Muscles 2

Question 1

Wasting away of muscle tissue due to disuse is called

Answer 1

atrophy.

Question 2

In which of the following would the ratio of motor neurons to muscle fibers be the greatest?
The calf muscles
Large muscle of the upper arms 
Postural muscles of the back 
Muscles that control the eye 
Leg muscles

Answer 2

Muscles that control the eye

Question 3

The amount of oxygen debt developed after strenuous exercise is directly related to the concentration of

Answer 3

lactic acid.

Question 4

ATP molecules in muscle cells are synthesized by

Answer 4

cellular respiration.

Question 5

How many ATP molecules are hydrolyzed into ADP during one crossbridge formation cycle?

Answer 5

One

Question 6

Select the statement that is NOT correct.

The union of an axon tip and a muscle fiber forms a neuromuscular junction.

Removal of acetylcholine causes the muscle fiber to contract.

Acetylcholine is removed from the synaptic clefts by cholinesterase.

An activated neuron axon tip releases acetylcholine into the synaptic clefts.

Answer 6

Removal of acetylcholine causes the muscle fiber to contract.

Question 7

Wave summation is the result of:
Ca2+ remaining in the sarcoplasm.
Ca2+ remaining in the sarcoplasmic reticulum. 
a single action potential.
larger motor units.
open Na+ channels.

Answer 7

Ca2+ remaining in the sarcoplasm.

Question 8

The non-movable attachment of a muscle is the

Answer 8

origin.

Question 9

The two major pairs of chewing muscles are the:
zygomaticus major and temporalis.
orbicularis oris and zygymaticus major.
temporalis and masseter.

Answer 9

temporalis and masseter.

Question 10

The cell membrane of skeletal muscle is called the

Answer 10

sarcolemma.

Question 11

The type of muscle fiber that is least resistant to fatigue is the \_\_\_\_fiber.
intermediate
aerobic 
high-density 
slow
fast

Answer 11

fast

Question 12

A small amount of oxygen is stored in muscle cells in combination with

Answer 12

myoglobin.

Question 13

What is the insertion (bone) of the supraspinatus muscle?

Answer 13

humerus

Question 14

What is the origin (bone) for the supraspinatus muscle?

Answer 14

scapula

Question 15

What is the origin (bone) for the teres minor muscle?

Answer 15

scapula

Question 16

The muscle that abducts and extends the humerus is the

Answer 16

deltoid.

Question 17

The muscle that dorsiflexes and inverts the foot is the

Answer 17

tibialis anterior.

Question 18

A motor unit is:
all of the neurons that stimulate a particular skeletal muscle.

a motor neuron plus all the skeletal muscle fibers it stimulates.

the sarcomeres in an individual myofibril.

all the muscles that act as prime movers for a particular action.

Answer 18

a motor neuron plus all the skeletal muscle fibers it stimulates.

Question 19

Production of sufficient ATP is dependent upon the

Answer 19

availability of oxygen

Question 20

The muscle that extends the leg is the

Answer 20

rectus femoris.

Question 21

What is the insertion (bone) of the latissimus dorsi?

Answer 21

humerus

Question 22

The constant partial contraction of skeletal muscles produces:
muscle tone.
chronic fatigue.
tetanic contractions.

Answer 22

muscle tone

Question 23

Fatigue seems to result from a/an:
accumulation of lactic acid and lack of oxygen.
lack of glucose.
lack of stimulation. 
accumulation of glycogen.

Answer 23

accumulation of lactic acid and lack of oxygen.

Question 24

The movable attachment of a muscle is the

Answer 24

insertion.

Question 25

What is the origin (bone) for the zygomaticus major?

Answer 25

zygomatic bone

Question 26

What is the origin (bone) for the infraspinatus muscle?

Answer 26

scapula