A 50-year-old woman was concerned about the appearance of "crow's-feet" by her eyes. She was told by her physician that these wrinkles were caused by years of squinting and blinking using which muscle?

a. frontal belly of occipitofrontalis
b. orbicularis oculi
c. risorius
d. orbicularis oris


b. orbicularis oculi

Anatomy & Physiology

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Lungs are to the respiratory system as the spleen is to the

A) lymphatic system. B) urinary system. C) digestive system. D) cardiovascular system. E) muscular system.

Anatomy & Physiology

Stimulus for the secretion of parathyroid hormone is a decrease in serum ________ levels.

A. phosphate B. Ca2+ C. calcitonin D. K+ E. Na+

Anatomy & Physiology

The pseudostratified columnar epithelium of the bronchi in smokers may transform into stratified squamous epithelium. This is an example of __________.

A. neoplasia B. metaplasia C. atrophy D. differentiation E. hyperplasia

Anatomy & Physiology

Under normal circumstances, the wrist can be hyperextended, but the elbow cannot.

Answer the following statement true (T) or false (F)

Anatomy & Physiology