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

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Y
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1# # # # Y P E E L S I F F R E # # # # #
2# # # # # # # Y L U # # T # # # # # # #
3R E B E G T I E Z M N # A # # # # # # #
4# # # # # # E L L A A # H # E V A C # #
5# # # # # P # C A L I # C # # # I I # #
6# # # # # # # R U A D # O # # T T R # #
7# # H B # # # I N H A # H # A E W C # #
8# # A I # # # C N T R # C M N M E A # #
9# N M O N # # C A O F # S D E P N D # #
10# I S L A # # I C P N A O N # E T I # #
11# N T O I L # T R Y I G S # X R Y A # #
12# O E G D A # C I H E T # O # A F N # #
13# T R I A E # R C N R # G # # T I # # #
14# A S C R N # A O U O E # # # U V # # #
15# L # A T I R U A # N I # # # R E # # #
16# E # L L P S L # O # # S # # E # # # #
17# M # # U I # # U # # # # E # # # # # #
18# N C S # # G S # # # # # # # # # # # #
19# # # # # # # H # # # # # # # # # # # #
20# # # # # # # # T # # # # # # # # # # #
Word X Y Direction
ARCTICCIRCLE  814n
BIOLOGICAL  48s
CAVE  184w
CIRCADIAN  184s
CIRCANNUAL  913n
ENDOGENOUS  167sw
EXOGENOUS  1610sw
EYE  83n
HAMSTERS  37s
HYPOTHALAMUS  1012n
INFRADIAN  1111n
LIGHT  516se
MELATONIN  217n
MENSTRUAL  168sw
NOISE  1013se
PINEAL  616n
SCHOCHAT  139n
SCHOCHAT  139n
SCN  418w
SIFFRE  101e
SLEEP  101sw
SLEEPY  101w
SUPRACHIASMATIC  1111ne
TEMPERATURE  166s
TWENTYFIVE  176s
ULTRADIAN  517n
ZEITGEBER  83w