Histology of Muscles

Question 1

Represents thick filaments held in register at the center of the sarcomere

Answer 1

M-line

Question 2

Type of muscle fiber is found in muscles involved in sustaining posture or upright position?

Answer 2

Type I

Question 3

Connective tissue surrounding each muscle bundle

Answer 3

Epimesium

Question 4

Connective tissue surrounding each muscle fascicle

Answer 4

Perimesium

Question 5

Connective tissue surrounding each muscle fiber

Answer 5

Endomesium

Question 6

A bundle of muscle fibers

Answer 6

Muscle fascicle

Question 7

A bundle of myofibrils

Answer 7

Muscle fiber

Question 8

A bundle of myofilaments

Answer 8

Myofibril

Question 9

Basic contractile unit found between two adjacent Z-lines

Answer 9

Sarcomere

Question 10

Types of myofilaments

Answer 10

Thick (myosin) and thin (actin) filaments

Question 11

Visceral striated muscles are morphologically similar to skeletal muscles. T/F

Answer 11

T

Question 12

Types of muscle according to appearance of contractile cells

Answer 12

Striated muscle and smooth muscle

Question 13

Types of skeletal muscle fibers

Answer 13

Type I / slow oxidative/ red, Type IIa/ fast oxidative glycolytic/ intermediate, Type IIb/ fast glycolytic/ white

Question 14

Type I and Type IIb fibers have high numbers of mitochondria. T/F

Answer 14

F

Type I and Type IIa have. Type IIb has less.

Question 15

Type IIa and Type IIb fibers have high amounts of myoglobin. T/F

Answer 15

F

Type I and Type IIa have. Type IIb has less.

Question 16

Type IIa fibers are fatigue-prone. T/F

Answer 16

F

Type IIb is. Type IIa and type I are fatigue-resistant.

Question 17

High percentage of muscle type in marathon runners

Answer 17

Type I/ slow oxidative

Question 18

High percentage of muscle type in middle distance swimmers and hockey players

Answer 18

Type IIa/ fast oxidative glycolytic

Question 19

High percentage muscle type in short distance sprinters and weight lifters

Answer 19

Type IIIa/ fast glycolytic

Question 20

Muscle fibers that produce lactic acid

Answer 20

Type IIa, Type IIb

Question 21

Muscle fibers that store glycogen

Answer 21

Type IIa, Type IIb

Question 22

Which type of muscles are the long muscles of the back?

Answer 22

Type I

Question 23

Which type of muscles are the muscles of the digits?

Answer 23

Type IIb

Question 24

Term for the smooth ER of muscle cells

Answer 24

Sarcoplasmic reticulum

Question 25

Muscle fibers are connective tissue. T/F

Answer 25

F

They are muscle cells.

Question 26

The contractile elements of striated muscles

Answer 26

Myofilaments

Question 27

Birefringent dark bands of muscle fibers

Answer 27

A bands (anisotropic)

Question 28

Monorefrigent light bands of muscle fibers

Answer 28

I bands (isotropic)

Question 29

The dense line that bisects the I band

Answer 29

Z line/ Z disc

Question 30

The light region that bisects the A band

Answer 30

H band

Question 31

The narrow dense line that bisects the H band

Answer 31

M line