Each hemoglobin molecule contains
A) four alpha chains.
B) one alpha and one beta chain.
C) four iron ions.
D) one heme group.
E) two heme groups.
Answer: C
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The superior colliculi receive input from the
A. eyes, skin, cerebrum and inferior colliculi. B. inferior colliculi, pyramids, skin and red nucleus. C. skin, ears, pyramids and cerebellum. D. cerebrum, cerebellum, thalamus and inferior colliculi. E. nose, tongue and inner ear.
The biogenic amine, __________, is important for invertebrates as a neurotransmitter
A) Epinephrine B) Norepinephrine C) Thyroid hormone D) Octopamine Fill in the blank with the correct answer.
The dermis is derived from mesoderm, but prior to the formation of the components of the dermis the mesoderm layer forms a connective tissue layer called ________.
Fill in the blank(s) with the appropriate word(s).
The amount of air that can be expelled from the lungs by maximum exhalation following maximum inhalation is the
A) vital capacity B) total lung capacity C) residual volume D) forced vital capacity