Inhibitory postsynaptic potentials (IPSPs) are associated with which of the following?
A. No change of the threshold
B. Repolarization of the plasma membrane
C. No change in the membrane potential
D. Depolarization of the plasma membrane
E. Hyperpolarization of the plasma membrane
Answer: E
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What is the significance of the cauda equina?
A) It is the shallow longitudinal groove on the posterior surface of the spinal cord. B) It contains the cell bodies of sensory neurons whose axons carry information to the spinal cord. C) It is made up of extensions of the posterior and anterior roots of spinal segments L2 to S5. It forms as the vertebral column continues to elongate after growth of the spinal cord ceases at about age 4. D) It contains the axons of motor neurons that extend into the periphery to control somatic and visceral effectors. E) It is slender strand of fibrous tissue that extends from the inferior tip of the conus medullaris to the second sacral vertebra. It provides longitudinal support to the spinal cord as a component of the coccygeal ligament.
Delicate unpigmented hairs that cover the fetus in early development are called
A. terminal hairs. B. secondary hairs. C. primary hairs. D. vellus hairs. E. lanugo hairs.
The elasticity of the lens decreases with age. This leads to which of the following?
A) less light getting to the retina and diminished visual acuity B) lowered accommodation of the pupillary reflex and blurry vision C) a clouding of the lenses know as a cataract D) less accommodation of the lenses and difficulty focusing on nearby objects
Which type of cartilage is dense and very resistant to stretching?
a. hyaline cartilage b. costal cartilage c. elastic cartilage d. fibrocartilage