Extremely large, unmyelinated axon found in invertebrates. Has high conduction speeds and is usually involved in panic or escape responses.

The specific behavior of an organism relating to the intake of liquids, especially water.

The developmental process pertaining to the initial formation of the aortic valve from unspecified parts. This process begins with the specific processes that contribute to the appearance of the discrete structure and ends when the structural rudiment is recognizable.

The process in which the structure of the ventriculo bulbo valve is generated and organized.

The process in which the structure of a heart valve is generated and organized.

Any process in which an organism enters and maintains a period of dormancy, similar to hibernation, but that occurs during the summer. It insulates against heat to prevent the harmful effects of the season.

The process in which the structure of the tricuspid valve is generated and organized.

The process in which the structure of the atrioventricular valve is generated and organized.

Any process in which an organism enters and maintains a period of dormancy in which to pass the winter. It is characterized by narcosis and by sharp reduction in body temperature and metabolic activity and by a depression of vital signs.

The process in which the structure of the sinoatrial valve is generated and organized.

The process in which the structure of the pulmonary valve is generated and organized.

The process in which the structure of the mitral valve is generated and organized.

The process in which the structure of the coronary sinus valve is generated and organized.

The process in which the structure of the aortic valve is generated and organized.

All sleep stages in the circadian sleep/wake cycle other than REM sleep. These stages are characterized by a slowing of brain waves and other physiological functions.

A stage in the circadian sleep cycle during which dreams occur and the body undergoes marked changes including rapid eye movement, loss of reflexes, and increased pulse rate and brain activity.

The part of the circadian sleep/wake cycle where the organism is not asleep.

The cycle from wakefulness through an orderly succession of sleep states and stages that occurs on an approximately 24 hour rhythm.

The progression of the valve of the coronary sinus over time, from its formation to the mature structure.

The progression of the pulmonary valve over time, from its formation to the mature structure.