Changes in the mouth associated with aging include
A. thinning cementum.
B. shrinking dentin.
C. thinning enamel.
D. overgrowth of gums.
Answer: C
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What is the action of the muscle labeled C?
a) laterally flex and rotate head b) extends head c) depresses tongue d) protracts mandible (as in opening the mouth) e) elevates the mandible (as in closing the mouth)
For a sprint lasting 60 seconds, ATP is supplied primarily by
A. aerobic respiration only. B. phosphate transfer and glycolysis. C. conversion of lactate to pyruvate. D. phosphate transfer only.
Continuous capillaries
A. have many thin areas called fenestrae. B. are freely permeable to large molecules such as hormones. C. have a wall where the endothelial cells fit very tightly together. D. are more permeable then fenestrated capillaries but not as permeable as sinusoidal capillaries. E. are characterized by continuous pores.
Which is a change in bone architecture or mass related to aging?
A. Insufficient calcification B. Demineralization C. Reduction in the organic content of the matrix D. Loss of flexibility and increase in brittleness E. All of the choices are correct.