Which of the following occurs in exocrine secretions and functions to attack pathogens before they enter body tissues?
A) IgA
B) IgD
C) IgE
D) IgF
E) IgM
A) IgA
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As seen on a midsagittal magnetic resonance (MR) image, the fourth ventricle is bordered anteriorly by the ____________________ and posteriorly by the anterior cerebellar notch.
Fill in the blank(s) with the appropriate word(s).
Each tooth is held in the alveolar socket by the
A) cement. B) roots. C) periodontal ligament. D) alveolar tendon. E) apical foramen.
Which of the following statements accurately describes the changes in the membrane potential of a photoreceptor cell when light rays strike its photopigments?
a) The photoreceptor cell undergoes rapid depolarization. b) The photoreceptor cell undergoes hyperpolarization. c) A graded potential proportional to the intensity of the light stimulus occurs in the photoreceptor cell. d) No changes in the membrane potential occur. e) The photoreceptor cell creates action potentials at a frequency proportional to the intensity of the light stimulus.
Matching
A) D B) C C) E D) A 6) Efferent vessels. 7) Cortex. 8) Medullary cord. 9) Trabecula. 10) Medulla.