Chpt. 10 & 11 Multiple Choice II Created By Day
- 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.
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