____, also called liver spots, age spots, or sun spots, are so-called because of their liver-like color.

________ is (are) long, whip-like extensions of the cytoplasm

a. Cilia b. Flagella c. Cellulose d. DNA

Nitroglycerine is a medication commonly prescribed to patients with angina pectoris. Nitroglycerine helps relieve cardiac chest pain because it:

A) constricts the blood vessels, reducing the workload of the heart. B) constricts the blood vessels, increasing blood pressure. C) dilates the blood vessels and increases the workload of the heart. D) dilates the blood vessels and reduces the workload of the heart.