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
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
