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PNB 2250 Exam 3 Complete Questions And Answers With Latest Quiz
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PNB 2250 Exam 3 Complete Questions And Answers With Latest Quiz Of the following, which is NOT a strategy by which endotherms generate internal heat: ANS Panting The minimal metabolic activity required to maintain bodily functions in a mammal is known as the ANS basal metabolic rate. Which...

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  • October 9, 2024
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  • 2024/2025
  • Exam (elaborations)
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  • pnb 2250 exam 3
  • pnb 2250 exam 3 complete questions and answers wit
  • pnb 2250 exam 3 complete questions
  • of the following which is not a strategy by which

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PNB 2250 Exam 3 Complete Questions And Answers
With Latest Quiz
Of the following, which is NOT a strategy by which endotherms generate internal heat: ANS
Panting


The minimal metabolic activity required to maintain bodily functions in a mammal is known as the
ANS basal metabolic rate.


Which of the following thermoregulatory mechanisms can be used to restrict blood flow to the skin,
and thus decreases heat loss by keeping the warmed blood closer to the core of the body? ANS
vasoconstriction


Poikilothermic ectotherms that live in thermally variable environments manage to maintain a
relatively stable body temperature. ANS False



Which of the following statements is NOT true? ANS Endotherms gain all their heat from
internal, biochemical reactions.


According to the second law of thermodynamics, as life become more organized the environment
becomes disorganized. ANS True



Which of the following is true for LARGER animals in comparison to SMALLER animals? ANS
Mass-specific BMR is lower in larger animals, because of a low Surface Area:Volume ratio



With respect to thermal adaptation, amphibians are considered to be ANS ectothermic



Almost all expended energy eventually becomes heat, in accordance with the: ANS Second law
of thermodynamics


The transfer of energy from the sun to the earth is ____________ . ANS radiation

,Ectotherms are always poikilotherms, and endotherms are always homeotherms ANS false



Metabolism is __________ . ANS reactions that consume ATP


reactions that produce ATP


anabolic reactions


reactions that break molecules down into smaller molecules


ALL OF THE ABOVE


Respiratory Quotient is ____________ . ANS Ratio of CO2 produced / Oxygen consumed



Non-shivering thermogenesis, a strategy used by many small mammals involves: ANS Oxidizing
BAT to produce heat



Temporal heterotherms such as the ____________ regulate heat by ____________ . ANS
Hummingbird; going into daily torpor to reduce energy demands


The direct transfer of energy from objects of differing temperature that are in contact with each other
is _______________ . ANS conduction



The swordfish's heater organ involves all of the following EXCEPT ___________ . ANS
Oxidation of brown adipose tissue



The principal role of calcium in skeletal muscle contraction is to ANS bind troponin, which in
turn permits tropomyosin to uncover the cross-bridge binding site on the thin filament.



A vertebrate motor unit is ANS a motor neuron and the muscle fibers it innervates

, When a skeletal muscle contracts, ___________ ANS Actin filaments slide inward along myosin
filaments, making the I band more narrow


The width of the A band stays constant


Cross-bridges form between energized myosin heads and actin binding sites


ALL OF THE ABOVE ARE CORRECT


_________________ provides a ready supply of high energy phosphate for conversion of ADP to
ATP during muscle activity. ANS Creatine-phosphate



Which fibers will have a rich blood supply and a high myoglobin content? ANS slow fibers



In order to swim, __________ utilize lateral undulations of the spine to generate propulsion ANS
Fish
Salamanders
Dolphins


Both A and B are correct



In spinal reflex pathways, motor neurons receive inputs from ANS sensory afferents and/or
internurons



Match each item with the correct statement below: ANS Nicotinic acetylcholine receptors:
Motor endplate


Dihydropyridine (DHP) receptor:
T tubule

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