Any gland of the body that secretes a substance or hormone, thereby controlling certain bodily processes.
The expansion and contraction of an artery associated with each heartbeat.
The science that deals with the function of a plant or animal's body and its organs, systems, tissues, and cells.
One of the upper chambers of the heart.
System pertaining to the kidneys and filtration.
One of the subdivisions of the lungs; smaller than bronchial tubes, bigger than alveoli.
Operates the voluntary motor activity of the body.
The oxidation of organic compounds that occurs within cells, producing energy for cellular processes.
The brain and spinal cord in vertebrate, which receive sensory impulses and from which motor impulses issue.
The part of the autonomic system that stimulates organs for flight or fight.
The tendency of a system to maintain internal stability.
Small endocrine glands located in the lower part of the brain that secretes hormones into the bloodstream to influence growth and stimulate organs and glands.
Extremely narrow, microscopic blood vessel. The presence of blood in capillaries produces the pink color of skin.
The number of times an organism breathes in a minute.
The filtering and excretory unit of the kidney, consisting of the glomerulus and tubules.
An important pressure equalizer for the body.;The layer or sheet of muscle and connective tissue that forms the wall between the thoracic and abdominal cavities of mammals and aids in the process of breathing.
The process that allows molecules to move across a membrane in an effort to equal concentration.
One of a pair of organs in the back of the abdominal cavity that form and excrete urine, regulate fluid and electrolytes, and act as endocrine glands.