A voltage-gated K+ channel that is also a delayed rectifier will
A) Open very quickly in response to changes in membrane potential.
B) Make it very difficult to start an action potential.
C) Delay the start of an action potential.
D) Open slowly, increasing the length of the action potential.
Answer: D
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The light and dark bands of a sarcomere are generated by the overlap of:
a. actin and troponin b. actin and tropomyosin c. actin and myosin d. myosin and troponin e. myosin and tropomyosin
A 50-year-old woman was concerned about the appearance of "crow's-feet" by her eyes. She was told by her physician that these wrinkles were caused by years of squinting and blinking using which muscle?
a. frontal belly of occipitofrontalis b. orbicularis oculi c. risorius d. orbicularis oris
The process by which a less specialized cell matures into a more specialized cell is called ________.
A. differentiation B. maturation C. modification D. specialization
Neurons from the nucleus gracilis
A) relay information directly to the cerebrum. B) decussate before entering the medial lemniscus. C) relay sensory information to the ipsilateral cerebral hemisphere. D) carry both crude and fine touch. E) relay information directly to the cerebrum and carry both crude and fine touch.