Chpt. 10 & 11 Multiple Choice II Created By Day

40 Questions | By Parentof2 | Updated: Mar 21, 2022 | Attempts: 139

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1.

Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?
- A.
  
  Skeletal muscle
- B.
  
  Smooth muscle
- C.
  
  Cardiac muscle
- D.
  
  Skeletal and smooth muscle
- E.
  
  Smooth and cardiac muscle
2.

Which muscle(s) can contract without the need for nervous stimulation?
- A.
  
  Skeletal muscle
- B.
  
  Smooth muscle
- C.
  
  Cardiac muscle
- D.
  
  Smooth and cardiac muscle
- E.
  
  Skeletal, smooth and cardiac muscle
3.

80% of the lactic acid produced by skeletal muscle is converted to pyruvic acid
- A.
  
  By the kidneys
- B.
  
  In the liver
- C.
  
  In the muscle tissue
- D.
  
  In the sarcoplasmic reticulum
- E.
  
  In the neuromuscular junction
4.

During muscle contraction, a single myosin head consumes ATP at a rate of about
- A.
  
  1 ATP per second.
- B.
  
  3 ATP per second.
- C.
  
  5 ATP per second.
- D.
  
  7 ATP per second.
- E.
  
  9 ATP per second.
5.

The term for shortening of a muscle while maintaining constant tension is
- A.
  
  Treppe.
- B.
  
  Tetanus.
- C.
  
  Isokinetic contraction.
- D.
  
  Isometric contraction.
- E.
  
  Isotonic contraction.
6.

Which fibers are primarily responsible for producing lactic acid?
- A.
  
  Type I slow oxidative fibers
- B.
  
  Type IIA intermediate glycolytic fibers
- C.
  
  Type IIB fast glycolytic fibers
- D.
  
  Type I slow-twitch fibers
- E.
  
  Red fibers
7.

In comparison to skeletal muscle, smooth muscle
- A.
  
  Contracts more slowly but relaxes more rapidly.
- B.
  
  Contracts more rapidly but relaxes more slowly.
- C.
  
  Contracts and relaxes more slowly.
- D.
  
  Consumes more ATP to maintain a given level of muscle tension.
- E.
  
  Depends on a nerve fiber to supply the calcium needed for contraction.
8.

Which of the following is very important for muscle to continue contraction during anaerobic respiration?
- A.
  
  Cholinesterase inhibitors
- B.
  
  Protease
- C.
  
  Myokinase
- D.
  
  Acetylcholinesterase
- E.
  
  Acid phosphatase
9.

The minimum stimulus needed to cause muscle contraction is called
- A.
  
  The threshold.
- B.
  
  The latent period.
- C.
  
  Twitch.
- D.
  
  Recruitment.
- E.
  
  Innervation.
10.

If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be
- A.
  
  Fatigue.
- B.
  
  Treppe.
- C.
  
  Incomplete tetanus.
- D.
  
  Complete tetanus.
- E.
  
  Flaccid paralysis.
11.

Which of the following is true concerning isotonic eccentric contraction?
- A.
  
  The muscle shortens but tension remains constant.
- B.
  
  The muscle lengthens but tension remains constant.
- C.
  
  The muscle tenses and shortens.
- D.
  
  The muscle tenses but length remains unchanged.
- E.
  
  The muscle lengthens and tension declines.
12.

Which of the following has the largest mitochondria?
- A.
  
  Slow oxidative fibers
- B.
  
  Fast glycolytic fibers
- C.
  
  Cardiac muscle
- D.
  
  Smooth muscle
- E.
  
  Intermediate fibers
13.

Which statement best describes the goal of medications used to treat myasthenia gravis?
- A.
  
  To increase the number of acetylcholine receptors
- B.
  
  To decrease the number of synaptic vesicles
- C.
  
  To promote multiple motor unit summation
- D.
  
  To inhibit Ca2+ release from the sarcoplasmic reticulum
- E.
  
  To inhibit the function of cholinesterase
14.

The process of bringing more motor units into use during a muscle contraction is called
- A.
  
  Wave summation.
- B.
  
  Recruitment.
- C.
  
  Treppe.
- D.
  
  Incomplete tetanus.
- E.
  
  Complete tetanus.
15.

Aerobic respiration produces approximately _____ more ATPs per glucose molecule than glycolysis does.
- A.
  
  12
- B.
  
  24
- C.
  
  36
- D.
  
  48
- E.
  
  100
16.

Athletes who train at high altitudes increase their red blood cell count and thus increase their oxygen supply during exercise. Increased oxygen supply results in
- A.
  
  Increased glycolysis.
- B.
  
  Increased use of myokinase.
- C.
  
  Longer aerobic respiration.
- D.
  
  Longer anaerobic fermentation.
- E.
  
  Reduced ATP consumption.
17.

Cardiac muscle has very little capacity for regeneration because it lacks
- A.
  
  Satellite cells.
- B.
  
  Endomysium.
- C.
  
  Sarcomeres.
- D.
  
  Dense bodies.
- E.
  
  Somatic nerve fibers.
18.

Which of the following would be caused by contraction of smooth muscle?
- A.
  
  Goose bumps
- B.
  
  Blood leaving the left ventricle of the heart
- C.
  
  Elevating the eyebrows
- D.
  
  Blinking the eyelids
- E.
  
  Deep inspiration
19.

Exposure to Clostridium tetani causes continuous release of acetylcholine. What effect does this have on smooth muscle?
- A.
  
  Flaccid paralysis
- B.
  
  Option 2
- C.
  
  Spastic paralysis
- D.
  
  Lockjaw
- E.
  
  No effect
- F.
  
  Myocardial atrophy
20.

Dystrophin, the protein that is defective in muscular dystrophy, is normally found
- A.
  
  Between the outermost myofilaments and the sarcolemma of a muscle fiber.
- B.
  
  As a transmembrane protein of the sarcolemma.
- C.
  
  In the Z discs of skeletal and cardiac muscle.
- D.
  
  In the dense bodies of smooth muscle.
- E.
  
  Bridging the gap between the sarcolemma and synaptic knob.
21.

Creatine kinase
- A.
  
  Donates one of its phosphate groups to ADP.
- B.
  
  Phosphorylates and activates certain enzymes in the sarcoplasm.
- C.
  
  Acts as a second messenger in muscle fibers.
- D.
  
  Catalyzes the transfer of phosphate from CP to ADP.
- E.
  
  Functions as a substitute for ATP during anaerobic fermentation.
22.

Release of acetylcholine at a neuromuscular junction
- A.
  
  Decreases the release of Ca2+ from the sarcoplasmic reticulum.
- B.
  
  Increases permeability of the sarcolemma to Na+.
- C.
  
  Decreases the positive charge on the sarcolemma.
- D.
  
  Lowers the threshold of the muscle fiber.
- E.
  
  Overrides the inhibitory effect of acetylcholinesterase.
23.

Loss of muscle mass from lack of activity is termed
- A.
  
  Myopathy.
- B.
  
  Dystrophy.
- C.
  
  Apathy.
- D.
  
  Atrophy.
- E.
  
  Treppe.
24.

Which of the following is not a characteristic of a muscle cell?
- A.
  
  Plasticity
- B.
  
  Contractility
- C.
  
  Conductivity
- D.
  
  Extensibility
- E.
  
  Excitability
25.

Collagen is
- A.
  
  Contractile.
- B.
  
  Excitable.
- C.
  
  Elastic.
- D.
  
  Expendable.
- E.
  
  Impermeable.