Ch 11 muscle tissue - multiple choice

5) The delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together is the A) Endomysium. B) Perimysium. C) Epimysium. D) Superficial fascia. E) Periosteum.

A) Endomysium.

39) A muscle producing peak tension with rapid cycles of contraction and relaxation is said to be in A) Incomplete tetanus. B) Complete tetanus. C) Treppe. D) Wave summation. E) Recruitment

A) Incomplete tetanus.

82) When acetylcholine binds to receptors at the motor end plate, the muscle membrane becomes A) More permeable to sodium ions. B) Less permeable to sodium ions. C) More permeable to potassium ions. D) Less permeable to potassium ions. E) Repolarized

A) More permeable to sodium ions.

10) The cell membrane of skeletal muscle is called the A) Sarcolemma. B) Sarcomere. C) Sarcosome. D) Sarcoplasmic reticulum. E) Sarcoplasm.

A) Sarcolemma.

33) When calcium ion binds to troponin A) Tropomyosin moves out of the groove between the actin molecules B) Actin sites on the myosin are exposed C) Actin heads will bind to myosin D) Muscle relaxation occurs E) Myosin shortens

A) Tropomyosin moves out of the groove between the actin molecules

37) The type of contraction represented by a single stimulus/contraction/relaxation sequence is a(n) A) Twitch. B) Incomplete tetanus. C) Complete tetanus. D) Summation. E) Incomplete summation

A) Twitch.

16) Thin filaments at either end of the sarcomere are attached to the A) Z line. B) M line. C) H band. D) A band. E) I band

A) Z line.

87) Which of the following muscles would produce the greater tension? A) a muscle with 20 motor units active B) a muscle with 10 motor units active

A) a muscle with 20 motor units active

78) Which of the following is greater? A) the concentration of calcium ion in the sarcoplasmic reticulum of a resting muscle B) the concentration of calcium ion in the sarcoplasm of a resting muscle

A) the concentration of calcium ion in the sarcoplasmic reticulum of a resting muscle

22) The skeletal muscle complex known as the triad consists of A) Actin, myosin, and filaments. B) A transverse tubule and terminal cisternae. C) Filaments, myofibrils, and sarcomeres. D) A bands, H bands, and I bands. E) Actin, myosin, and sarcomeres

B) A transverse tubule and terminal cisternae.

34) The most important factor in decreasing the intracellular concentration of calcium ion after contraction is A) Active transport of calcium across the sarcolemma. B) Active transport of calcium into the sarcoplasmic reticulum. C) Active transport of calcium into the synaptic cleft. D) Diffusion of calcium out of the cell. E) Diffusion of calcium into the sarcoplasmic reticulum.

B) Active transport of calcium into the sarcoplasmic reticulum.

41) A muscle that is stimulated so frequently that the relaxation phase is completely eliminated is said to exhibit A) Incomplete tetanus. B) Complete tetanus. C) Treppe. D) Wave summation. E) Recruitment.

B) Complete tetanus.

3) The dense layer of collagen fibers that surround an entire skeletal muscle is the A) Tendon. B) Epimysium. C) Endomysium. D) Perimysium. E) Fascicle.

B) Epimysium.

7) Muscle fibers differ from "typical cells" in that muscle fibers A) Lack a cell membrane. B) Have many nuclei. C) Are very small. D) Lack mitochondria. E) both B and C

B) Have many nuclei.

28) Receptors for acetylcholine are located on the A) Synaptic knob. B) Motor end plate. C) Sarcomere. D) Synaptic cleft. E) Transverse tubule

B) Motor end plate.

13) The functional unit of a skeletal muscle fiber is the A) Sarcolemma. B) Sarcomere. C) Sarcoplasmic reticulum. D) Myofibril. E) Myofilament

B) Sarcomere.

12) The series of membranous channels that surround each myofibril is the A) Sarcolemma. B) Sarcoplasmic reticulum. C) Myolemma. D) Sarcoplasm. E) Transverse tubule.

B) Sarcoplasmic reticulum.

6) The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is called a(n) A) Fascicle. B) Tendon. C) Ligament. D) Epimysium. E) Myofibril

B) Tendon.

99) During muscle contraction, myosin cross bridges attach to active sites of: A) myosin filaments B) actin filaments C) Z lines D) thick filaments E) the H zone

B) actin filaments

47) When energy reserves in a muscle are exhausted and lactic acid levels increase, ________ occurs. A) an oxygen debt B) fatigue C) treppe D) tetanus E) atrophy

B) fatigue

17) The area of the sarcomere containing the thick filaments is the A) Z line. B) M line. C) A band. D) I band.

C) A band.

44) A resting muscle generates most of its ATP by A) Conversion of creatine phosphate. B) Anaerobic respiration. C) Aerobic respiration. D) Glycogenolysis. E) The tricarboxylic acid cycle.

C) Aerobic respiration.

30) Active sites on the actin become available for binding when A) Actin binds to troponin. B) Troponin binds to tropomyosin. C) Calcium binds to troponin. D) Calcium binds to tropomyosin. E) Myosin binds to troponin.

C) Calcium binds to troponin.

81) How would blocking the activity of acetylcholinesterase affect skeletal muscle? A) It would make the muscles less excitable. B) It would produce muscle weakness. C) It would cause spastic paralysis (muscles are contracted and unable to relax). D) It would cause flaccid paralysis (muscles are relaxed and unable to contract). E) It would have no effect on skeletal muscles.

C) It would cause spastic paralysis (muscles are contracted and unable to relax).

14) Interactions between actin and myosin filaments of the sarcomere are responsible for A) Muscle fatigue. B) The conduction of neural stimulation to the muscle fiber. C) Muscle contraction. D) Muscle relaxation. E) The striped appearance of skeletal muscle.

C) Muscle contraction.

9) Skeletal muscle fibers are formed from embryonic cells called A) Sarcomeres. B) Myofibrils. C) Myoblasts. D) Fascicles. E) Myomeres

C) Myoblasts.

26) Each skeletal muscle fiber is controlled by a neuron at a single A) Synaptic knob. B) Sarcomere. C) Neuromuscular junction. D) Synaptic cleft. E) Transverse tubule

C) Neuromuscular junction.

29) Action potentials are conducted into a skeletal muscle fiber by A) Motor end plates. B) Neuromuscular junctions. C) Transverse tubules. D) Triads. E) Sarcoplasmic reticulum

C) Transverse tubules.

24) At rest, active sites on the actin are blocked by A) Myosin molecules. B) Troponin molecules. C) Tropomyosin molecules. D) Calcium ions. E) ATP molecules

C) Tropomyosin molecules.

25) At rest, the tropomyosin molecule is held in place by A) Actin molecules. B) Myosin molecules. C) Troponin molecules. D) ATP molecules. E) Calcium ions.

C) Troponin molecules.

85) When contraction occurs, A) The H and I bands get smaller. B) The width of the A band remains constant. C) The Z lines move closer together. D) A, B, and C E) none of the above

D) A, B, and C

31) In response to action potentials arriving from the transverse tubules, the sarcoplasmic reticulum releases A) Acetylcholine. B) Sodium ions. C) Potassium ions. D) Calcium ions E) Hydrogen ions.

D) Calcium ions

21) The sarcoplasmic reticulum stores A) Oxygen. B) Glycogen. C) ATP. D) Calcium ions. E) Glucose.

D) Calcium ions.

80) After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as A) Tetany. B) Treppe. C) Depolarization. D) Rigor mortis. E) Oxygen debt.

D) Rigor mortis.

27) The space between the neuron and the muscle is the A) Synaptic knob. B) Motor end plate. C) Motor unit. D) Synaptic cleft. E) M line

D) Synaptic cleft.

38) When a muscle is stimulated repeatedly for several seconds with a constant stimulus, the amount of tension gradually increases to a maximum. This phenomenon is called A) Incomplete tetanus. B) Complete tetanus. C) A twitch. D) Wave summation. E) Recruitment

D) Wave summation.

40) If a second stimulus arrives before the relaxation phase has ended, a second, more powerful contraction occurs. This is called A) Incomplete tetanus. B) Complete tetanus. C) Treppe. D) Wave summation. E) Recruitment.

D) Wave summation.

102) Muscle tone is: A) the feeling of well-being following exercise B) the ability of a muscle to maintain a contraction against an outside force C) the condition of athletes after intensive training D) a state of sustained partial muscular contraction that is vital for the health of muscles E) the result of increased neuromuscular system coordination and increased metabolic rate

D) a state of sustained partial muscular contraction that is vital for the health of muscles

1) Which of the following is not a function of skeletal muscle? A) produce movement B) maintain posture C) maintain body temperature D) all of the above are functions of the skeletal muscle E) A and B only

D) all of the above are functions of the skeletal muscle

32) Which of the following acts as an ATPase during the contraction cycle of muscle? A) actin molecules B) troponin molecules C) tropomyosin molecules D) myosin cross-bridges E) the tail portion of the myosin molecule

D) myosin cross-bridges

36) Calcium ions are released from the sarcoplasmic reticulum during the ________ of contraction. A) latent period B) contraction phase C) recovery phase D) relaxation phase E) A and B

E) A and B

18) The area of the sarcomere that contains only thin filaments is the A) Z line. B) M line. C) H band. D) A band. E) I band

E) I band

43) The type of contraction in which the muscle fibers produce increased tension but do not shorten is called A) Tetany. B) Treppe. C) Concentric D) Isotonic. E) Isometric

E) Isometric

11) The cytoplasm of a skeletal muscle fiber is called the A) Sarcolemma. B) Sarcomere. C) Sarcosome. D) Sarcoplasmic reticulum. E) Sarcoplasm

E) Sarcoplasm

97) A motor unit consists of: A) a skeletal muscle and all the neurons that supply it B) a nerve and all of the skeletal muscles supplied by it C) all of the neurons that stimulate a single action D) all of the skeletal muscles that accomplish a single movement E) a neuron and all of the skeletal muscle fibers that it stimulates

E) a neuron and all of the skeletal muscle fibers that it stimulates

98) Acetylcholine is: A) an ion pump B) a source of energy for muscle contraction C) a component of thick myofilaments D) an oxygen binding protein E) a neurotransmjtter

E) a neurotransmjtter

100) A muscle twitch differs from a tetanic contraction in that: A) the tetanic contraction is considered abnormal, while the twitch is a normal muscle response B) the tetanic contraction is caused by a single stimulus, while the twitch is caused by very rapid multiple stimuli C) the muscle twitch is prolonged and continuous while a tetanic contraction is brief and jerky D) the muscle twitch occurs only in small muscles while a tetanic contraction occurs in large muscle groups E) the muscle twitch is a brief and jerky movement, while the tetanic contraction is prolonged and continuous

E) the muscle twitch is a brief and jerky movement, while the tetanic contraction is prolonged and continuous