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an interval or division of time; the time for the regular recurrence of a phenomenon.
absolute refractory period the part of the refractory period from phase 0 to approximately −60 mV during phase 3; during this time it is impossible for the myocardium to respond with a propagated action potential, even with a strong stimulus. Called also effective refractory period.
blanking period a period of time during and after a pacemaker stimulus when the unstimulated chamber is insensitive to avoid sensing the electronic event in the stimulated chamber.
effective refractory period absolute refractory period.
ejection period the second phase of ventricular systole (0.21 to 0.30 sec), between the opening and closing of the semilunar valves, while the blood is discharged into the aorta and pulmonary artery. Called also sphygmic period.
gestation period see gestation period.
incubation period see incubation period.
isoelectric period the moment in muscular contraction when no deflection of the galvanometer is produced.
latent period a seemingly inactive period, as that between exposure to an infection and the onset of illness (incubation period) or that between the instant of stimulation and the beginning of response (latency, def. 2).
refractory period the period of depolarization and repolarization of the cell membrane after excitation; during the first portion (absolute refractory period), the nerve or muscle fiber cannot respond to a second stimulus, whereas during the relative refractory period it can respond only to a strong stimulus.
relative refractory period the part of the refractory period from approximately −60 mV during phase 3 to the end of phase 3; during this time a depressed response to a strong stimulus is possible.
safe period the period during the menstrual cycle when conception is considered least likely to occur; it comprises approximately the ten days after menstruation begins and the ten days preceding menstruation. See the section on fertility awareness methods, under contraception.
sphygmic period ejection period.
supernormal period in electrocardiography, a period at the end of phase 3 of the action potential during which activation can be initiated with a milder stimulus than is required at maximal repolarization, because at this time the cell is excitable and closer to threshold than at maximal diastolic potential.
vulnerable period that time at the peak of the T wave during which serious arrhythmias are likely to result if a stimulus occurs.
1. the period elapsing between the application of a stimulus and the response, for example, contraction of a muscle;
2. Synonym(s): incubation period (1)
1. The interval between exposure to an infectious organism or a carcinogen and the clinical appearance of disease.
2. The interval between stimulus and response.
the interval between the time of exposure to an injurious dose of radiation and the response.
la·tent pe·ri·od(lā'tĕnt pēr'ē-ŏd)
1. The duration elapsing between the application of a stimulus and the response, e.g., contraction of a muscle.
2. bioterrorism Interval between exposure to a chemical, toxic, or radiologic agent and the first signs or symptoms.
3. Synonym(s): incubation period (1) .
Also called incubation period, the time between infection with a disease-causing agent and the development of disease.
Mentioned in: AIDS
la·tent pe·ri·od(lā'tĕnt pēr'ē-ŏd)
Duration between application of a stimulus and the response, e.g., contraction of a muscle.
a seemingly inactive period, as that between exposure of tissue to an injurious agent and the manifestations of response, or that between the instant of stimulation and the beginning of response. The latent period in virus replication defines the period from adsorption, penetration and uncoating of the virus until the first progeny virus are released from the cell.