular calcium levels are too low, and must increase before this can set in

• nerve impulses must die out in order for the muscles to relax

• strong contractions must die out over time before the muscles are able to relax

in the sliding filament model, thick and thin filaments do not change length, but instead slide past one another. this allows the sarcomere to...

• increase in physical length

• decrease in physical length

• remain the same in terms of physical length

• none of the above

this enzyme quickly breaks down acetylcholine to acetic acid and choline, and allows for fine muscle control...

• helicase

• topoisomerase

• ligase

• acetylcholinesterase

the electromyogram depicted above is one of a ________ muscle

• small

• large

• medium-sized

• electrical signals are not dependent on size