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When you go outside on a hot summer day, your body temperature heats up above the normal range. Receptors in your brain detect the change in body temperature. The brain activates nerve cells that send messages to sweat glands, causing the body temperature to fall as the sweat evaporates from the skin. What part of this feedback loop is the stimulus?  

Which pigment secreted by specialized cells in the skin is capable of absorbing ultraviolet light and protecting against DNA damage?

If the solute concentration is greater inside of the cell than outside the cell, water will move by osmosis  

Epithelial linings do not have blood vessels, nutrients reach them by diffusion from:  

Surface tension of an water is generated by the presence of _____ between water molecules.    

Which type of chemical bond involves the sharing of valence electron pairs between two atoms?  

 Dense elastic connective tissue forms

Which type of chemical reaction will absorb more energy than it releases?    

The buildup of bilirubin in the blood causes yellowish discoloration of the skin, This condition is  

A group of cells that work together to perform a particular function is a(n)