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.

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

X
Y
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1S # R # # # # # # # # M E L A T O N I N
2R # E # # # # # # # # # # # # # # # # #
3E # B # # # # # # # # # # # # # # # # #
4T # E # # # # T # # T A H C O H C S C N
5S # G # # # H # N A I D A R T L U I # #
6M # T # E G # # # # L A E N I P # F # #
7A # I Y I # # # # # # # # # R S # F # #
8H # E L C R I C C I T C R A U # # R # #
9# # Z L A U N N A C R I C O # # # E # #
10S U M A L A H T O P Y H N # # # # # # #
11# # N A I D A R F N I E X O G E N O U S
12# # # # # # # # # A G # # # # # # # # #
13# # # Y P E E L S O T W E N T Y F I V E
14# # # # # # # M D # # # # # # # # # # #
15# # # # # # A N O I S E # # # # # # # #
16# # # # # T E M P E R A T U R E # # # #
17# # # B I O L O G I C A L # # # # # # #
18E V A C I R C A D I A N # # # # # # # #
19# # # # # # # # # # # # # # # # # # # #
20# # # M E N S T R U A L # # # # # # # #
Word X Y Direction
ARCTICCIRCLE  148w
BIOLOGICAL  517e
CAVE  418w
CIRCADIAN  418e
CIRCANNUAL  139w
ENDOGENOUS  716ne
EXOGENOUS  1211e
EYE  38ne
HAMSTERS  18n
HYPOTHALAMUS  1210w
INFRADIAN  1111w
LIGHT  48ne
MELATONIN  121e
MENSTRUAL  420e
NOISE  815e
PINEAL  166w
SCHOCHAT  184w
SCHOCHAT  184w
SCN  184e
SIFFRE  184s
SLEEP  913w
SLEEPY  913w
SUPRACHIASMATIC  1111sw
TEMPERATURE  616e
TWENTYFIVE  1113e
ULTRADIAN  175w
ZEITGEBER  38n