The human circulatory system includes the heart, blood and blood vessels
Arteries carry blood towards the heart.
Why do arteries have a thick, elastic wall?
To prevent the back-flow of blood
To facilitate the transport of blood towards the heart
To allow rapid exchange of materials
To withstand the high pressure in the blood vessel
The valves in the heart prevent the back-flow of blood.
Left ventricle has a thicker wall.
The veins always carries deoxygenated blood.
Which of the following can be found in plasma?(I) Water(II) Glucose (III) Proteins
(I) only
(I) and (II) only
(II) and (III) only
(I)and (III) only
What is chamber A?
Right atrium
Right ventricle
Left atrium
Left ventricle
29.What are the states of the atria and the ventricles when blood is flowing from the atria to the ventricles?
Both of them contract.
The atria contract and the ventricles relax.
Both of them relax.
The atria relax and the ventricles contract.
There are three types of blood vessels. The _____________ allow the blood to move away from the heart.
When the atria ____________, blood flows into them. When they contract, blood is pushed into the _____________.
matching
artery
vein
caplilary
The right ventricle pumps ___________blood into the lungs through an artery.