Why is the blind spot called so?

Why are we getting running nose while crying?

The action potential occurs in response to a threshold stimulus; but not at subthreshold stimuli. What is the name of the principle involved?

Cornea transplant in humans is almost never rejected. State the reason.

Name the meninges.

What is cauda equina? horse tail?

What is Canal of schlemm?

What is fovea centralis?

Name the parts of the organ of equilibrium involved in the following functions.
Changes in the body position.

What is the significance of vitamin A in vision?