How many liters of blood normally do have in your body?
a) 3
b) 4
c) 5
d) 9
Your heart is made up of special muscles. What are these muscles called?
a) sphincter
b) smooth
c) elastic
d) cardiac
Which of the following muscles work continuously without getting tired?
a) arm muscles
b) neck muscles
c) cardiac muscles
d) none of these
If you start jumping or running, which cells of your body will need more oxygen?
a) arm muscles
b) neck muscles
c) legs muscles
d) none of these
If you are jumping or running your legs muscles will need more oxygen. How your heart will respond to this challenge?
a) heart beat will becomes slow
b) heart beat will becomes faster
c) heart beat will becomes will remain same
d) heart beat will stop
If you are jumping or running your legs muscles will need more oxygen. What will happen to your breathing rate?
a) it will slow down
b) it will increase
c) it will remain same
d) it will stop
