Sam,Jon,Kayla

1. It has been several weeks since Goodboy Player has completed a tennis match. After the match he discovers that a blister has formed beneath an old callus on his foot and the callus has fallen off. When he examines the callus he discovers that it appears yellow. Can you explain why?

There is a build up of keratin on the bottom of the foot. Karatin gives skin a yellowish complextion.

2. Pulling on hair can be quite painful, yet cutting hair is not painful. Explain. When pulling your hair, the hair folicle is being pulled out and it disrupts the nerve causing pain. When cutting hair the nerve isnt being disrupted. Only the excess hair sticking out from the epidermis is being cut.

Consider the following statement: dark-skinned children are more susceptible to rickets (insufficient calcium in bones) than fair-skinned children. Defend or refute this statement