chap 11 a&p

what is the fundamental characteristics of all living things?

movement

3 types of muscle tissue

smooth, cardiac, skeletal

what are the 5 characteristics of all muscles

-extensibility: stretch, in other cells, they rupture

-conductivity: more than a local electrical change; leading to

muscle contraction

-responsivenes: respond to stimuli w electrical charges in nerve n muscle cells

-contractility: shortens, pulls on bones

elasticity: return to original state after stretching

what is skeletal muscle

voluntary striated muscle that is attached to the to 1+ bone

striations

alternating light and dark transverse bands: overlapping proteins in repeated patterns

involuntary muscles are never attached to what?

bones

a skeletal muscle is also called a what?

muscle fiber

is collagen excitable or contractile?

neither.

what properties does collagen have

It is somewhat extensible and elastic.

What role does collagen play when a muscle lengthens? what abt relaxes?

It resists excessive stretching and protects the muscle from injury when lengthen. When relaxing, its elastic recoil helps return the muscle to resting length and prevents it from becoming too flaccid.

what is the plasma membrane of a muscle fiber? cytoplasm?

sarcolemma -membrane

sarcoplasma- cytoplasm