★ Respiration, Immune System, Blood Cells Quiz
Give one adaptation of alveoli for efficient gas exchange.
A. Alveoli have a one cell thick lining for a short diffusion pathway.
B. Alveoli have a small surface area for fast diffusion of oxygen.
C. Alveoli have many a thick lining for a long diffusion pathway.
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Name 2 human excretory organs.
A. Heart and lungs
B. Brain and heart
C. Kidneys and lungs
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