Muscle questions

Question 1

What is the meaning of the term fiber as it is used in regard to muscle?

Answer 1

Muscle cell

Question 2

Which component of the nervous system innervates smooth muscle?

Answer 2

Autonomic

Question 3

What type of muscle has the slowest rate of contraction?

Answer 3

Type I red fibers

-slow twitch

Question 4

What other tissues are usually found in association with muscle?

Answer 4

Connective tissue

Question 5

In cross section, only some smooth muscle cells will appear to have nuclei. Why is this the case?

Answer 5

Smooth muscle cells are uninucleated

-due to the elongation of the muscle fiber the cross section my not cut through nucleus

Question 6

What component of the H&E dye combination stains the sarcoplasm of muscle cells

Answer 6

Eosin

Question 7

Why is skeletal muscle referred to as voluntary muscle?

Answer 7

Innervated by cerebrospinal nerves and is under control of the individual

Question 8

After injury what cell is primarily responsible for repair of skeletal muscle

Answer 8

Satellite cells

Question 9

The connective tissue that establishes bundles of skeletal muscle fibers is known as the

Answer 9

Perimysium

Question 10

In which type of muscle are the nuclei located at the periphery of the fibers?

Answer 10

Skeletal muscle

Question 11

The cross banded appearance of both skeletal and cardiac muscle is due to the presence of

Answer 11

myofibrils

Question 12

In skeletal muscle, the portion of one myofibril btwn 2 adjacent Z lines is called the

Answer 12

sarcomere

Question 13

In skeletal muscle, the thin dark line within the H bad is the

Answer 13

Thick filament Myosin

Question 14

The regularity of sarcomere structure is maintained by a large protein called

Answer 14

titin

Question 15

what happens to the number of satellite cells per muscle fiber as we grow older?

Answer 15

Decrease

Question 16

Which skeletal muscle type is most resistant to fatigue?

Answer 16

Red fibers Type I

Question 17

In which type of muscle do the fibers branch and anastomose?

Answer 17

Cardiac muscle

Question 18

In which 2 types of muscle are the nuclei centrally placed within the cells?

Answer 18

Smooth and cardiac muscle

Question 19

Why is the banding pet tern of cardiac muscle not a distinct as that of skeletal muscle?

Answer 19

Due to the cross striations

Question 20

What component of a cardiac muscle fiber is responsible for mechanical stability, transmission of electrical and chemical stimuli and contractile force?

Answer 20

intercalated discs

Question 21

Atrial natriuretic factor (ANF) is produced in the

Answer 21

Atria

Question 22

In the H&E stained preparation, the central region of purkinje cells appears the be empty. why is this?

Answer 22

Glycogen rich area– doesn’t stain

Question 23

In atherosclerosis, which type of muscle tends to accumulate in the tunica intima of blood vessels?

Answer 23

smooth muscle

Question 24

What is the most common heart arrhythmia?

Answer 24

A-fib