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Hi Walter!

I am in grade 10 and was just wondering about two questions. I have tried to search the answers online but have not found a clear answer. Firstly, how many times does a person blink in a day? As well as what does a blood vessel, bladder, and airway have in common?

thank you

Hi tanya
There are a lot of factors here to consider because it depends upon how long they are awake and some eyes are more sensitive.  A person blinks 10 to 30 times per minute on the average. I will leave the math to you for the blinks per day

As to your other question all of these are lined with smooth contractile muscle  


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Walter Hintz


Science teacher for over 50 years. MSc. in biology. I can answer questions in general biology, zoology, botany, anatomy and physiology and biochemistry.


I have a MSc in biology and have been a science teacher for over 50 years. At present I am a faculty member at a college and a science consultant at seven catholic schools.

The Ohio journal of Science
Momentum-The Journal of the Catholic Education Association

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