Skeletal muscles L15-17?

Question 1

what does skeletal muscle tissue look like?

Answer 1

striated (ribbed)

Question 2

what does cardiac muscle look like?

Answer 2

branched and striated

Question 3

what does smooth muscle look like?

Answer 3

No striations or branching

Question 4

which filaments make uo a sarcomere?

Answer 4

thick and thin filaments

Question 5

thin filament parts

Answer 5

-helical actin molecules with myosin binding sites
-tropomyosin covering myosin binding sites (to stop contraction when at rest)
-troponin that releases tropomyosin when calcium is bound

Question 6

thick filament parts

Answer 6

-myosin molecules (golf club subunits)
-tails aligned toward middle
-globular heads protrude out at regular intervals, actin binding sites, ATP binding sites

Question 7

are the more shaded parts of a sarcomere the thin or thick filaments?

Answer 7

thick

Question 8

what’s in muscle fibers?

Answer 8

-a lot of myofibrils
-multinucleated
-many mitochondria
-transverse tubules
-specialized organelles

Question 9

what is a motor unit and what do?

Answer 9

s ingle motor neuron and all of the muscle fibers it innervates.

determine muscle contraction