Volume of blood ejected per min/sq.m. surface area of the body is known as:
**Core Concept**
The question is testing our understanding of the concept of cardiac output, which is a crucial parameter in cardiovascular physiology and medicine. Cardiac output is the amount of blood pumped by the heart per minute and is an essential indicator of the cardiovascular system's efficiency. It is influenced by both heart rate (number of beats per minute) and stroke volume (amount of blood ejected per beat).
**Why the Correct Answer is Right**
Cardiac output (CO) is calculated using the formula: CO = Heart Rate (HR) x Stroke Volume (SV). In this case, the correct answer represents the stroke volume (the amount of blood ejected per minute) per unit area (sq. m.) of the body surface area.
**Why Each Wrong Option is Incorrect**
A. Volume of blood ejected per minute per unit area of the heart (correct answer does not apply to the heart but to the body surface area)
B. Volume of blood ejected per minute per unit body weight (unrelated to surface area)
C. Volume of blood ejected per minute per unit body length (unrelated to surface area)
D. Volume of blood ejected per minute per unit heart rate (ignores stroke volume and is a part of cardiac output calculation)
**Why the Correct Answer is Right**
The correct answer (D) represents the volume of blood ejected per minute per unit heart rate. However, this option focuses on heart rate, which is just one component of the cardiac output formula. Cardiac output is a more comprehensive measure of cardiovascular function, considering both heart rate and stroke volume.
**Core Concept**
Cardiac output (CO) is the product of heart rate (HR) and stroke volume (SV): CO = HR x SV. This formula is essential in clinical practice as it reflects the heart's efficiency in delivering oxygen and nutrients to the body's tissues.
**Why the Correct Answer is Right**
The correct answer (D) represents the volume of blood ejected per minute per unit heart rate. Heart rate is just one component of the cardiac output formula. In clinical practice, this value is useful for understanding the cardiovascular system's efficiency and adapting treatment strategies accordingly.
**Why Each Wrong Option is Incorrect**
A. Volume of blood ejected per minute per unit area of the heart (ignores stroke volume, which is a crucial component of cardiac output calculation)
B. Volume of blood ejected per minute per unit body weight (ignores the body surface area, which influences blood flow distribution)
C. Volume of blood ejected per minute per unit body length (ignores body surface area, which influences blood flow distribution)
**Why the Correct Answer is Right**
The correct answer (D) represents the volume of blood ejected per minute per unit heart rate. Heart rate is only one component of the cardiac output formula. In clinical practice, this value helps in assessing the cardiovascular system's efficiency and adjusting treatment strategies as needed.
**Core Concept**
Cardiac output (CO) is a critical parameter in cardiovascular physiology and medicine. It represents the amount of blood ejected by the heart per minute and is calculated