Biological rhythms

Question 1

Define rhythm

Answer 1

Function which cycles at regular frequency

Question 2

Define circadian rhythm

Answer 2

Daily rhythmical change in behaviour or physiological process

Question 3

Define infradian rhythm

Answer 3

Rhythm with period longer than period of circadian rhythm

Question 4

Define ultraradian rhythm

Answer 4

Rhythm with period shorter than circadian rhythm

Question 5

What is external synchronisation

Answer 5

Biological clocks are internal physical systems that enable organisms to live in harmony with rhythms of nature
E.g. cycles of day & night or seasons

Question 6

What is internal synchronisation

Answer 6

Rhythms that maintain temporal organisation of endogenous processes

Question 7

What are zeitgebers

Answer 7

Any external clue that entrains internal time keeping system of organisms
E.g. light

Question 8

Where are biological clocks found

Answer 8

Retina, suprachiasmatic nucleus & pineal gland