anatomy test questions!! =[

The junction type that lets neighboring cells exchange small molecules is the
desmosome
hemidesmosome
gap junction
tight junction
zonula adherens

close examination of an organ reveals a lining of several layers of cells. the layers do not contain any blood vessels and one surface of the cells is open to the internal cavity of the organ. the tissue is probably
epithelium
muscle tissue
connective tissue
neural tissue
fat tissue

all of the following are true of epidermal ridges except that they
extend into the dermis
contain increased numbers of free nerve endings
cause ridge patterns of on the surface of the skin
produce patterns that are determined genetically
interconnect with the dermal papillae

if a fair-skinned person is sunburned, why does his or her skin turn red?
the blood flow to the skin increases
the number of red melanocytes in the skin increases
melanocytes increase production of red pigment

PLEASE HELP