PDF chapter test TRY NOW

1Name two layered protective covering of human heart.
 
a. The heart consists of  layers.  
 
b.  is the layer of the heart that contains outer double-walled sac.
 
c. The inner layer of the pericardium is called as .
 
2. What is the shape of RBC in human blood?
 
a. RBCs are formed in the .
 
b. The matured mammalian RBCs are
 
c. They are .
 
3. Why is the colour of the blood red?
 
a. RBCs contain the respiratory pigment , which imparts red colour to the blood.
 
b. Haemoglobin present in the RBCs transports from lungs to tissues.