Where does the exchange of food, oxygen and wastes occur in the human body?
a) in arteries
b) in veins
c) in capillaries
d) in lymph vessels
Why does the blood turn dark red as it circulates through the body?
a) it starts to clot
b) it gets old and dirty while flowing through the body
c) the oxygen in it is replaced with carbon dioxide
d) the farther blood is from the heart, the more dark red it is.
The supply of food, water, oxygen, etc. and removal of wastes from our body is called……
a) respiration
b) transportation
c) migration
d) conversion
Capillaries join to form the larger blood vessels:
a) Arteries
b) Veins
c) Villi
d) none of these
The smallest blood vessels in the body are……….
a) Arteries
b) Veins
c) Villi
d) capillaries
Which of the following is/are the diseases of circulatory system?
a) heart attack
b) blood pressure
c) diabetes, asthma
d) all of these
