Homeostasis can best be described as:
a constant state maintained by living and nonliving organisms.
a state of relative constancy.
adaptation to the external environment.
changes in body temperature.
The Correct Answer is B
A. a constant state maintained by living and nonliving organisms: Nonliving organisms do not maintain homeostasis.
B. a state of relative constancy: Homeostasis is not a "fixed" point but a dynamic equilibrium where variables fluctuate within a narrow, healthy range.
C. adaptation to the external environment: This is a broader biological concept; homeostasis is specifically about maintaining the internal environment.
D. changes in body temperature: This is just one example of a homeostatic variable, not the definition of the concept itself.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. estrogen: This hormone promotes the development of the duct system in the breasts but does not trigger milk secretion.
B. oxytocin: This hormone causes the ejection (let-down) of milk by contracting cells around the alveoli; it does not stimulate the actual production/secretion of milk into the alveoli.
C. prolactin: Produced by the anterior pituitary, prolactin is the primary hormone responsible for stimulating the mammary glands to synthesize and secrete milk.
D. estrogen: This hormone promotes the development of the duct system in the breasts but does not trigger milk secretion.
Correct Answer is B
Explanation
A. hemostasis: This is the general term for the process of stopping bleeding, which includes clot formation, not dissolution.
B. fibrinolysis: Fibrinolysis is the enzymatic breakdown of the fibrin mesh in blood clots, primarily performed by the enzyme plasmin.
C. erythroblastosis: This refers to the abnormal presence of erythroblasts (immature red blood cells) in the blood, usually related to hemolytic disease.
D. diapedesis: This is the process of white blood cells "squeezing" through capillary walls to enter tissues.
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