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.

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

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Y
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1# # Z E I T G E B E R # # # # # # # # #
2# # # # # # # # # # T # # # # # # # # #
3# # # # # # # # # W # # # # # # # # # #
4# # # S I F F R E X O G E N O U S T # #
5# # # C U # # N # E # # # # # # # H # #
6L A E N I P T # # V # # # # # # # G E #
7# # # # # Y R # # A # # # # # # # I Y #
8# # # # F # # A R C T I C C I R C L E #
9# # # I # # # S C I R C A N N U A L N #
10# # V N # # # I U H # T # # O # # # D #
11M E # F # # R # # M I # A # # I # # O #
12E U # R # C # # # # A A # H # # S # G #
13L L # A A # # Y P E E L S # C # # E E #
14A T # D # # # # # # # # A M # O # # N #
15T R I I # # S R E T S M A H A # H # O #
16O A # A E R U T A R E P M E T T # C U #
17N D # N # # # # L A C I G O L O I B S #
18I I # # # # # # # # # # # # # # P C # #
19N A # # # # # # # # # # # # # # # Y # #
20# N # # # L A U R T S N E M # # # # H #
Word X Y Direction
ARCTICCIRCLE  88e
BIOLOGICAL  1717w
CAVE  108n
CIRCADIAN  99sw
CIRCANNUAL  99e
ENDOGENOUS  198s
EXOGENOUS  94e
EYE  198n
HAMSTERS  1415w
HYPOTHALAMUS  1920nw
INFRADIAN  49s
LIGHT  188n
MELATONIN  111s
MENSTRUAL  1420w
NOISE  149se
PINEAL  66w
SCHOCHAT  1917nw
SCHOCHAT  1917nw
SCN  44s
SIFFRE  44e
SLEEP  1313w
SLEEPY  1313w
SUPRACHIASMATIC  1111se
TEMPERATURE  1516w
TWENTYFIVE  112sw
ULTRADIAN  212s
ZEITGEBER  41e