The approximate number of red blood cells in a cubic millimeter of blood is:

a. 50,000
b. 500,000
c. 5,000,000
d. 50,000,000


c. 5,000,000

Anatomy & Physiology

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The first structure to intercept light as it enters the eye is the

a. aqueous humor. b. cornea. c. lens. d. retina. e. vitreous humor.

Anatomy & Physiology

The sodium chloride molecule breaks apart in water. What does "B" represent?

A. Chloride ion B. Sodium ion C. Dissociation D. Water molecule E. Salt crystal

Anatomy & Physiology

Over a lifetime, the brain shrinks by about ________ percent.

A. 10 B. 1 C. 40 D. 5

Anatomy & Physiology

A single neuron may be presynaptic to one group of neurons and postsynaptic to another group of neurons

Indicate whether the statement is true or false

Anatomy & Physiology