Rio BIO 160 – Which of the following is a correctly describes

12 Jun Rio BIO 160 – Which of the following is a correctly describes

Question
1 of 25

Which of the following is a correctly describes muscle tissue?

a Skeletal muscle is multinucleated, striated, and involuntary.

b Smooth muscle is uninucleated, striated, and involuntary.

c Cardiac muscle is uninucleated, striated, and involuntary.

d Skeletal muscle is uninucleated, nonstriated, and voluntary.

e Smooth muscle is multinucleated, nonstriated, and voluntary.

2 of 25

What overlapping structures cause the “banding” appearance of skeletal muscle fibers?

a Myofibrils actin and myosin

b Myofilaments actin and myosin

c T tubules

d Sarcolemmas

e Acetylcholine

3 of 25

Which of the following describes actin containing filaments?

a They slide towards each other during contraction.

b They make up the large thick filament.

c They shorten during contraction.

d They contain projections called cross bridges.

e They are the only filament in the A band.

4 of 25

What does it mean when the sarcolemma is depolarized?

a A reverse of the electrical conditions of the membrane due to an influx of potassium

b A reverse of the electrical conditions of the membrane due to an influx of acetylcholine

c A reverse of the electrical conditions of the membrane due to an influx of sodium ions

d A stabilization of the electrical conditions of the membrane due to an influx of calcium ions

e A stabilization of the electrical conditions of the membrane due to a loss of sodium

5 of 25

What is the role of acetylcholine in muscle contraction?

a Acetylcholine attaches to the sarcolemma and makes the membrane more permeable.

b Acetylcholine attaches to the myosin and makes the myofilaments attach.

c Acetylcholine travels deep into the tubules and causes calcium to be released from the sarcoplasmic reticulum.

d Acetylcholine initiates the energy needed for the sliding filaments to move.

e Acetylcholine triggers the release of calcium into the synaptic gap.

6 of 25

What chemical triggers the sliding of the muscle filaments?

a Sodium

b ATP

c Potassium

d Acetylcholine

e Calcium

7 of 25

Which of the following describes complete tetanus of a muscle?

a A single stimulus is delivered, and the muscle contacts and relaxes.

b Stimuli are delivered frequently, and the contraction force increases with little relaxation.

c A smooth continuous contraction without any evidence of relaxation because stimulus is delivered rapidly and continually.

d A weak stimulus is delivered, and the muscle does not contract.

e A strong stimulus is delivered, but the muscle is fatigued and will not contract.

8 of 25

What is the slowest pathway for ATP regeneration?

a Direct phosphorylation

b Aerobic respiration

c Lactic acid production

d Glycolysis

e Anaerobic respiration

9 of 25

Which of the following describes isometric muscle exercise?

a Muscle size and strength will increase because the muscle fibers are making more myofilaments.

b Muscle endurance increases because the circulation to the muscles is enhanced.

c Muscle size increases because the muscle fibers produce more mitochondria.

d Muscle flexibility is increased because the muscle continually shortens.

e Muscles do not shorten during contraction so the muscles do not increase in size.

10 of 25

Which of the following correctly describes one of the five golden rules of skeletal muscle activity?

a The bulk of the muscle usually lies distal to the joint crossed.

b Most skeletal muscles cross at least one joint.

c Skeletal muscles can only push, not pull.

d During contraction, a skeletal muscle origin moves toward the insertion.

e Skeletal muscles have no more than one attachment point.

11

When a person shakes the head to indicate “no,” what type of movement is being demonstrated?

a Flexion

b Opposition

c Rotation

d Adduction

e Circumduction

12

What type of movement is indicated when a limb is moved toward the midline of the body?

a Flexion

b Opposition

c Abduction

d Adduction

e Circumduction

13

Which of the following describes muscle insertion?

a It is usually proximal to the origin.

b It does not move when the muscle contracts.

c It does not attach to a bone or skin.

d It moves away from the origin when a muscle contracts.

e It moves toward the origin when a muscle contracts.

14

When the knee is bent, the hamstring group of muscles contract. What is the insertion of this muscle group?

a Femur

b Ischium

c Tibia

d Tarsals

e Sacrum

15

What is the significant role of synergists and fixators?

a They are responsible for the primary movement desired.

b They are responsible for reversing the movement desired.

c They are antagonists of each other.

d They stabilize a bone and prevent excessive unwanted movement.

e They are responsible for the stretch of a primary mover.

16

What criterion is used in naming the deltoid muscle?

a Muscle shape

b Muscle location

c Action of the muscle

d Number of origins

e Direction of the muscle fibers

17

What is the fascicle arrangement of the orbicularis oris muscle?

a Pennate

b Parallel

c Fusiform

d Convergent

e Circular

18

What muscle compresses the cheek to hold food between the teeth during chewing?

a Masseter

b Temporalis

c Buccinator

d Platysma

e Zygomatic

19 of 25

What muscle is responsible for the flexion of the head?

a Platysma

b Sternocleidomastoid

c Masseter

d Temporalis

e Trapezius

20

What muscle is a prime mover of arm abduction and also a favored site for administering intramuscular injections?

a Triceps brachii

b Biceps brachii

c Deltoid

d Gluteus medius

e Gluteus maximus

21

What is the function of the latissimus dorsi muscle?

a Depression and adduction of the scapula

b Extension and adduction of the humerus

c Extension of the neck

d Extension of the back

e Lateral flexion of the spine

22

Which muscle is responsible for knee flexion?

a Gluteus medius

b Gluteus maximus

c Tibialis anterior

d Soleus

e Biceps femoris

23

What muscle is the prime mover for plantar flexion?

a Gastrocnemius

b Sartorius

c Rectus femoris

d Tibialis anterior

e Biceps femoris

24

Which of the following describes muscle fatigue?

a The muscle loses tone and becomes flaccid.

b The muscle is unable to contract due to oxygen deficiency.

c The muscle has atrophied as a result of not being used.

d The muscle is contracting but not shortening.

e The muscle has become paralyzed due to nerve damage.

25

Which of the following describes muscular dystrophy?

a Muscle weakness due to an autoimmune disease

b Muscle weakness due to disuse and lack of calcium blood levels

c Muscle weakness due to atrophy and increased fat and connective tissue deposits

d Uncontrolled muscle activity due to abnormal neural conduction

e Uncontrolled muscle activity due to increased calcium blood levels