Lecture Test 3 Muscle Physiology.

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Question #1

What happen to Ca2+ ions in the sarcoplasm, when they are no longer needed for muscle contraction?

A It remains attach to troponin until the next muscle contraction cycle

B It remains in the sarcoplasm until the next muscle contraction cycle

C It is actively transporting into in the T -tubule by the enzyme ATPase.

D It is actively transporting back into the sarcoplasmic reticulum by Ca2+ ATPase enzyme

Question #2

What causes the release (detachment) of actin from myosin to terminate muscle contraction?

A All of the possibleanswers are correct

B ATP molecule binding to the myosin head.

C ATP molecule binding to actin

D Ca2+ increase in the sarcomere

Question #3

What should be moved to allow attachment of actin and myosin during the cross bridge formation?

A Tropomyosin

B Troponin

C Calcium ions

D Sarcomere

Question #4

What two structures meet at the neuromuscular junction?

A Sarcolemma and T tubules

B A motor neuron and the sarcolemma of the skeletal muscle cell

C T tubule and sarcoplasmic reticulum

D A motor neuron and the sarcoplasmic reticulum

E A motor neuron and thick filaments of the skeletal muscle cell

Question #5

During skeletal muscle contraction, what gets released at the power stroke?

A an ATP molecule.

B Pi (inorganic phosphate)

C Ca2+ ions

D an ADP molecule.

Question #6

During muscle contraction, what do Ca2+ ions bind to?

A Myosin

B Actin

C Tropomyosin

D Troponin

Question #7

This type of muscle composes the largest share of muscle weight in the human body.

A smooth muscle

B skeletal muscle

C cardiac muscle

Question #8

The head of myosin is energized only during relaxation.

A True

B False

Question #9

Enzymes speed up the rate of chemical reactions.

A True

B False

Question #10

Skeletal muscle fibers are stimulated by motor neurons.

A False

B True

Question #11

Action potentials for the stimulation of muscle contraction are generated in ________________.

A Brain, Spinal cord and Peripheral nervous system

B Brain and Spinal cord

C Spinal cord

D Peripheral nervous system

E Brain

Question #12

Motor neurons conduct nerve impulses from the PNS to the CNS?

A True

B False

Question #13

Of the three classes of muscle cells (skeletal, cardiac and smooth muscle tissue), the only one in which the nuclei lie peripherally instead of centrally is _____________________________.

A skeletal.

B visceral.

C smooth.

D cardiac.

Question #14

This type of muscle contains intercalated discs.

A cardiac muscle

B skeletal muscle

C smooth muscle

D Skeletal and smooth muscles

Question #15

Muscles that assist the agonist muscle by reducing undesired action or unnecessary movement, such as the wrist extensor muscles.

A fixator

B Prime mover

C antagonist

D synergist

Question #16

Muscles that bears the major responsibility for a particular movement, an example is the biceps brachii muscle

A prime mover

B fixator

C synergist

D antagonist

Question #17

Muscles that reverses, or opposes, the action of another muscle, an example is the triceps brachii.

A antagonist

B synergist

C prime

D fixator

Question #18

The gluteus maximus and gluteus minimus muscles are named according to:

A Relative size

B Number of origins

C Shape

D Location of attachment

Question #19

The deltoid muscle is named according to:

A Relative size

B Location of attachment

C Shape

D Number of origins

Question #20

Which is not criterion for naming a muscle?

A color

B location

C shape

D action

Question #21

Fascicles inserted into the tendon from both sides, an example is the rectus femoris muscle.

A bipennate

B convergent

C fusiform

D multipennate

Question #22

Fascicles run parallel with an expanded central belly, like the biceps brachii muscle.

A convergent

B multipennate

C fusiform

D circular

Question #23

Fascicle arrangement in which the fascicles insert into one large tendon from all sides, an example is the deltoid muscle.

A multipennate

B convergent

C fusiform

D circular

Question #24

Fascicles are arranged in concentric rings, and example is the orbicularis oculi muscle.

A circular

B convergent

C multipennate

D fusiform

Question #25

Fascicle arrangement in which the origin of the muscle is broad, an example is the pectoralis major.

A convergent

B fusiform

C multipennate

D circular

Question #26

When you stand on your tiptoes, the lateral and medial bulges seen in your calf are the _____________________.

A hamstring

B soleus

C calcaneal tendon

D heads of gastrocnemius

Question #27

The arrangement of the elements is load- fulcrum – effort. Seesaws, scissors, and lifting your head of your chest are some examples.

A First – class lever

B Fourth – class lever

C Second – class lever

D Third – class lever

Question #28

The arrangement of the elements is load- effort- fulcrum. Lifting or holding something with tweezers or flexing the forearm by the biceps brachii muscle.

A Second – class lever

B Third – class lever

C Fourth – class lever

D First – class lever

Question #29

The arrangement of the elements is fulcrum- load- effort, as exemplified by a wheelbarrow or standing on tiptoe.

A First – class lever

B Second – class lever

C Fourth – class lever

D Third – class lever

Question #30

A lever operates as a ____________ when a smaller effort can move a heavy load.

A Positive mechanical effort

B Mechanical advantage

C Mechanical disadvantage

D Negative mechanical effort

Question #31

A lever operates as a _____________when a larger effort moves a lighter load.

A positive mechanical effort

B negative mechanical effort

C mechanical disadvantage

D mechanical advantage

Question #32

In the lever systems _______________ provides effort.

A bones

B joints

C muscle contraction

D load

Question #33

In the lever system _______________ act as levers.

A joints

B bones

C muscle contraction

D load

Question #34

In the lever systems _________________ consist of overlying tissue, bone, and anything lifted.

A joints

B bones

C muscle contraction

D load

Question #35

In the lever systems __________________ act as fulcrum.

A muscle contraction

B bones

C load

D joints

Question #36

Abnormal contraction characterized by involuntary twitching of muscle normally under voluntary control – eyelid or fascial muscles.

A Fasciculation

B Spasm

C Tremor

D Tic

Question #37

Abnormal contraction characterized by rhythmic, involuntary contraction of opposing muscle groups.

A Tremor

B Spasm

C Fasciculation

D Tic

Question #38

Abnormal contraction characterized by involuntary contraction of a single muscle.

A Tic

B Spasm

C Tremor

D Fasciculation

Question #39

Skeletal muscle disorder in which pain is caused by tightened bands of muscle fibers. It refers to pain and inflammation in the body’s soft tissues.

A Duchenne muscular dystrophy

B Myofascial pain syndrome

C Fibromyalgia

D Myotonic dystrophy

Question #40

Progressive skeletal muscle disorder in which the muscles are weak and slow to relax after contraction.

A Fibromyalgia

B Myotonic dystrophy

C Duchenne muscular dystrophy

D Myofascial pain syndrome

Question #41

Fibers abundant in the muscle of the lower limbs, which must move the body for long periods during locomotion, fibers with an intermediate diameter, they have high myoglobin content and rich supply of capillaries. Fibers with aerobic and anaerobic metabolic pathways.

A fast oxidative fibers (type IIa)

B fast glycolytic fibers (type IIx)

C slow glycolytic fibers

D slow oxidative fibers

Question #42

Of the various types of skeletal muscle fibers, the type that produces the most power, depend on anaerobic pathways, contract rapidly and tire quickly, fibers used in heavy weight training. Contain little myoglobin and few mitochondria.

A fast glycolytic fibers (type IIx)

B slow glycolytic fibers

C slow oxidative fibers

D fast oxidative fibers (type IIa)

Question #43

Of the various types of skeletal muscle fibers, the type with the most mitochondria, red in color due to abundant myoglobin, obtain energy from aerobic metabolic pathways, fibers are small in diameter and found in postural muscles.

A slow glycolytic fibers

B slow oxidative fibers

C fast oxidative fibers (type IIa)

D fast glycolytic fibers (type IIx)

Question #44

The sarcoplasmic reticulum stores ________________.

A ATPase

B sodium

C myosin

D calcium

Question #45

What is the function of the protein Titin?

A prevents a muscle from being overstretched.

B forms the Z disk to which actin attaches

C Connects myosin to actin

D limits the degree to which a muscle may contract.

Question #46

Located in walls of hollow organs such as blood vessels, esophagus, and intestines.

A smooth

B cardiac

C skeletal

D red

Question #47

Autorhythmic because of built of pacemakers.

A cardiac

B red

C skeletal

D smooth

Question #48

Involuntary and non-striated in appearance muscle .

A red

B cardiac

C smooth

D skeletal

Question #49

Involuntary striated muscle.

A smooth

B red

C cardiac

D skeletal

Question #50

Type of muscle in which several nuclei are peripherally arranged.

A cardiac

B smooth

C red

D skeletal

Question #51

The only muscle cells that branch are ____________ muscle cells.

A smooth

B skeletal

C cardiac

D red

Question #52

A stem cell that is found in skeletal muscle fibers and promotes their growth, repair, and regeneration.

A myoblast

B mesoblast

C satellite cells

D endoblast

Question #53

During the embryonic development, each skeletal muscle arises from the fusion of a hundred or more mesodermal cells called:

A myoblast

B mesoblast

C satellite cells

D endoblast

Question #54

The embryonic origin of muscle tissue is from

A ectoderm

B epidermis

C endoderm

D mesoderm

Question #55

Each skeletal muscle is supplied by:

A peripheral neuron, muscle cell, and sarcoplasm

B A nerve, artery, and two or more veins

C Veins, Schwann cells, axons, and synaptic end bulbs

D An afferent neuron

Question #56

Connective tissue that surrounds each fascicle (group of muscle fibers).

A endomysium

B epimysium

C deep fascia

D perimysium

Question #57

A fine sheath of connective tissue wrapping each muscle cell.

A perimysium

B epimysium

C endomysium

D deep fascia

Question #58

Ability to return to original shape (recoil) after being stretched.

A excitability

B contractibility

C elasticity

D extensibility

Question #59

Ability to stretched back to its original length without damaging tissue.

A contractibility

B excitability

C extensibility

D elasticity

Question #60

Ability to shorten and generate pulling forces.

A extensibility

B excitability

C elasticity

D contractibility

Question #61

Ability to propagate impulses (signals) over membrane and stimulates the muscle cells to contract.

A extensibility

B excitability

C elasticity

D contractibility

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Lecture Test 3 Muscle Physiology.

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