True flight has arisen in
A) Birds and reptiles.
B) Mammals.
C) Insects.
D) All of the above
Answer: D
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When the ventricular walls contract,
A. the tricuspid valve opens and the mitral valve closes. B. the mitral and tricuspid valves open. C. the mitral valve opens and the tricuspid valve closes. D. the mitral and tricuspid valves close.
Which of the following acts as the earliest form of defense against exogenous pathogens in the list?
A) lymphocytes B) skin C) macrophages D) inflammation
The best view of the popliteal region is seen from the
A. lateral. B. posterior. C. inferior. D. anterior. E. superior.
Impulses carried to the heart by means of fibers that secrete acetylcholine are
a. parasympathetic impulses and the heart rate increases b. parasympathetic impulses and the heart rate decreases c. sympathetic impulses and the heart rate increases d. sympathetic impulses and the heart rate decreases