Muscle Tissues

muscle tissue

A group of muscle cells or fibers composed of organelles and inclusions like any other cells

Sarcolemma, sarcoplasm, flesh

In muscles tissue, _____ is the name of the cell membrane and the cytoplasm is called ______. The prefix “sarco” means _____

actin and myosin

In the muscle tissue, the ____ and ____ that comprise the myofilaments enable the muscle to perform the property of its sarcoplasm i.e. contractility responsible for locomotion/movement of the body.

1. muscle

2. muscle fiber bundles

3. Muscle fiber

4. myofibril

5. myofilaments

Identify the structures

left to right

• Triad

• sarcoplasmic reticulum

• T tubules

• myofibrils

• sarcoplasm

• sarcolemma

• terminal cisterna

identify the pointed structures

1. smooth/ non-striated /involuntary muscle

2. skeletal/ striated / voluntary muscle

3. cardiac/ striated/ involuntary muscle

What are the types of muscle tissue?

• cells are elongated and spindle-shaped cells with tapered ends

• nucleus is also elongated, centrally located

Describe the cell shape and nucleus of the smooth muscles

tightly packed

The muscle fibers of smooth muscle are _____ to form sheet.

longitudinal section

In ______, fibers of smooth muscle forms sheet that ae arranged in staggered fashion.

staggered

In smooth muscle, the middle portion of the fiber is adjacent to the tapered end of other fiber making the nuclei appear _____.

long, cylindrical, blunt, peripherally

In skeletal muscle, the fiber is ____ and _____ with ____ ends. Many of its nuclei are located _____.

cross-striations, sarcoplasm

Skeletal muscle’s special feature is __________ of the ______ oriented perpendicular to the long axis of the fiber

dark or A band, light or I band

The striations in skeletal muscles are the alternating ______ and ______

• I band contains the fine/thin actin filaments

• A band contains the thick myosin filament and overlapping ends of actin, that makes A band dark

Describe the I and A band

sliding of actin into the interstices of the myosin, Z lines, middle of the sarcomere

In skeletal muscle, the contraction of the sarcomere is the result of _________, where they are interdigitated, pulling the _____ until at full contraction. The free ends of actin meet in the ________.

H band

A contracted sarcomere has no _____.

1. Relaxed muscle

2. Partially contracted muscle

3. maximally contracted muscle

identify

overextend, slide away, H band, A band

In a stretched sarcomere, the actin filaments ______ and _______ from the myosin, resulting to a wide ________ almost obliterating the _______

middle, ends

In relaxed or contracted sarcomere, myofilaments are longitudinal arrangement in the ______, extending to but not reaching the ____ of sarcomere.

Z line, middle of each adjacent sarcomere, H band

Actin filaments extend from the ______ toward the _______ in between the myosin filaments where they terminate in free ends before reaching the _______

fields of cohnheim

Skeletal muscle under the light microscope, group of myofilaments appear clumps of acidophilic dots called _______

refer to this pic for the answers

identify the pointed structures

1. low

2. high

3. many

4. white

5. yes

6. fast

7. prolonged

8. high

9. low

10. few

11. red

12. no

13. slow

14. short

	Type I Slow Twitch	Type II Fast Twitch
Myosin ATPase	1	8
Energy Utilization	9	2
Mitochondria	3	10
Color	11	4
Myoglobin	5	12
Contraction rate	13	6
Duration	7	14

fill up the table

1. ordinary cardiac muscle

2. special cardiac muscle fiber or Purkinje fiber

2 types of cardiac muscles

cross-striations, smooth muscle, center

Ordinary cardiac muscle has _______ but functions like ______. Many of their nuclei are located at the ______ of elongated branched fiber.

vascular, intercalated disc

Ordinary cardiac muscles are highly _________ and have ______, running transversely on the longitudinal axis of the fibers.

the point of end to end contact of the muscle fibers

what does the intercalated disc indicates?

fiber-impulse conducting cells, A-V node to IV septum

Special cardiac are _______ located from _____ to ______

1. Smooth muscle - regeneration is limited, healing is through connective tissue formation

2. Skeletal muscle - regeneration is limited, healing is through scar tissue formation

3. Cardiac muscle - do not regenerate, healing is through scar formation

Provide the Regeneration and Repair characteristics of the 3 types of muscles