Which cells in retina responsible for color vision?

A luxation of a joint means that:

The self excitation center (pace maker) of cardiac muscle is known as:

The X-rays can not pass through the bones because of the presence of:

The most powerful anticoagulant known, which inactivates factors IX, X, XI, and XII and is secreted by mast cells is:

Which humero-chemical factor is most important and highly influence the respiration rate?

If little or no stress is applied to bone, what eventually happens to it?

Which muscle causes the lens to focus on close objects?

Name the cells that make the first line of defense in body against infections

Name the organ that releases erythropoietic factor, which converts the plasma proteins into erythropoietin