There are three different types of cones, each one sensitive to a different color wavelength of light. These cones are designated
A) red, yellow, and blue.
B) red, blue, and green.
C) red, green, and yellow.
D) yellow, green, and blue.
E) red, yellow, and indigo.
B) red, blue, and green.
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Which structure of the eye contains blood vessels and lymphatic vessels?
A) retina B) fibrous layer C) sclera D) vascular layer E) neural layer
Which statement about reflexes is true?
A. A reflex is involuntary. B. A reflex has a fast response. C. A reflex is a motor response. D. All of these statements are true.
The half-life of a hormone allows one to determine
A. the rate of action of a hormone. B. the rate of hormone secretion. C. the rate at which hormones are eliminated from the body. D. the identity of a hormone. E. the rate of travel through the blood to a target.
Extracellular fluid has a ________.
A. higher Na+ content than intracellular fluid B. higher Mg2+ content than intracellular fluid C. higher K+ content than intracellular fluid D. higher number of large organic molecules than intracellular fluid E. higher protein content than intracellular fluid