Muscle Tissue

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1

Muscle tissue consists of cells that are highly specialized for ________________.

contraction

2

Functions of Skeletal Muscle

- produce movement
-maintain posture
-maintain body temperature
-guard body entrances and exits
-support soft tissue
-store nutrients

3

At the end of the muscle, the collagen fibers of the epimysium, and each perimysium and endomysium, come together to form a _____________.

card image

tendon

4

Epimysium

card image

-dense layer of connective tissue that surrounds an entire skeletal muscle

5

Nerves and blood vessels that service a muscle fiber are located in the connective tissue of its _____________.

endomysium

6

Fascicle

card image

-a group of muscle fibers that are encased in the perimysium

7

Endomysium

-delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together

8

Tendon

-bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone.
*ATTACHES MUSCLE TO BONE

9

Put the following structures in order from superficial to deep:
1. muscle fiber
2. perimysium
3. myofibril
4. fascicle
5. endomysium
6. epimysium

624513

10

Interactions between actin and myosin filaments of the sarcomere are responsible for __________________.

muscle contraction

11

In a sarcomere, thick filaments are linked laterally by proteins of the ___________.

M line

12

The advantage of having many nuclei in a skeletal muscle fiber is_________________.

the ability to produce nutrients for muscle contraction

13

Skeletal muscle fibers are formed from embryonic cells called _________________.

Myoblasts

14

Sarcomere

-the repeating unit of a skeletal muscle fiber
-repeating unit of striated myofibrils

15

Sarcolemma

-the plasma membrane of a skeletal muscle fiber

16

Muscle Fibers

-have many nuclei

17

Sarcoplasmic Reticulum

-storage and release site for calcium ions

18

Z Line

-thin filaments are anchored here

19

A Band

-region of the sarcomere containing thick filaments

20

Triad

-the skeletal muscle complex consists of a transverse tubule and two terminal cisternae

21

Cross-bridges are portions of_______________.

myosin molecules

22

H Band

-the area in the center of the A band that contains no thin filaments