Muscle Anatomy and Physiology

Question 1

tendon

Answer 1

a flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone

Question 2

fascia

Answer 2

a sheet of tissue that covers or connects parts inside the body (such as muscles)

Question 3

epimysium

Answer 3

the outermost fibrous sheath that covers a muscle

Question 4

Muscular relaxation is caused by

Answer 4

calcium pumps in the lateral sacs of t-tubule pump calcium back into the lumen of SR

Question 5

myofibrils

Answer 5

series of structures (sarcomeres)

Question 6

plasma membrane

Answer 6

true cell boundary that maintains acid base balance

Question 7

why do skeletal muscle fibers have a striated appearance?

Answer 7

due to the banding of thick and thin myofilaments

Question 8

Sarcomeres

Answer 8

basic functional contractile unit of a muscle

Question 9

what are the 2 basic parts of a sarcomere

Answer 9

thick and thin filaments

Question 10

dark bands in striated muscle are due to

Answer 10

the overlap of thick (myosin) and thin (actin) myofilaments.

Question 11

Light bands are due to

Answer 11

a lesser density and greater penetration of light

Question 12

myosin heavy chain

Answer 12

molecular weight 200 kilodaltons

Question 13

myosin light chain

Answer 13

16-28 kilodaltons

Question 14

thin filament

Answer 14

actin

Question 15

thick filament

Answer 15

myosin

Question 16

Muscle work

Answer 16

the sliding of thin filaments over the thick filaments. (isometric, concentric, or eccentric)

Question 17

isometric

Answer 17

the filaments refuse to move (same length)

Question 18

concentric

Answer 18

the thin filaments slide towards each other (shortening)

Question 19

eccentric

Answer 19

the thick filaments try to prevent the thin filaments from sliding apart. (negative)(lengthening)

Question 20

H-Zone and Z-Line disappear in

Answer 20

contraction

Question 21

Unique cells

Answer 21

shape
length
nuclei
satellite cells
basement membrane
polarized sarcolemma

Question 22

cell dimensions

Answer 22

volume
number
length
radius
number of capillaries