Biological Rhythms: the sleep-waking cycle

ARCTICCIRCLE
BIOLOGICAL
CAVE
CIRCADIAN
CIRCANNUAL
ENDOGENOUS
EXOGENOUS
EYE
HAMSTERS
HYPOTHALAMUS
INFRADIAN
LIGHT
MELATONIN
MENSTRUAL
NOISE
PINEAL
SCHOCHAT
SCHOCHAT
SCN
SIFFRE
SLEEP
SLEEPY
SUPRACHIASMATIC
TEMPERATURE
TWENTYFIVE
ULTRADIAN
ZEITGEBER

See how much you remember about biological rhythms and the sleep-waking cycle with this wordsearch. Answer the questions first then look for the missing word in the grid below.

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S M P E M R E S Q R M I B E Y L U L Z C
F W A J L T Y Z R N I N O T A L E M J E
O W O B C L E V I F Y T N E W T W G P E
Z N C S D S U O N E G O X E D N M T E Y
A P O R U L T R A D I A N C I X F H T W
L A E N I P Q H A L T Z O F Q V X G E Y
B X V R S Y R M S S F B B Y L D S I Y P
P P F F K V S A R C T I C C I R C L E K
N A I D A C R I C I R C A N N U A L N H
U E S R E T S M A H V K Y H O Y N Q D Y
Y I L A C I G O L O I B M X N I E M O P
Y S E F L H F I G Q T A V S H U S V G O
K P E I K T A H C O H C S I F F R E E T
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W O R U Y E R U T A R E P M E T X B U L
O B K Q W X F X N A I D A R F N I V S A
U P M O J X O O E R K W U Z E V A C F M
B B S J Z B W I S T A E V X F D F K I U
B P A X K W K R E B E G T I E Z C W X S
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Answer Key for Biological Rhythms: the sleep-waking cycle

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2# # # # # # # # # N I N O T A L E M # #
3# # # # # # E V I F Y T N E W T # # # #
4# N C S # S U O N E G O X E # # # T # #
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9N A I D A C R I C I R C A N N U A L N H
10# # S R E T S M A H # # # # O # # # D Y
11# # L A C I G O L O I B # # # I # # O P
12# # E # # # # # # # # A # # # # S # G O
13# # E # # T A H C O H C S I F F R E E T
14# # P # # L A U R T S N E M # # # # N H
15# # Y # # # # # # # # # # # A # # # O A
16# # # # # E R U T A R E P M E T # # U L
17# # # # # # # # N A I D A R F N I # S A
18# # # # # # # # # # # # # # E V A C # M
19# # # # # # # # # # # # # # # # # # # U
20# # # # # # # R E B E G T I E Z # # # S
Word X Y Direction
ARCTICCIRCLE  88e
BIOLOGICAL  1111w
CAVE  1818w
CIRCADIAN  99w
CIRCANNUAL  99e
ENDOGENOUS  198s
EXOGENOUS  144w
EYE  198n
HAMSTERS  1010w
HYPOTHALAMUS  209s
INFRADIAN  1717w
LIGHT  188n
MELATONIN  182w
MENSTRUAL  1414w
NOISE  149se
PINEAL  66w
SCHOCHAT  1313w
SCHOCHAT  1313w
SCN  44w
SIFFRE  1313e
SLEEP  310s
SLEEPY  310s
SUPRACHIASMATIC  1111se
TEMPERATURE  1616w
TWENTYFIVE  163w
ULTRADIAN  55e
ZEITGEBER  1520w