The heart pumps 50 liters of blood per minute at rest Also a

The heart pumps 5.0 liters of blood per minute at rest. Also, at rest, blood flow to the kidneys is approximately 1200 ml/minute. What would the blood flow to the kidneys be if the heart increase its output to 6.5 L/minute (assume a proportional increase in kidney blood flow)? Calculate the mean of each of the following groups of numbers. Do not forget to determine the number of significant digits in the means.

Solution

Ans. C. Given,

            Increase in cardiac output is proportional to increase in renal blood flow rate.

Now,  

Cardiac output of 5.0 L/min is equivalent to renal flow rate of 1200 mL/ min

Or, Cardiac output of 1.0 L /min - -           -           -           -           (1200/ 5) mL/ min

Or, Cardiac output of 6.5 .0 L /min -          -           -           - [(1200/ 5L) x 6.5L] mL/ min

                                                                                                = 1560 mL/ min

Therefore, new renal blood flow rate is equal to 1560 mL/ min.

Ans. 8. There is no data available. A hypothetical example is mentioned.

Q. Calculate mean of : 5, 6, 8, 6, 7,6, 3, 6

Ans. Mean = sum to number in the data set / total count (n) of values of data in set

            Here, n = 8

            Or, mean = ( 5 + 6 + 8 + 6 + 7 + 6 + 3 + 6) / (8)

                                    = 47/8

                                    = 5.875

Hence, mean of the data = 5.875

Number of significant digits = 4

Rules for counting significant figure:

1. Non-zero digits are always significant.

2. Any zeros between two significant digits are significant.

3. A final zero or trailing zeros in the decimal portion ONLY are significant.