What is the role of fluid balance in regulating body temperature?
Fluids store heat inside the body's tissues
Fluid shifts increase body temperature by reducing sweat production.
Adequate hydration facilitates perspiration, whose evaporation helps to cool the body.
It insulates the body against heat changes
The fluid within the brain directly absorbs heat from the environment.
The Correct Answer is C
A. Fluids store heat inside the body's tissues: Water possesses a high specific heat capacity, allowing it to absorb significant thermal energy with minimal temperature changes. This property facilitates heat distribution rather than static storage within peripheral tissues. It prevents rapid fluctuations in core body temperature during metabolic activity.
B. Fluid shifts increase body temperature by reducing sweat production: Hemodynamic shifts prioritize vital organ perfusion during hypovolemia, which may secondary limit cutaneous blood flow. While reduced sweating occurs in severe dehydration, this is a failure of thermoregulation rather than a primary regulatory role. It leads to hyperthermia.
C. Adequate hydration facilitates perspiration, whose evaporation helps to cool the body: Eccrine glands secrete hypotonic sweat onto the epithelial surface to facilitate heat loss via latent heat of vaporization. Maintaining plasma volume ensures consistent cutaneous vasodilation and sudomotor activity. This mechanism is the primary physiological response to thermal stress.
D. It insulates the body against heat changes: Adipose tissue, rather than aqueous fluid, provides significant thermal insulation for the human body. While water helps distribute heat, it does not act as a barrier to environmental thermal transfer. Proper fluid balance supports active cooling rather than passive insulation.
E. The fluid within the brain directly absorbs heat from the environment: Cerebrospinal fluid cushions the central nervous system and maintains chemical homeostasis within the cranium. It does not interface with the external environment to absorb or dissipate environmental heat. Thermoregulation is managed by the hypothalamus through systemic physiological responses.
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Related Questions
Correct Answer is B
Explanation
A. equation shifts left, respiratory acidosis, hypoventilation: Respiratory acidosis is caused by the retention of carbon dioxide, not the loss of gastric hydrochloric acid. A leftward shift would occur to consume excess hydrogen ions, which contradicts the loss of acid. Hypoventilation is a response to alkalosis.
B. equation shifts right, metabolic alkalosis, hypoventilation: Loss of gastric protons causes a rise in systemic pH, characterizing metabolic alkalosis. To replace the lost hydrogen ions, the carbonic acid-bicarbonate equation shifts right. The lungs then slow the breathing rate to retain carbon dioxide and lower pH.
C. equation shifts right, metabolic acidosis, hyperventilation: Metabolic acidosis involves an excess of hydrogen ions, which is the opposite of what occurs during vomiting. Hyperventilation is the compensation for acidemia, intended to blow off carbon dioxide. Vomiting specifically depletes acids, leading to an alkaline state.
D. equation shifts left, metabolic alkalosis, hyperventilation: While metabolic alkalosis is the correct diagnosis, a leftward shift would only occur if there were an excess of hydrogen and bicarbonate. Furthermore, hyperventilation would worsen alkalosis by removing more acid. The body compensates by slowing respiration to retain acid.
Correct Answer is B
Explanation
A. The cell begins to divide uncontrollably: Uncontrolled cellular proliferation is typically a result of genetic mutations or dysregulated signaling pathways rather than acute intracellular dehydration. Dehydration generally inhibits metabolic activity and halts the cell cycle. Chronic water deficit leads to apoptosis rather than hyperplasia.
B. The cytosol becomes overly concentrated with solutes, impairing function: Loss of intracellular water increases the molarity of cytosolic electrolytes and proteins, leading to cellular crenation. This hypertonic state disrupts the delicate spatial arrangement of organelles and molecular interactions. Essential biochemical pathways, including protein synthesis, become severely inhibited.
C. The cytosol becomes diluted and inactive: Dilution of the cytosol occurs during cellular swelling or water intoxication, where free water influx exceeds solute concentration. Low intracellular water levels result in a highly concentrated, not diluted, environment. Inactivity in this context stems from molecular crowding.
D. The cell gains energy efficiency: Dehydration places significant metabolic stress on the cell, requiring active transport mechanisms to attempt to restore osmotic balance. This increased workload consumes adenosine triphosphate and reduces overall metabolic efficiency. A dehydrated state is physiologically taxing and potentially lethal.
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