Exam 3- Muscle Fiber anatomy Flashcards Preview

Anatomy And Physiology I > Exam 3- Muscle Fiber anatomy > Flashcards

Flashcards in Exam 3- Muscle Fiber anatomy Deck (8):
1

Sarcolemma

specialized plasma membrane

2

Sarcoplasm

specialized cytoplasm

3

Sarcoplasmic Reticulum (SR)

Specialized ER
pumps and stores Ca++

4

T Tubules

inward extensions of the sarcolemma
allows electrical impulses traveling along the sarcolemma to move deep into the cell

5

Triad

triplet of T Tubules: a tubule between two sacs of SR

6

Myofibrils

Bundles of proteins.
Divided into sections called sarcomeres; marked by z-disks. Composed of smaller fibrils (thick and thin)

7

Thick myofilaments

Composed of bundles of myosin
long filament type proteinwith a cross bridge extending from the end
Cross bridges occur at regular intervals
Thick myofilaments do not attach to z-disks

8

Thin myofilaments

Composed of three proteins: tropomysosin: filament, structural
Actin: globular, has active site
Troponin: shape shifter