Question

During a lab experiment you decide to inject a drug that doubles the length of a blood vessel. If the blood vessel has a blood flow of 20 mL/sec, which of the following will be the new blood flow?

• 10 mL/sec

• 20 mL/sec

• 15 mL/sec

• 18 mL/sec

• 22 mL/sec

Answer 1

From the question, the initial blood flow through the blood vessel was 20 ml/sec. After the introduction of new drug, the vessel length will be two times the initial length.

By using above equation, "Q is proportional to 1 divided by length or inversely proportional to the length of blood vessel".So when the length of blood vessel doubles the flow rate will become half.

Initial flow rate from the question was 20 ml/sec.So when the length doubles,the flow rate becomes half. That is 10ml/sec.

So the answer here is 10ml/sec.