Which of the following describes the action of the corrugator supercilii?
A) depresses the lips
B) purses the lips
C) wrinkles the brow
D) elevates the mandible
E) moves the external ear
Answer: C
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At the normal resting membrane potential of a typical neuron, its sodium-potassium exchange pump transports
A) 1 intracellular sodium ion for 2 extracellular potassium ions. B) 2 intracellular sodium ions for 1 extracellular potassium ion. C) 3 intracellular sodium ions for 1 extracellular potassium ion. D) 3 intracellular sodium ions for 2 extracellular potassium ions. E) 3 extracellular sodium ions for 2 intracellular potassium ions.
What is the primary site of erythropoiesis in the adult?
a. heart b. kidney c. bone marrow d. liver
The study of the structure of an organism and the relationship of its parts
The tubercle found on the neck of a rib articulates with a facet found on the
a) spinous process of a thoracic vertebra. b) spinous process of a lumbar vertebra. c) transverse process of a thoracic vertebra. d) xiphoid process of the sternum. e) manubrium of the sternum.