Read the Wikipedia article on secretions.
http://en.wikipedia.org/wiki/Secretion
Discuss the assessments that must be made prior to testing controls
The lumen is the opening of the tube through which the "stuff" made by the gland exits. Some of that stuff (secretions) has hardened.
Epithelium made up of cells that produce secretions.
Protist cell walls can be made of a variety of materials including cellulose, silica, or chitin. The composition of the cell wall depends on the specific species of protist.
Cancer isn't really a specific cell it is just the inability for some cells to stop reproducing.
Special doorways in the cell membrane are made of proteins called ion channels or transporters. These proteins allow specific ions or molecules to pass through the cell membrane, regulating the movement of substances in and out of the cell.
Semen
Chalk is a form of limestone composed of the skeletons and secretions of small marine organisms.
The voltage of a galvanic cell made with silver and nickel will depend on the specific conditions of the cell, such as the concentrations of the electrolytes and the temperature. Typically, a cell made with silver and nickel could have a voltage range between 0.8 to 1.0 V.
Ordinances for communities are made by city councils. These groups meet to discuss problems specific to communities, and they can pass town-wide resolutions.
Yes. Cell phone covers are made to fit specific cell phone models. Purchasing a cover that's made to fit a different model would be a pure waste of money.
A monoclonal antibody is a highly specific antibody that has been formed in a laboratory setting. It is made up of clones from a hybrid cell made from a fusion of B-cells with a tumor cell.