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.

Try to find all 27 words on this board.

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

X
Y
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1# # # # # # # # # # # # # # # # # # N #
2# # # # # # # # # # # # # # # # N # I #
3H Y P O T H A L A M U S # # # A # # N #
4A # I S # W # S E # I # # # I # # # O #
5M # N L U # E N U F # # # D # # # # T #
6S # E E L P S N F O # # A # # E # # A #
7T # A E T T R R T # N R # # # R # # L #
8E # L P R # E A # Y F E # # # U # # E #
9R # # U A # # R C N F # G # # T L # M #
10S # A # D # # C I H # I E O # A A N # #
11# L # # I # # T R # I S V # X R C A # #
12R # E # A # # I C T I A # E # E I I # #
13# E # E N # # C A O A # S C N P G D # #
14# # B # P # # C N # # H # M # M O A # #
15# # # E # Y A I N # # # C # A E L C # #
16# # # # G V # R U # # # # O # T O R # #
17# # # # E T # C A # # # # # H # I I # #
18# # # T H G I L L # # # # # # C B C # #
19# # # # # E Y E N D O G E N O U S # # #
20# # # # # # # # Z # # # # # # # # # # #
Word X Y Direction
ARCTICCIRCLE  88s
BIOLOGICAL  1717n
CAVE  814sw
CIRCADIAN  1818n
CIRCANNUAL  99s
ENDOGENOUS  819e
EXOGENOUS  1612nw
EYE  819w
HAMSTERS  13s
HYPOTHALAMUS  13e
INFRADIAN  910ne
LIGHT  818w
MELATONIN  199n
MENSTRUAL  103sw
NOISE  914ne
PINEAL  33s
SCHOCHAT  1719nw
SCHOCHAT  1719nw
SCN  1313e
SIFFRE  123sw
SLEEP  44s
SLEEPY  110se
SUPRACHIASMATIC  1111se
TEMPERATURE  1616n
TWENTYFIVE  53se
ULTRADIAN  55s
ZEITGEBER  819nw