Blood is pumped away from the heart at high pressure in arteries, and returns to the heart at low pressure in veins. The human circulatory system is a double circulatory system.
How are human red blood cells adapted to their function?
They are red.
They have a biconvex shape.
They have no nucleus.
Which of these is a function of the blood plasma?
To transport oxygen.
To transport digested food.
To produce platelets.
What type of cell are phagocytes?
Red blood cells.
White blood cells.
Which type of blood vessel has a ‘pulse’?
Which type of blood vessel has valves inside?
Which type of blood vessel carries blood away from the heart?
What type of circulatory system do humans have?
An open circulatory system.
A single circulatory system.
A double circulatory system.
From which chamber of the heart does blood leave to go to the lungs?
Which ventricular wall is thickest?
Both are equal.
Which blood vessel leaves the lung?