The basic rhythm of the heartbeat is set by the ________.
A) systolic pressure
B) EKG
C) sinoatrial node
D) "fight-or-flight" hormone
Correct Answer:
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Q10: Blood pressure is lowest in _.
A)veins
B)capillaries
C)arterioles
D)venules
Q11: One type of electrical defect in the
Q12: Which is a characteristic of open circulatory
Q13: Veins carry _.
A)blood away from the heart
B)oxygen-rich
Q14: What is one way in which the
Q16: If your blood pressure were 120/70, it
Q17: In humans, oxygen is delivered from the
Q18: Animals such as hydras and jellies can
Q19: In animals with a closed circulatory system,
Q20: Which blood vessels have thin, leaky walls?
A)capillaries
B)venules
C)arteries
D)veins
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