Cardiac output in L/min divided by hea rate equals:
**Core Concept**
The question tests understanding of basic cardiovascular physiology, specifically the relationship between **cardiac output**, **heart rate**, and **stroke volume**. Cardiac output is the volume of blood the heart pumps per minute.
**Why the Correct Answer is Right**
Cardiac output (CO) in L/min divided by heart rate (HR) in beats per minute gives **stroke volume** (SV), which is the volume of blood pumped by the left ventricle of the heart in one contraction. This relationship is expressed by the formula: CO = HR x SV. Thus, rearranging for SV gives SV = CO / HR.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not correctly represent the relationship between cardiac output, heart rate, and the resulting calculation.
**Option B:** Incorrect as it misrepresents the formula and physiological concept being tested.
**Option C:** Incorrect because it does not accurately describe the outcome of dividing cardiac output by heart rate.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that stroke volume is a critical determinant of cardiac output, and changes in stroke volume can significantly impact overall cardiac performance. Understanding this relationship is crucial for managing patients with cardiovascular diseases.
**Correct Answer:** Correct Answer: C. Stroke Volume.