Cycle is a time interval in which a regularly repeated sequence of events takes place.
anovulatory c. A sexual cycle in which no ovum is produced.
brainwave c. The complete series of changes in amplitude of a wave of the electroencephalogram before repetition occurs.
carbon c., carbon dioxide c. The natural processes through which carbon in the atmosphere, in the form of carbon dioxide, is converted into carbohydrates by photosynthesis, metabolized by living organisms, and ultimately returned to the atmosphere, again as carbon dioxide.
cardiac c. The complete round of events that occur in the heart with each heartbeat.
exogenous c. The phase in the development of a parasite spent in the body of the invertebrate host, as of the malarial parasite in the body of a mosquito.
Krebs c. See tricarboxylic acid cycle.
life c. The entire life of an organism.
menstrual c. The sequence of normal changes taking place in the endometrium, culminating with shedding of uterine mucosa and bleeding ; they correspond to changes in the ovary and occur in response to hormonal activity. In popular usage, the term encompasses all ovarian and uterine changes.
nitrogen c. The continuous process in which nitrogen is deposited in the soil, assimilated by bacteria and plants transferred to animals, and returned to the soil.
ovarian c. The recurrent sequence of events taking place in the ovary, including maturation and release of the ovum, in response to hormonal activity.
reproductive c. The series of physiologic changes that take place in the female
reproductive organs from conception to delivery.
tricarboxylic acid c. A series of enzymatic reactions involving the complete oxidation
of acetyl units, providing the main source of energy in the mammalian body and taking place mostly during respiration.
urea c. The series of chemical reactions that occur in the liver, resulting in the production of urea.