Which of the cells in the diagram will eventually develop into macrophages?
a) A
b) B
c) C
d) D
e) E
e
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The thymus contains ______ lobes and is located _______
A. 2; anterior to the laryngeal prominence (Adam's apple) B. 2; in the mediastinum C. 4; anterior to the laryngeal prominence (Adam's apple) D. 4; in the mediastinum
During the relative refractory period of an action potential, a larger than normal stimulus is needed to cause another action potential. This is due to the fact that ________
A) the voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane B) the membrane is now impermeable to all ions C) the sodium potassium pump will stop working during relative refractory D) the inactivation gates on voltage gated sodium ion channels are closed
The procedure used to directly examine the trachea and bronchial tree is called
A) laryngectomy. B) tracheostomy. C) bronchoscopy. D) tracheotomy.
Which of the following affect heart rate through the use of a cAMP second-messenger system?
A) norepinephrine B) epinephrine C) acetylcholine D) epinephrine and norepinephrine E) acetylcholine, epinephrine and norepinephrine