Which of the following is one of the steps that ends a contraction?
A) Sarcoplasmic reticulum absorbs sodium ions.
B) Acetylcholine binds to receptors on the sarcolemma.
C) Calcium ions bind to troponin.
D) Acetylcholine is broken down by acetylcholinesterase.
E) An action potential spreads across the entire surface of the muscle fiber.
D) Acetylcholine is broken down by acetylcholinesterase.
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Which statement(s) is (are) true with respect to the giant vent worms (Riftiapachyptila)?
A) These worms have a complete digestive tract. B) Nutrients are derived from atrophosome filled with chemolithotrophic bacteria. C) The worm's hemoglobin transports hydrogen sulfide and oxygen to its symbiont. D) B and C
People afflicted with narcissism tend to exhibit all of the following except
A. High degree of self-importance B. Subtle arrogance C. A desire to be in control of others D. A cynical interpretation of human nature E. Self-promoting behaviors with disregard to criticism
The most inferior portion of the sternum is called the
A) manubrium. B) sternal groove. C) body. D) xiphoid process. E) sternal angle.
Select the structure that houses hair cells
a. basilar membrane. b. endolymph. c. oval window. d. organ of Corti. e. tectorial membrane.