Human eye can see objects at different distances with contrasting illuminations. This is due to

The part of the human ear that converts the pressure variations associated with audible sound waves to electrical signals is

Pulse is felt due to the rhythmic contraction and relaxation of the

In the human body, blood flows through a process of double circulation. Which one of the following statements is true in this regard ?

The human eye has a point that lacks photoreceptor cells. This is identified as :

Which one of the following is the correct sequence of organs that occur in the path of urine flow in human body?