Which of the following moves the membrane potential of the postsynaptic neuron closer to threshold?
A) inhibitory postsynaptic potential (IPSP) B) opening of potassium ion channels
C) excitatory postsynaptic potential (EPSP) D) hyperpolarization
Answer: C
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A contractile response of a single muscle fiber to a single muscle impulse is called a:
A. tetanus B. tone C. treppe D. twitch E. paralysis
The nerves projecting inferiorly from the spinal cord are collectively called the
A. terminal finale. B. cauda equina. C. terminus filus. D. caudal terminale. E. caudus finalis.
Which of the following is chemically inert (unreactive)?
A) carbon (atomic number 6) B) oxygen (atomic number 8) C) neon (atomic number 10) D) sodium (atomic number 11)
Describe the sites and actions of the cardioinhibitory and cardioacceleratory centers
A) The cardioacceleratory center in the medulla oblongata activates sympathetic neurons to increase heart rate; the cardioinhibitory center in the medulla oblongata activates parasympathetic neurons that slow heart rate. B) The cardioacceleratory center in the medulla oblongata activates parasympathetic neurons to increase heart rate; the cardioinhibitory center in the medulla oblongata activates sympathetic neurons that slow heart rate. C) The cardioacceleratory center in the medulla oblongata activates sympathetic neurons to slow heart rate; the cardioinhibitory center in the medulla oblongata activates parasympathetic neurons that increase heart rate. D) The cardioacceleratory center in the medulla oblongata activates parasympathetic neurons to slow heart rate; the cardioinhibitory center in the medulla oblongata activates sympathetic neurons that increase heart rate. E) The cardioacceleratory center in the medulla oblongata activates somatic neurons to slow heart rate; the cardioinhibitory center in the medulla oblongata activates somatic neurons that increase heart rate.