The sphenoid bone is sometimes referred to as a "key stone" of the skull. This is due to the fact that ________
A) the sphenoid is wedged in the superior most portion of the skull and supports all of the other bones below (excluding the mandible)
B) the intricate shape of the sphenoid makes it critical to the district characteristics of the individual human face
C) the sphenoid is in the center of the skull and it articulates (joins) with all of the other bones of the skull (excluding the mandible)
D) the sphenoid bone is solid like a stone and provides the strength necessary to support the skull
C
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Flexing of the knee will allow one to palpate the hamstring muscle tendons along the anterior aspect of the knee joint.
Answer the following statement true (T) or false (F)
The coccygeal plexus innervates _____.
a. the skin of the thigh b. the dorsal skin of the feet c. the muscles of the pelvic floor d. the intrinsic muscles of the feet
The amount of air exchanged during normal quiet breathing is about ________
A) 500 mL B) 1200 mL C) 2100 mL D) 4800 mL E) 6000 mL
Vitamin A plays a critical role in night vision because:
A. it is required for the synthesis of the retinal portion of rhodopsin. B. it is transformed into the opsins found in cone cells. C. it acts a coenzyme in the reaction that degrades cGMP within rod cells. D. it catalyzes the mitotic generation of light-reflecting epithelial cells, which support widely dispersed rod receptors. E. it is a key intermediate in the signal transduction pathway within cone cells that is activated by light.