Which cranial nerve releases a neurotransmitter that can decrease the heart rate?
A. Abducens
B. Vagus
C. Hypoglossal
D. Trochlear
Answer: B
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The primary goal of the immune response is
A. destruction or inactivation of pathogens and foreign material. B. maintenance of the proper ionic balance between lymph and blood. C. stimulation of mitotic activity in order to replace cells damaged by infection. D. reduction of the number of circulating memory lymphocytes. E. removal of antibodies from lymph and lymphatic organs.
Which of the following statements concerning receptors is correct?
a. the larger the receptor potential, the greater the frequency of action potentials initiated in the afferent neuron. b. tonic receptors often exhibit an "off-response." c. phasic receptors are important in situations where maintained information about a stimulus is valuable. d. receptor adaptation results from nerve fatigue. e. receptors are part of efferent neurons.
Which type of blood is considered to be the universal recipient?
A) Type AB B) Type A C) Type B D) Type O
Ionic bonds are formed when
A) atoms share electrons. B) electrons are completely transferred from one atom to another. C) a pair of electrons is shared unequally by two atoms. D) hydrogen forms bonds with negatively charged atoms. E) two or more atoms lose electrons at the same time.