BIO 242 Exam 1 – 3 With Complete Solutions
If a patient is given an intravenous solution containing 150 mM NaCl, his or her red
blood cells will __________. - ANSWER-not change size or shape
Which of the following transport mechanisms may be utilized to move glucose
across cell membranes? - ANSWER--secondary active transport
-facilitated diffusion
If a cell's membrane potential (Vm) = -70 mV, and the equilibrium potential for
potassium in this cell (EK+) = -90 mV, K+ ions will move - ANSWER-out of the cell
White blood cells engulf bacteria in a process known as __________. - ANSWER--
phagocytosis
-endocytosis
Which of the following statements about epithelial transport is(are) true? -
ANSWER--The Na+/K+ ATPase is found only in the basolateral membrane of
epithelial cells.
-The movement of Na+ ions across the apical membrane of epithelial cells is
dependent on the electrochemical gradient created by the Na+/K+ ATPase.
,If a sodium ion is attracted to the inside of a cell, __________. - ANSWER-there
must be a net excess of negative charges inside the cell with respect to the
outside
If a cell's Vm = -70 mV and ENa+ = +50 mV, which way will Na+ ions move across
the cell membrane? - ANSWER-Na+ ions will move into the cell.
Which of the following statements about facilitated diffusion is(are) true? -
ANSWER--The rate of facilitated diffusion is directly dependent on the affinity of
the solute for the carrier protein.
-The rate of facilitated diffusion is directly dependent on the concentration
gradient of the solute across the membrane.
The term simple diffusion can be used to describe __________. - ANSWER--the
movement of oxygen molecules across the cell membrane
-the movement of oxygen molecules in air
An increase in which of the following would increase the rate of diffusion of
oxygen molecules across pulmonary cell membranes? - ANSWER--membrane
surface area
-he oxygen concentration inside the lung
-temperature
,Which of the following molecules would not diffuse through cell membranes
easily? - ANSWER--Na+ ions
-glucose
If many solutes are constantly being pumped into or out of cells, why don't the
intracellular concentrations of these solutes change? - ANSWER-For any given
solute, the rate of active transport in one direction is equal to the passive
movement (leak) of the solute in the opposite direction.
Which of the following is an example of an endocrine gland? - ANSWER-Pituitary
gland
Fluid is eliminated from the body by the process of - ANSWER-Excretion
A mechanism that "corrects" the deviation of a physiological variable from its set
point is called - ANSWER-Negative feedback
Positive feedback mechanisms - ANSWER-require a stop signal to prevent a
change in a physiological variable from going out of control
Exchange of materials between the blood and the external environment occurs at
the - ANSWER--gastrointestinal tract
-lungs
, -kidneys
Both intracellular and extracellular fluids contain _____. - ANSWER--sodium
-potassium
-proteins
In type I diabetes mellitus, the hormone ____________ is not being secreted by the
pancreas. - ANSWER-Insulin
The maintenance of a constant internal environment despite changes in the
external environment is termed __________. - ANSWER-Homeostasis
A homeostatic set point _____. - ANSWER-is the central tendency of a
physiological parameter
Muscle cells are found in the __________. - ANSWER--stomach
-walls of blood vessels
-heart
The functions of epithelial cells include __________. - ANSWER-acting as a physical
barrier to the movement of molecules
If a patient is given an intravenous solution containing 150 mM NaCl, his or her red
blood cells will __________. - ANSWER-not change size or shape
Which of the following transport mechanisms may be utilized to move glucose
across cell membranes? - ANSWER--secondary active transport
-facilitated diffusion
If a cell's membrane potential (Vm) = -70 mV, and the equilibrium potential for
potassium in this cell (EK+) = -90 mV, K+ ions will move - ANSWER-out of the cell
White blood cells engulf bacteria in a process known as __________. - ANSWER--
phagocytosis
-endocytosis
Which of the following statements about epithelial transport is(are) true? -
ANSWER--The Na+/K+ ATPase is found only in the basolateral membrane of
epithelial cells.
-The movement of Na+ ions across the apical membrane of epithelial cells is
dependent on the electrochemical gradient created by the Na+/K+ ATPase.
,If a sodium ion is attracted to the inside of a cell, __________. - ANSWER-there
must be a net excess of negative charges inside the cell with respect to the
outside
If a cell's Vm = -70 mV and ENa+ = +50 mV, which way will Na+ ions move across
the cell membrane? - ANSWER-Na+ ions will move into the cell.
Which of the following statements about facilitated diffusion is(are) true? -
ANSWER--The rate of facilitated diffusion is directly dependent on the affinity of
the solute for the carrier protein.
-The rate of facilitated diffusion is directly dependent on the concentration
gradient of the solute across the membrane.
The term simple diffusion can be used to describe __________. - ANSWER--the
movement of oxygen molecules across the cell membrane
-the movement of oxygen molecules in air
An increase in which of the following would increase the rate of diffusion of
oxygen molecules across pulmonary cell membranes? - ANSWER--membrane
surface area
-he oxygen concentration inside the lung
-temperature
,Which of the following molecules would not diffuse through cell membranes
easily? - ANSWER--Na+ ions
-glucose
If many solutes are constantly being pumped into or out of cells, why don't the
intracellular concentrations of these solutes change? - ANSWER-For any given
solute, the rate of active transport in one direction is equal to the passive
movement (leak) of the solute in the opposite direction.
Which of the following is an example of an endocrine gland? - ANSWER-Pituitary
gland
Fluid is eliminated from the body by the process of - ANSWER-Excretion
A mechanism that "corrects" the deviation of a physiological variable from its set
point is called - ANSWER-Negative feedback
Positive feedback mechanisms - ANSWER-require a stop signal to prevent a
change in a physiological variable from going out of control
Exchange of materials between the blood and the external environment occurs at
the - ANSWER--gastrointestinal tract
-lungs
, -kidneys
Both intracellular and extracellular fluids contain _____. - ANSWER--sodium
-potassium
-proteins
In type I diabetes mellitus, the hormone ____________ is not being secreted by the
pancreas. - ANSWER-Insulin
The maintenance of a constant internal environment despite changes in the
external environment is termed __________. - ANSWER-Homeostasis
A homeostatic set point _____. - ANSWER-is the central tendency of a
physiological parameter
Muscle cells are found in the __________. - ANSWER--stomach
-walls of blood vessels
-heart
The functions of epithelial cells include __________. - ANSWER-acting as a physical
barrier to the movement of molecules
