Histology Muscle Tissue Chapter 10

Front 1

In which tissue are intercalated disks found?

Back 1

cardiac tissue

Front 2

Epimysium

Back 2

In skeletal muscle, an external sheath of dense connective tissue surrounding the entire muscle

Front 3

Perimysium

Back 3

In skeletal muscle, connective tissue around each BUNDLE of muscle fiber

Front 4

Endomysium

Back 4

In skeletal muscle, delicate layer of connective tissue surrounding each muscle FIBER

Front 5

What protein is present in endomysium? Where else is it present?

Back 5

laminin; nerve fibers

Front 6

How long are thick filaments? Which band do they occupy?

Back 6

1.6 um; A band

Front 7

What is responsible for tying adjacent sarcomeres together? Where are they located?

Back 7

alpha-actinin and desmin; along Z-line

Front 8

What is the major protein of the M-line

Back 8

creatine kinase
-catalyzes the transfer of a PO4- group from phosphocreatine to ADP, thus making ATP for muscle contraction

Front 9

Tropomyosin

Back 9

long, thin m/c about 40nm in length
made of 2 polypeptide chains bound head to tail, running over actin subunits

Front 10

TnT

Back 10

Troponin component that strongly attaches to tropomyosin

Front 11

TnC

Back 11

Troponin component that binds Ca ions

Front 12

TnI

Back 12

Troponin component that inhibits actin-myosin interactions

Front 13

How and why are cross-bridges formed?

Back 13

By head of myosin molecule plus short part of its rodlike portion; converts chemical energy to mechanical energy

Front 14

Where are triads located in mammalian skeletal muscle?

Back 14

There are two for each sarcomere in this muscle - located at the A-I band junction