Exam 1

Which region of the mammalian brain is viewed as the master clock that organizes all circadian rhythms?

What is photoperiodism?

Evidence from hamsters suggests that the activity-rest circadian rhythm can be entrained to any period within

Aschoff's Rule states

All of the following are involved with mammalian photoperiodism except

For a nocturnal animal that is freerunning under constant conditions, the beginning of the active phase (locomotor activity) corresponds approximately to

Which of the following list of biological rhythms is ordered from most frequent to least frequent?

In general, seasonal reproduction in various avian and mammalian species is usually regulated by one of the following factors, but not

What is 'zeitgadachtnis'?

All of the following are involved with mammalian photoperiodism except the

Rodents are most likely to become arrhythmic when exposed to

Which of the following exhibits properties of a master oscillator in birds

A common feature of circadian, circannual, circa tidal, and circa lunar rhythms is that all

Describe two purposes (functions) of biological clocks.

In an early experiment by de Mairan a mimosa plant was placed in a dark cabinet and temperature was held approximately constant. The plant continued to show a daily rhythm of leaf movements, with leaves open during the day and folded at night. This result indicates most conclusively that

The term 'temperature compensation' is most clearly illustrated by the observation that

Briefly describe and evaluate experimental evidence that the SCN is an important neural clock in animals. Then say what you think the most important next step to understanding SCN function as a neural pacemaker would be. Provide a brief experimental approach.

Biological rhythms observed in constant environmental conditions are said to be ___. If an appropriate ___ is given, the rhythm is said to become entrained.

The critical feature of pineal gland function that causes short-day-induced gonadal regression in rodents is

For a diurnal animal that is free-running under constant conditions, the beginning of the active phase (locomotor activity) corresponds approximately to

A phase response curve best describes

Infradian rhythms refer to rhythms with a period

What is the single-most defining characteristic of a true biological rhythm?

Biological clocks are involved in all of the following events except

If diurnal antelope ground squirrels where SCN-lesioned and returned to their natural habitat, what adaptive consequences would this have?

If free running nocturnal hamsters in constant lighting (LL) conditions are given a light pulse during the end of the subjective day, this will

Differences between individuals of a species with respect to tau

An experiment by de Candolle showed that the rhythmic leaf movements of the mimosa plant continue in constant darkness with a period length that was not exactly 24 hours. This type of observation helped to consist biologists that

As compared to homeostatic processes in animals, biological rhythms seem to be much less dependent on

The amplitude of a cycle refers to

For people on a normal day-night schedule, cortisol concentrations are lowest during ___ and peak during the ___

The last link in the pathway to the pineal gland comes from the

What is a limit-cycle oscillator?

How have past experimenters confirmed that the daily clock is an endogenous timer?

What does the circa in circadian and circa tidal mean?

List 5 characteristics of biological clocks.

If you wanted to estimate the limits of entrainment to LD cycles for a particular species, which of the following would provide helpful information?

Label the fucking diagram.

Bright daylight can influence