In humans, oxygen is delivered from the environment to the cells of the body by ________.
A) a closed circulatory system
B) an open circulatory system
C) diffusion
D) diffusion and facilitated diffusion
Correct Answer:
Verified
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
Q15: The basic rhythm of the heartbeat is
Q16: If your blood pressure were 120/70, it
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
Q21: Leukemia _.
A)decreases the production of white blood
Q22: In the human respiratory system, gas exchange
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