myelin sheath Which ion channel opens in response to a change in membrane potential and participates in generation and conduction of action potentials? Relative refractory period An exceptionally strong stimulus can trigger a response Repolarization The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability. A single type of channel will open, permitting simultaneous flow of 3.) Ca2+ is known to be sequestered by certain organelles within the terminal, including the endoplasmic reticulum. This results in a huge influx of sodium ions inside the cells which trigger the nerve impulse conduction. An excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle is ________. Why was the decision Roe v. Wade important for feminists? After many generations of random mating, the population goes through one cycle of self-fertilization. This is called the absolute refractory period, and it is followed by a relative refractory period, during which another action potential can be generated, but only by a greater stimulus current than that originally needed. Which is by far the most common neuron type? Due to the high concentration of sodium ions inside the axoplasm, the potassium channels will open. True or False, During depolarization, the inside of the neuron's membrane becomes less negative. The frequencies of the alleles A and a are 0.60.60.6 and 0.40.40.4, respectively, in a particular plant population. A) lowering the threshold for an action potential to occur. 38. conduction velocity, Human Anatomy and Physiology, Books a la Carte Edition. Definition. An action potential can form at these gaps and impulse will jump from node to node by saltatory conduction. A) Subthreshold stimulusB) Temporal summationC) Spatial Free Flashcards about ap chap 11 - StudyStack Which of the following describes the nervous system integrative function? The combined effect of sodium inactivation, which blocks the influx of cations, and potassium activation, which causes the efflux of other cations, is the immediate return of the cell membrane to a polarized state, with the inside negative in relation to the outside. The transmembrane movement of ions is actually carried out by molecular mechanismspecifically, by protein molecules embedded in the lipid layers. C) The synaptic cleft prevents an impulse from being transmitted Calcium ions. Thus, no sodium ions will move inside the membrane. So, for conduction of nerve impulse there are two mechanisms: Continuous nerve impulse conduction occurs in non-myelinated axons. Quiz #11 (Nervous Tissue) Flashcards | Chegg.com Because this hyperpolarization draws the membrane potential farther from the threshold, making it more difficult to generate a nerve impulse, it is called an inhibitory postsynaptic potential (IPSP).
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