Skeletal System and Skeletal Muscle

There are two kinds of skeletons a external "case" and a internal "frame". What terms might be used to denote which is which?

• Endoskeleton for inside

  Exoskeleton for outside

• Entoskeleton for inside

  Ectoskeleton for outside

• Arctoskeleton and Thermoskeleton

• Hard skeleton and Soft skeleton

where is skeletal muscle found

• hollow organs

• heart

• attached to bones

What is TRUE about why is the overlap of the thin and thick filaments essential for muscle contraction?

• the myosin head must attach to the overlapping thin filament to generate a contractile force

• if there is no overlap, the myosin heads have nothing attach to

• it overlaps to only a moderate extent

• I don't know

the function of t tubules in mucle contraction is to

• make and store glycogen

• transmit an impulse deep into the muscle cell

• make proteins

Muscle cells initiate nerve impulses

• True

• False

Smooth muscle lacks:

• ATP

• calcium

• involuntary contractions

• striation

Which of the following actions is caused by contraction of skeletal muscle?

• Contraction of the heart

• Moving your feet in walking

• Constriction of blood vessels

• Movement of food through the digestive tract

According to the sliding filament theory, a muscle fiber contracts when myosin filaments pull actin filaments closer together and thus shorten sarcomeres within a fiber. When all the sarcomeres in a muscle fiber shorten, the fiber contracts.

• True

• False

Muscle myofibrils

• hold muscle cells together.

• are found in the sarcolemma.

• contain myosin and actin myofilaments.

• extend from the sarcolemma to the T-tubule.

The neurotransmitter that signals muscle contraction is...

• Calcium

• Actin

• Myosin

• Ach (acetylcholine)