Final 3

Question 1

only muscle cells are always multinucleated

Answer 1

skeletal

Question 2

the end of the muscle that typically moves when a muscle contracts is called the

Answer 2

insertion

Question 3

only muscle cells commonly branch

Answer 3

cardiac

Question 4

a smooth sustained contraction from rapid stimulation is called

Answer 4

fused tetanus

Question 5

is a powerful forearm entensor

Answer 5

triceps brachii

Question 6

what structure in skeletal muscle functions in calcium strorage

Answer 6

myofibrillar network

Question 7

what produces striations of a skeletal muscle cell

Answer 7

the arrangement of myofilaments

Question 8

during muscle contraction, myosin cross bridges attach to which active sites

Answer 8

actin filaments

Question 9

which of the following surrounds individual muscle cell

Answer 9

endomysium

Question 10

rigor mortis occurs because

Answer 10

no ATP is available to release attached actin and myosin molecules

Question 11

the contractile units of skeletal muscles are

Answer 11

myofibrils

Question 12

what is the functional unit of a skeletal muscle called

Answer 12

a sacromere

Question 13

what is the role of calcium ions in muscle contraction

Answer 13

bind to regulatory sites on troponin to remove contraction inhibition

Question 14

which of the following is not a connective tissue sheath that wraps individual muscle fibers

Answer 14

aponeurosis

Question 15

the muscle cell membrane is called the

Answer 15

sarcolemma

Question 16

muscle tissue has all of the following properties except

Answer 16

secretion

Question 17

which type of lever is demonstrated by using scissors

Answer 17

a first-class lever

Question 18

when the term biceps, triceps, or quadriceps forms part of a muscle’s name, what does it tell you about the muscle

Answer 18

the muscle has two, three, or four origin respectively

Question 19

which of the following inserts by the calcaneal tendon

Answer 19

the gastrocnemius

Question 20

which of the following is not a member of the hamstrings

Answer 20

gracilis

Question 21

which of the following muscles is not a member of the hamstrings group

Answer 21

vastus intermedius

Question 22

which of the following muscles is involved in producing horizontal wrinkles in the forehead

Answer 22

the frontal belly of the epicranius

Question 23

what is the role of tropomyosin in skeletal muscle

Answer 23

tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules

Question 24

excitation-contraction coupling requires which of the following substances

Answer 24

Ca2+ and ATP

Question 25

myoglobin

Answer 25

stores oxygen in muscles

Question 26

during vigorous exercise, there may be insufficient oxygen available to completely break down pyruvic acid for energy. As a result, the pyruvic acid is converted to

Answer 26

lactic acid

Question 27

which of the following statements is true

Answer 27

striated muscles cells are long and cylindrical with many nuclei

Question 28

muscle tone is

Answer 28

a state of sustained partial contraction

Question 29

the sliding filament model of contraction involves

Answer 29

actin and myosin sliding past each other and partially overlapping

Question 30

After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction

Answer 30

acetylcholinesterase destroying the ACh

Question 31

which of the following muscles is involved in inversion at the ankle joint

Answer 31

tibialis anterior

Question 32

which of the following muscles is not a rotator cuff muslce

Answer 32

levator scapulae

Question 33

hypothetically, if a muscle were stretched to the point where thick and thin filaments no longer overlapped

Answer 33

no muscle tension could be generated