A 25 year old man has muscle blood flow of 500ml/min. He has mean arterial pressure of 160mmHg and mean venous pressure of 10mmHg of muscle. Calculate vascular resistance of the muscle of this man.
**Core Concept**
Vascular resistance is a measure of the opposition to blood flow in a given vascular bed, calculated as the ratio of the mean arterial pressure to the blood flow. It is an essential concept in understanding the regulation of blood flow and blood pressure.
**Why the Correct Answer is Right**
To calculate vascular resistance, we use the formula: Vascular Resistance = Mean Arterial Pressure / Blood Flow. Given that the mean arterial pressure is 160mmHg and the blood flow is 500ml/min, we can plug these values into the formula. However, we need to convert the units of blood flow from milliliters per minute (ml/min) to liters per minute (L/min) to match the units of pressure (mmHg). There are 1000 milliliters in 1 liter, so 500 ml/min = 0.5 L/min. Now we can calculate vascular resistance: Vascular Resistance = 160 mmHg / 0.5 L/min.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we cannot evaluate it.
**Option B:** This option is also not provided, so we cannot evaluate it.
**Option C:** This option is not provided, so we cannot evaluate it.
**Option D:** This option is also not provided, so we cannot evaluate it.
**Clinical Pearl / High-Yield Fact**
Remember that vascular resistance is a key determinant of blood pressure and is influenced by factors such as blood flow, mean arterial pressure, and the caliber of blood vessels.
**Correct Answer:** C. This option is not provided, so we cannot evaluate it.