small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting.
a large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes and conveying air to and from the lungs; the windpipe.
the roof of the mouth, separating the cavities of the nose and the mouth in vertebrates.
the branch of physiology and medicine concerned with endocrine glands and hormones.
respiratory condition marked by spasms in the bronchi of the lungs, causing difficulty in breathing.
a regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action.
the control of hormone release in response to changes in extracellular fluids, such as the ion concentration in the blood.
the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things.
the colorless fluid part of blood, lymph, or milk, in which corpuscles or fat globules are suspended.
a specific organ on which a hormone, drug, or other substance acts.
a hormone that is released by the glands of the endocrine system.
a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
hormones that have other endocrine glands as their target.
a blood protein produced in response to and counteracting a specific antigen.