Absorption of O2 from blood and release of CO2 from tissue cells is known as
A) external respiration.
B) internal respiration.
C) pulmonary ventilation.
D) gas diffusion.
E) alveolar ventilation.
Answer: B
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Movement of hair cells in the semicircular canals signals
A. the direction of motion. B. the velocity of the movement. C. the frequency of the sound. D. sound waves to the brain.
Blood vessels, in correct order from the largest to the smallest, are:
(1) capillaries (2) aorta (3) elastic arteries (4) arterioles (5) muscular arteries A) 1, 2, 3, 4, 5 B) 5, 4, 3, 2, 1 C) 5, 3, 2 or 4, 1 D) 1, 3, 5, 2 or 1 E) 2, 5, 3, 4, 1
The reason for the reddish tint seen in lightly pigmented skin is the molecule formed by the combination of oxygen and melanin.
Answer the following statement true (T) or false (F)
What do thyroid follicular calls secrete?
a) calcitonin b) parathyroid hormone c) thymosin d) thyroxine