9A .2

Question 1

What are the Connective tissue coverings?

Answer 1

-Fascia
-Tendon
-Aponeurosis

Question 2

Fascia

Answer 2

Layers of dense connective tissue separating muscles and stabilize their position
*subcutaneous-immediately under the skin
*Deep-lines the body walls and limbs (usually tough)

Question 3

Tendon

Answer 3

projections of fascia at the ends of a muscle that attach to bone

Question 4

Aponeurosis

Answer 4

flat, fibrous sheets attaching to other muscles or bone

Question 5

Epimysium

Answer 5

Sheath covering the whole muscle

Question 6

Perimysium

Answer 6

-Extends inward from the epimysium and separates muscle tissue into small bundles

Question 7

Muscle bundles are known as…

Answer 7

Fascicles

Question 8

Fascicles contain…

Answer 8

10-100+ muscle fibers (muscle cell)

Question 9

Endomysium

Answer 9

-weaves in between each bundle separating individual muscle fibers

Question 10

Muscle Fibers

Answer 10

-form from undifferentiated cells that fuse together
-Creates a thin, elongated multinucleated cylinder
-Has a cell membrane and cytoplasm
-lie parallel to each other
-each fiber is stuffed with small parallel fibers called

Question 11

Order of muscle

Question 12

Whats Sarcolemma

Answer 12

Cell membrane

Question 13

Whats Sarcoplasm

Answer 13

cytoplasm

Question 14

Myofibrils

Answer 14

-Produces the alternating light and dark bands with parts called myofilaments
-Play a fundamental role in contraction mechanisms
-filaments do not extend through the whole fiber
-The striations form a repeating pattern of units called sarcomeres

Question 15

Actin

Answer 15

thin filaments

Question 16

Myosin

Answer 16

thick filaments

Question 17

Sarcomeres

Answer 17

Functional units of contraction

Question 18

I-Band

Answer 18

-light band due to containing thin filaments(actin) only
-attached together by z-line

Question 19

z-line

Answer 19

-seperate one sarcomere from the next

Question 20

A-Band

Answer 20

-dark bands due to presence of many thick filaments (myosin), overlapping thin filaments

Question 21

H-zone

Answer 21

-slightly lighter region within the A- band
-contains thick filaments only

Question 22

M-line

Answer 22

-thickening of the A-band
-help hold thick filaments in place

Question 23

Titin

Answer 23

-protein that attaches the myosin filaments to the z-line

Question 24

Cross Bridges

Answer 24

-Two twisted protein strands with globular heads on each myosin molecule
-Attach to binding sites on actin filaments
*Contain 2 proteins: troponin and tropomyosin

Question 25

What are the two proteins of actin?

Answer 25

Troponin and tropomyosin

Question 26

Sarcoplasmic Reticulum

Answer 26

-Network of channels running parallel and surrounding each myofibril
-Specialized ER
-Transverse Tubules
-T-tubes lie between two enlarged cisternae

Question 27

Transverse Tubules

Answer 27

Extends thru the sarcoplasm containing ECF