Question

Please show all work for me to understand, thank you!
Please use a heart rate of 70.0 beats per minute instead of 7.00 beats per minute shown in the problem.

1) (20pts.) Given the average heart rate of a human is 7.00 beats per minute and the average volume flow of blood pumped out by the heart to the body is 70.0mL/beat. a) Determine the average flow rate for blood in units of milliliters per minute (mL/min). A person suffers a severe laceration that allows all the blood that is pumped out by the heart to be lost per beat, determine the time, in units of seconds, it takes for a person to b) lose all the blood from their body (assume the total volume of blood in the human body is 4.80L for parts (b), (c), and (d)) c) lose 20.0% of the total volume of blood in the body (at this point a person suffers hypovolemic shock) d) lose 50.0% of the total volume of blood in the body (at this point the heart will stop pumping, organs begin to shut down, and the person might end up a comatose state given the person is saved due to medical intervention)

Answer 1

a) Average blood flow rate ( in mL/min ) = number of heartbeats per minute X blood pumped in one heart beat

= 70 X 70 = 4900 mL/ min

b) Blood flow rate is 4900 mL/minute as calculated in part (a)

Total bood loss means that 4.8 litres which is 4800 mL

Therefore time taken will be Blood Volume Lost / Blood flow rate = 4800 / 4900 = 0.9795 minute = 58.7755 seconds ( 1 minute = 60 s)

c) 20 percent blood loss = 20/100 * 4800 = 960 mL

Time taken = Blood Lost / Blood flow rate = 960 / 4900 = 0.1959 minute = 11.75 seconds

d) 50 percent loss = 50/100 * 4800 = 2400 mL

time taken = Blood Lost / Blood flow rate = 2400 / 4900 = 0.4897 minute = 29.38 seconds