What is the complement system?
A. A set of 20 inactive proteins activated by the presence of a pathogen
B. Chemicals released by damaged tissue to cause blood vessels to widen
C. Chemicals released by virally infected cells that encourage the production of antiviral protein
D. Chemicals that raise the body temperature
Answer: A
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Which of the following arteries supply blood to the brain?
A. external carotid arteries B. internal carotid arteries C. vertebral arteries D. Both the internal carotid arteries and the vertebral arteries.
The number of sperm cells in an ejaculate averages
A) about 120 million per milliliter. B) about 20 million per millimeter. C) about 20 million per liter. D) about 20 million per milliliter.
Damage to which of the following would most likely result in cessation of breathing?
A) The pontine respiratory group B) The ventral respiratory group of the medulla C) The stretch receptors in the lungs D) The dorsal respiratory group of the medulla
On the scapula, the acromion is continuous with the ________.
Fill in the blank(s) with the appropriate word(s).