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The most efficient lungs with respect to oxygen uptake are found in this group of vertebrates.

• Birds

• Fish

• Amphibians

• Mammals

• Reptiles

Air enters human lungs from the mouth by passing through the __.

• Posterior air sacs

• Spiracles

• Nasal cavities

• Trachea

• Esophagus

• the hydrophobic pocket between two α chains

• the iron atom in the center of a heme group

• the surface of a β globin chain

• the surface of an α globin chain

The pancreas does NOT secrete __.

• Lipase

• Bile

• Chymotrypsin

• Amylase

• Bicarbonate

Antagonistic effectors are defined as two positive feedback mechanisms that work in the same direction to maintain homeostasis.

• True

• False