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2A-B Worksheet for Exam 2 preparation 2A- 1 Neuroglia that control the chemical (extracellular) environment around neurons by buffering potassium, form the “blood brain barrier” and recapture neurotransmitters are__________________. 2A-1 Ciliated CNS neuroglia that line ventricles of the brain and central canals of the spinal cord and that play an active role in moving cerebrospinal fluid are ______________________________. 2A-2 _____________would be expected to be in high concentration in the cytoplasm of a resting neuron and __________&___________ would be expected to be in low concentrations in the cytoplasm of a resting neuron. 2A-3 _______________ period of a neuron action potential is characterized by a temporary loss of excitability. 2A-4 ______________conductions describes how an action potential jumps node to node in a myelinated fiber. It is _________. 2A-5 Electrical synapses, a signal is sent from a presynaptic neuron to a postsynaptic neuron via _________ __________________. 2A-6 An inhibitory postsynaptic potential (IPSP) is associated with___________________________. 2A-6 When a postsynaptic neuron receives repeated “rapid firing” stimuli in a short time, this is causes__________________. 2A-7 The role of ______________________is to inactivate or destroy ACh shortly after its release by the axonal endings. 2B-8 A neuronal circuit that concentrates or directs a large number of incoming impulses to a rather small number of neurons is called a(n)_________________circuit. 2B-8 If one incoming impulse causes several outgoing nerve impulses, we know that there is a ______________________circuit. 2B-12 Wakefulness results in the activation of the __________________________system. 2B-12 _______________________controls the endocrine system. 2B-13 The ______________ ______________releases oxytocin stimulating the uterine contraction during labor and delivery. 2B-14 ____________ _____________ __________controls circadian rhythm via clock genes influenced by light hitting the retina. 2B- 14 Goal-directed behavior is controlled by the midbrain via _______________________ ________________ and is often affected by abused drugs.
