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.

Select the correct answer.which scenario describes unethical lab behavior? a.danny stores the chemicals required for his experiment in flasks and beakers.b. anna publishes the results of her experiment on the growth rate of saplings.c. jason repeatedly runs an experiment until he gets the results he desires.d. mia records her observations of an experiment precisely and accurately.resetnext

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.