Q
Which of the following statements best describes Starling's Law?
As venous return increases, stroke volume will increase.
Blood flow moves in layers with the highest velocity layer in the center of the vessel.
Small changes in vessel radius will cause significant changes in the resistance to flow.
An increase in heart rate or stroke volume will cause an increase in cardiac output.
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Answer
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Step 1:I'll solve this problem step by step, focusing on Starling's Law:
Step 2:: Understanding Starling's Law
Starling's Law, more specifically known as the Frank-Starling Law or Starling's Law of the Heart, describes the relationship between the stretching of cardiac muscle fibers and the force of cardiac muscle contraction.
Step 3:: Analyzing the Mechanism
The law states that within physiological limits, the heart will pump out whatever blood returns to it. As venous return increases, the cardiac muscle fibers are stretched more, which leads to: - Increased muscle fiber length - Greater contractile force - Increased stroke volume
Step 4:: Evaluating the Given Options
Let's examine each statement:
Step 5:"As venous return increases, stroke volume will increase" - \checkmark This is CORRECT and directly describes Starling's Law.
Step 6:
Blood flow layers description - Incorrect (relates to fluid dynamics, not Starling's Law)
Step 7:
Vessel radius and resistance - Incorrect (not related to Starling's Law)
Step 8:
Heart rate and cardiac output - Partially related but not the specific definition
Final Answer
Option 1 - "As venous return increases, stroke volume will increase" best describes Starling's Law.
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