Question

Considering the stroke volume of an adult healthy human being is 70 mL, identify the cardiac output in one hour from the following :

• A. 50.40 Lit/hour
• B. 504.0 Lit/hour
• C. 30.24 Lit/hour
• D. 302.4 Lit/hour

Answer 1

The Correct Option is D

Identify the given information:

• Stroke Volume (SV) of an adult healthy human = 70 mL/beat
• Identify the required information:
  • Cardiac Output (CO) in one hour (Lit/hour)
• Recall the definition and formula for Cardiac Output:
  • Cardiac Output (CO) is the volume of blood pumped by the heart per unit time.
  • The formula for Cardiac Output per minute is: \( \text{CO} = \text{Stroke Volume (SV)} \times \text{Heart Rate (HR)} \)
• Assume a standard Heart Rate (HR):
  • The question asks for a healthy adult, but doesn't provide the heart rate. A typical resting heart rate for a healthy adult is approximately 72 beats per minute. We will use this standard value.
  • HR = 72 beats/minute
• Calculate the Cardiac Output per minute:
  • \( \text{CO}_{\text{minute}} = \text{SV} \times \text{HR} \)
  • \( \text{CO}_{\text{minute}} = 70 \text{ mL/beat} \times 72 \text{ beats/minute} \)
  • \( \text{CO}_{\text{minute}} = 5040 \text{ mL/minute} \)
• Convert Cardiac Output from mL/minute to Lit/hour:
  • First, convert mL/minute to mL/hour. There are 60 minutes in an hour.
  • \( \text{CO}_{\text{hour}} = \text{CO}_{\text{minute}} \times 60 \text{ minutes/hour} \)
  • \( \text{CO}_{\text{hour}} = 5040 \text{ mL/minute} \times 60 \text{ minutes/hour} \)
  • \( \text{CO}_{\text{hour}} = 302400 \text{ mL/hour} \)
  • Next, convert mL/hour to Lit/hour. There are 1000 mL in 1 Liter.
  • \( \text{CO}_{\text{hour}} = \frac{302400 \text{ mL/hour}}{1000 \text{ mL/Lit}} \)
  • \( \text{CO}_{\text{hour}} = 302.4 \text{ Lit/hour} \)

The correct answer is (D) : 302.4 Lit/hour.

Answer 2

The correct answer is: (D) 302.4 Lit/hour.

Cardiac output (CO) refers to the volume of blood pumped by the heart per minute. It is calculated as the product of stroke volume (SV) and heart rate (HR). The formula is:

Cardiac Output (CO) = Stroke Volume (SV) × Heart Rate (HR)

Given data:

• Stroke volume (SV) = 70 mL (The amount of blood pumped by the heart with each beat)
• Heart rate (HR) = 72 beats per minute (The number of heartbeats per minute)

Step 1: Calculate the cardiac output in mL/min:

CO = 70 mL × 72 beats/min = 5040 mL/min

Step 2: Convert mL to Liters:

CO = 5040 mL/min ÷ 1000 = 5.04 L/min

Step 3: Convert L/min to L/hour:

Cardiac Output (1 hour) = 5.04 L/min × 60 = 302.4 L/hour

Therefore, the correct cardiac output in one hour is 302.4 Lit/hour.