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.
b
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During platelet plug formation, platelets begin to stick to
A. collagen with the assistance of von Willebrand factor. B. collagen with the assistance of prothrombin. C. prostacyclin with the assistance of activated factor V. D. prostacyclin with the assistance of thromboxane A2. E. proconvertin with the assistance of factor IX.
The systemic circulation
a. receives more blood than the pulmonary circulation does b. receives blood from the left ventricle c. is a low pressure system compared to the pulmonary circulation d. has characteristics a and b e. has characteristics b and c
Alexander has been diagnosed with a pituitary tumor, which means the tumor is in the ________.
A. foramen magnum B. sella turcica C. crista galli D. cribriform plate E. pterygoid canal
Which of the following bony landmarks form an articulation?
A. Occipital condyles with the atlas B. Occipital condyles with the axis C. Mandibular fossa with the coronoid notch D. Mandibular fossa with the coronoid process