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Unit 19: Biology Part 2 Page 9 of 137

Dairy - Milk products.

Dendrite – Part of the neuron that receives nerve impulses

Dermis- The layer of skin directly under the epidermis; made of a tough

connective tissue that contains the protein collagen.

dialysis – artificial kidney function

diaphragm – sheet of muscle that contracts or relaxes to let air into and out
of the lungs.

Diastolic Pressure – Measure of the lowest blood pressure

Diet - The sum of the food and drinks consumed by a person. Especially in
regard to his or her health.

Digestion - Process of breaking down food into nutrients.

Duodenum - The first part of the small intestine; where most chemical
digestion takes place.

Eardrum – Part of the ear that vibrates from sound waves

Elimination - The process in which solid food waste passes out of the body.

Enzymes - A substance—usually a protein—that speeds up chemical
reactions in the body.

Epidermis – Outer layer of skin

Epidermis- The outermost layer of the skin; forms the waterproof, protective
wrap over the body's surface; made up of many layers of epithelial cells.

epiglottis – flap of connective tissue that covers the trachea when eating to
prevent choking

Epithelial tissue- A tissue that is composed of layers of tightly packed cells
that line the surfaces of the body; examples of epithelial tissue include the

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