Which type of anesthesiology is also known as a nerve block?

Dobutamine is useful in congestive heart failure because:

a. It causes less increase in heart rate than other sympathomimetics b. It is less expensive than dopamine c. It may be given as a single-dose bolus d. Other medications are ineffective at increasing cardiac contractility

Visual receptors are located on the:

a. Retina b. Iris c. Pupil d. Sclera