Which muscle contracts when one smiles?

A. Frontalis
B. Zygomaticus major
C. Depressor anguli oris
D. Orbicularis oris
E. Buccinator


B. Zygomaticus major

Anatomy & Physiology

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The AV node delays the transmission of action potentials slightly to allow ________.

Fill in the blank(s) with the appropriate word(s).

Anatomy & Physiology

The Z line of the sarcomere is characterized by

a. overlapping thin and thick filaments. b. only thick filaments. c. only thin filaments. d. a very dark coloration. e. none of these answers.

Anatomy & Physiology

Removal of the seminal glands would result in semen

A) that lacked sperm. B) with a higher-than-normal pH. C) with less fructose. D) with no lubricating fluids. E) that lacked androgens.

Anatomy & Physiology

Neurons can conduct messages faster if they have

Anatomy & Physiology