Total length of blood vessels in human body is

Express the number appearing in the following statements in standard form. a. the human eye blinks an average of 4,200,000 times a year. b. The length of the blood vessels in a human body is 97,000,000 m.

Blood present in human body

Largest blood vessel in body is

The normal level of blood glucose in human body is

Blood in human body is pH of

The smallest blood vessel in the body is :-

(a) How many types of blood vessels are there in the human body ? Name them (b) Why does the heart need valves ?