Starling's law of the heart states that, within limits, the longer, or more stretched, the heart fibers are at the beginning of the contraction, the
weaker the contraction.
slower the heart rate.
faster the heart rate.
stronger the contraction.
The Correct Answer is D
A. weaker the contraction: This is the opposite of the law; a lack of stretch usually results in a weaker stroke volume.
B. slower the heart rate: Starling's Law deals with stroke volume (the force of the pump), not the electrical timing of the heart rate.
C. faster the heart rate: Heart rate is primarily controlled by the SA node and the autonomic nervous system, not fiber stretch.
D. stronger the contraction: Also known as the Frank-Starling mechanism, this law states that the more the cardiac muscle is stretched (due to increased blood filling the heart), the more forcefully it will contract to pump that blood out.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. kyphosis: Kyphosis is an exaggerated outward (posterior) curvature of the thoracic spine, often called "hunchback."
B. scoliosis: Scoliosis is an abnormal lateral (side-to-side) curvature of the spine.
C. Scheuermann disease: While this disease causes kyphosis in adolescents, the question asks for the name of the condition of the curvature itself.
D. lordosis: Lordosis is an exaggerated inward (anterior) curvature, typically found in the lumbar or cervical spine ("swayback").
Correct Answer is B
Explanation
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.
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