BIO 270 Exam 1 JMU Hynd || Most Recent 2025/2026 Actual
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Compensatory physiological responses - ANSWER-counter-
reactions by body
systems minimize change (ex: body adds more sodium to urine
in response to
oversaturation)
Intrinsic controls - ANSWER-_______ controls are built into
the organ (ex:
chemicals released from exercising increase
blood flow)
Extrinsic control - ANSWER-________ controls come from
outside the organ
(ex: neural and hormonal control of low
blood pressure)
Dynamic steady state - ANSWER-System in which a particular
variable is not
,changing, but energy needed to maintain the
variable constant
-Concentration gradients
-Electrical gradients - ANSWER-Particles that penetrate the
plasma membrane are driven by which two forces
Concentration gradients - ANSWER-high concentration on one
side, low conc.
on the other
side
(substances go from high to low
concentration)
Solution = solute + solvent - ANSWER-Solution = ______ +
_______
Solute - ANSWER-Dissolved substance in solution
Solvent - ANSWER-Dissolving medium (ex: water)
Concentration - ANSWER-Amount of solute dissolved in a
solution
Absolute Zero - ANSWER-Temperature where molecules stop
moving
Simple diffusion - ANSWER-Uniform spreading out of
molecules
, Concentration gradient - ANSWER-Difference in concentration
in between two
adjacent
areas
Diffusion - ANSWER--Movement of molecules from one place to
another solely
based on random thermal
motion
-Passive movement from high concentration to low
concentration
Diffusion through a barrier - ANSWER-- if substance is
PERMEABLE, diffusion
down concentration gradient NO ENERGY
REQUIRED
- if substance is IMPERMEABLE, no diffusion -
concentration gradient is
irrelevant
-Magnitude of concentration gradient (diff in conc. on each
side)
-Surface area of membrane
-Lipid solubility (substances soluble in lipids diffuse faster thru
membrane)
-Molecular weight (rate of diffusion decreases as weight
increases)
Complete Real Exam Questions And Verified Answers | 100%
Correct Answers Graded A+ / Guaranteed Success!! Newest
Exam / Just Released!!!
Compensatory physiological responses - ANSWER-counter-
reactions by body
systems minimize change (ex: body adds more sodium to urine
in response to
oversaturation)
Intrinsic controls - ANSWER-_______ controls are built into
the organ (ex:
chemicals released from exercising increase
blood flow)
Extrinsic control - ANSWER-________ controls come from
outside the organ
(ex: neural and hormonal control of low
blood pressure)
Dynamic steady state - ANSWER-System in which a particular
variable is not
,changing, but energy needed to maintain the
variable constant
-Concentration gradients
-Electrical gradients - ANSWER-Particles that penetrate the
plasma membrane are driven by which two forces
Concentration gradients - ANSWER-high concentration on one
side, low conc.
on the other
side
(substances go from high to low
concentration)
Solution = solute + solvent - ANSWER-Solution = ______ +
_______
Solute - ANSWER-Dissolved substance in solution
Solvent - ANSWER-Dissolving medium (ex: water)
Concentration - ANSWER-Amount of solute dissolved in a
solution
Absolute Zero - ANSWER-Temperature where molecules stop
moving
Simple diffusion - ANSWER-Uniform spreading out of
molecules
, Concentration gradient - ANSWER-Difference in concentration
in between two
adjacent
areas
Diffusion - ANSWER--Movement of molecules from one place to
another solely
based on random thermal
motion
-Passive movement from high concentration to low
concentration
Diffusion through a barrier - ANSWER-- if substance is
PERMEABLE, diffusion
down concentration gradient NO ENERGY
REQUIRED
- if substance is IMPERMEABLE, no diffusion -
concentration gradient is
irrelevant
-Magnitude of concentration gradient (diff in conc. on each
side)
-Surface area of membrane
-Lipid solubility (substances soluble in lipids diffuse faster thru
membrane)
-Molecular weight (rate of diffusion decreases as weight
increases)
