For the following true-false questions, mark “A” for true and “B” for false. 66)

Question

For the following true-false questions, mark “A” for true and “B” for false.

66) Transverse tubules allow nutrients to be dispersed throughout very large muscle cells.
67) Skeletal muscle fibers have only one nucleus per cell.
68) Muscle twitch occurs when only a few muscle cells in the entire muscle are fully contracted.
69) Slow oxidative fibers have poor strength but excellent endurance.
70) Muscles can lengthen under their own power as well as contract.
71) Extensibility is not a feature of muscle tissue.
72) Tetanus is the recruitment of additional fibers during muscle contraction.
73) The term “sarco” refers to larger scale bone structure and organs.
74) Human muscle cells may produce lactic acid when they run out of oxygen.
75) Titin has a molecular weight of around 25000 Daltons.
76) G-Actin polymerizes to form F-Actin.
77) Thin filaments are composed exclusively of the protein Myosin.
78) Each thin filament consists of about 250 Myosin molecules.
79) The power stroke is generated during the latent phase.
80) Reformation of cross bridges occurs during the contraction-relaxation phase.
81) Creatine phosphate (phosphocreatine) carries extra oxygen in slow oxidative fibers.
82) Myosin gives fast oxidative fibers their characteristic color.

84) Fast oxidative fibers may develop more endurance with proper training and conditioning.
85) Creatine phospho-kinase attaches a phosphate group to creatinine.
86) A motor unit with one neuron per 10 muscle fibers will generate more precise movements than one
       with one neuron per 100 muscle fibers.
87) Muscle cells replicate via mitosis after a good righteous workout.
88) Synergistic muscles work with each other.
89) Muscle tissue, like your lab instructor’s evil twin before his morning coffee, is irritable.
90) An Olympic class weightlifter would have mostly slow oxidative muscle fibers.
91) Myoglobin is an oxygen carrying protein.
92) Troponin prevents overstretching of myofibrils.
93) Reactive hyperemia results from oxygen starvation caused by an occluded blood vessel.
94) Active hyperemia results from exercise or other increased metabolic demand.
95) The parasympathetic nervous system speeds up the SA node.
96) Einthoven’s triangle runs from both wrists to the left ankle.
97) The Aortic valve closes a few milliseconds after the pulmonary valve.
98) The mitral valve closes a few milliseconds before the tricuspid valve.
99) S4 is not considered to be indicative of a problem in young people or athletes.
59) Septic shock is caused by a sudden loss of blood volume.
100) Anaphylactic shock is caused by a massive allergic response.
101) Most blood vessels have some smooth muscle tissue in their walls.
102) Smaller blood vessels carry blood at a lower velocity than larger ones.
103) Flow rate decreases with increasing diameter of a blood vessel.
104) Positive inotropic chemicals decrease contractility of the myocardium.
105) Viscosity refers to the thickness of a fluid.
106) Hypertension is the condition of having insufficient blood pressure.
107) A single cardiac cycle moves approximately 5.2 liters of blood.
108) The sympathetic nervous system generates bradycardia.
109) Orthostatic hypotension is caused by getting out of bed and standing up.
110) Baroceptors are phasic receptors located in the walls of the aorta and carotid arteries.
111) Absorption moves material out of capillaries via bulk flow.
112) Transcytosis involves the movement of material through endothelial cells.
113) Vasoconstriction can increase systemic blood pressure.
114) Up to 95% of the body’s capillary beds may be inactive during periods of rest.

Explanation / Answer

Ans 66. True (A)

Ans 67. False (B) skeletal muscle fibres are multinucleate

Ans 68. True (A)

Ans 69. True (A)

Ans 70. False (B)

Ans 71. False (B) Excitability, contractility, extensibility and elasticity are important properties of muscle

Ans 73. False (B) the term sarco is referred to large scale muscle tissues and organs

Ans 74. True (A)

Ans 75. False (B)the molecular weight is 3,906,487.6 Daltons

Ans 76. True (A)

Ans 77. False (B) Thin filaments are composed of actin

Ans 78. False (B) Thick filament is composed of 250 myosin molecules

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