Which of the following statements is the most correct regarding homeostatic imbalance?
Negative feedback mechanisms are functioning normally.
It is considered the cause of most diseases.
Positive feedback mechanisms are overwhelmed.
The internal environment is becoming more stable.
The Correct Answer is B
A. Negative feedback mechanisms are functioning normally: Negative feedback is the body’s primary way to maintain homeostasis by reversing changes. If these mechanisms are functioning normally, homeostatic imbalance would not occur.
B. It is considered the cause of most diseases: Homeostatic imbalance occurs when the body’s regulatory systems fail to maintain stability. This disruption underlies the development of many diseases, as the inability to restore balance leads to dysfunction and pathology.
C. Positive feedback mechanisms are overwhelmed: Positive feedback amplifies changes rather than stabilizing them. While uncontrolled positive feedback can contribute to imbalance, it is not the main principle behind most disease states.
D. The internal environment is becoming more stable: Stability of the internal environment defines homeostasis. When imbalance occurs, the internal environment is actually becoming less stable, which can progress to illness if not corrected.
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Related Questions
Correct Answer is E
Explanation
A. Polar solvent properties: Water’s polarity makes it an excellent solvent for ionic and polar substances, allowing chemical reactions to occur in the body. While this property is critical for metabolism, it is not related to the cooling effect of sweating.
B. Cushioning: Water provides cushioning by forming protective fluids such as cerebrospinal fluid and amniotic fluid, which absorb shocks. This protective role is important, but it does not explain how sweating helps regulate temperature.
C. Reactivity: Water participates in many chemical reactions, such as hydrolysis and dehydration synthesis. Although essential for metabolism, reactivity does not contribute to the cooling mechanism of sweating.
D. High heat capacity: Water resists temperature changes by absorbing or releasing large amounts of heat with minimal changes in its own temperature. This helps stabilize body temperature, but sweating specifically relies on a different property.
E. High heat of vaporization: Sweating demonstrates water’s high heat of vaporization, meaning it requires a significant amount of heat energy to change from liquid to vapor. As sweat evaporates from the skin, it absorbs body heat, producing a cooling effect.
Correct Answer is D
Explanation
A. The osmolarity decreases and the water concentration increases: Increasing solute concentration does not decrease osmolarity; higher solute levels actually increase osmolarity while reducing free water concentration.
B. The osmolarity decreases and the water concentration decreases: Increasing solute concentration raises osmolarity rather than lowering it, even though water concentration does decrease.
C. The osmolarity increases and the water concentration increases: While osmolarity rises with higher solute concentration, the water concentration does not increase; it decreases as water molecules are effectively bound by solutes.
D. The osmolarity increases and the water concentration decreases: Higher solute concentration increases osmolarity, creating a stronger driving force for water movement. At the same time, the concentration of free water decreases because more water molecules are associated with solutes.
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