Neuronal ________ occurs when axons from numerous preganglionic cells synapse on a single ganglionic cell.
Fill in the blank(s) with the appropriate word(s).
convergence
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Answer the following statements true (T) or false (F)
1. All the structures of the upper respiratory tract are outside the chest cavity. 2. The respiratory membrane and respiratory mucosa are two names for the same structure. 3. The paranasal sinuses drain into the pharynx. 4. The nasal cavities assist in warming and humidifying inspired air. 5. Lacrimal sacs and paranasal sinuses both drain into the same structure.
Which statement regarding the relaxation phase of a muscle twitch is true?
A) The phase begins at stimulation and typically lasts about two milliseconds. B) Muscle tension falls to resting levels. C) The action potential sweeps across the sarcomere during this period. D) Tension rises to a peak. E) Cross-bridges are interacting with active sites on actin filaments throughout this period.
Modifiers that affect heart rate are _______.
A) agonists B) antagonists C) inotropic D) chronotropic
A movement through 360 degrees that combines flexion, extension, abduction, and adduction is called ________.
A. hyperextension B. pronation C. rotation D. supination E. circumduction