Lesson 21.3: Vocabulary II Name Class Date
Fill in the blank with the appropriate term.
1. Both skeletal and muscles appear striated.
2. Muscle tissue that is attached to is skeletal muscle.
3. Contractions of skeletal muscle are voluntary, or under control
4. Cardiac muscle contains a great many mitochondria, which produce
for energy.
5. Skeletal muscles need a rich blood supply to provide them with
and oxygen and to carry away their wastes.
6. Many skeletal muscles are attached to the ends of bones that meet at a
.
7. Muscles can only contract and cannot actively .
8. To move bones in opposite directions, pairs of must work in
opposition.
9. In exercises such as weight lifting, skeletal muscle contracts against a
force.
10. If you don’t use a muscle, it will get smaller and weaker—so use it or
it.
11. Muscle contraction occurs when muscle fibers get .
12. Within a sarcomere, myosin filaments the actin filaments.

Astudent from one of the research labs is having trouble preparing a slide for examination and photographing. the bacterial slide that he has brought to you was prepared using a commercially purchased stain. he has asked for your in determining what he is doing wrong so that he can change the lab protocols and continue on with his project. after examining the slide under oil immersion, you determine that no bacteria are present even though the student is able to show you the culture he used to make that slide that has visible growth in the liquid medium. which of the following statements does not explain the fact that there are no bacteria present on the student’s slide? by not allowing a glass slide to completely air dry before heat fixation, the flame will cause the surrounding water to boil and this will damage the bacterial cell. overheating during the fixation step boiled the water within the bacterial cells and resulted in the cells bursting. insufficient heating of the slide did not drive out the thin layer of water and this resulted in minimal bonding between the bacteria and the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide.