NAME: 1. Match each of the definitions in Column A with the appropriate term in Column B. Column A Column B __D__ term that refers to a membrane potential of about -70 mv __F__ reversal of membrane potential due to influx of sodium ions __B__ major cation found outside of a cell __A__ minimal stimulus needed to elicit an action potential __E__ period when cell membrane is totally insensitive to additional stimuli‚ regardless of the stimulus force applied __C__ major cation found inside
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irritability‚ conductivity‚ resting membrane potential‚ polarized‚ sodium-potassium pump‚ threshold stimulus‚ depolarization‚ action potential‚ repolarization‚ hyperpolarization‚ absolute refractory period‚ relative refractory period‚ nerve impulse‚ compound nerve action potential‚ and conduction velocity. 2. To list at least four different stimuli capable of generating an action potential. 3. To list at least two agents capable of inhibiting an action potential. 4. To describe the relationship between
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is a need to follow protocol: Clients have the right to refuse to take a medication. Determine the reason for refusal‚ provide information regarding the risk of refusal‚ and notify the appropriate health care personnel‚ and document refusal and actions taken. Health Promotion and Maintenance 1. Briefly explain Lactation/Pregnancy Risk Categories Category A: Controlled studies in pregnant women fail to demonstrate a risk to the fetus in the first trimester with no evidence of risk in later trimesters
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Neurons don’t travel‚ the impulses they transmit do. As a simple analogy‚ a neuron is like an electric cord: it stays still but an electric current flows through it. In the same way‚ a neuron stays still and electrical potentials (graded potentials and an action potential) move along its membrane fr... 4. What part of the neuron receives information? The function of the dendrites is to receive informat 5. How large are neurons? Neurons range from about
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neuron via the leak channels. 2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your prediction? Your answer: By increasing the extracellular K+ the membrane potential will change to be a less negative value. By adding more extracellular K+ the intracellular K+ will decrease and cause the membrane potential to become less negative. This result in a increased postitve membrane was what we predicted during
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(Martini‚ 376). A Myelin sheath can be found in both nerves and neurons (Martini‚ 383). Myelin is an electrical insulation on the axon that increases the speed at which action potential travels
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blocks action potential production at the site of injection. How do you think Novocain works on the axon membrane‚ and how does it block the sensation of pain? Novocain serves to block receptors on nerve cells that sense pain. Therefore preventing neurotransmitter from binding to the receptors and stimulating sensory neurons to fire. More specifically Novocain blocks the sodium channel and prevents depolarization from occurring in the neurons of the site of injection. Because of this an action potential
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transmission of action potentials from one neuron to another. A chemical called acetylcholine is the neurotransmitter released from the presynaptic neuron. As the postsynaptic cells on the muscle cell membrane receive the acetylcholine‚ the channels for the cations sodium and potassium are opened. These cations produce a net depolarization of the cell membrane and this electrical signal travels along the muscle fibers. Through the movement of calcium ions‚ the muscle action potential is taken into
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threshold that has to be reached for action potential to be detected. For example‚ if resting membrane potential of a neuron is -70 mV and sodium ions are added it would cause the voltage to drift toward -55mV because the equilibrium potential for sodium is +60 mV. However‚ a few sodium ions would not cause the voltage to change. An extensive amount of sodium ions has to be added to the dendrite of a neuron to drop the voltage to -55 mV. When the membrane potential shifts from -70 mV towards -55 mV
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singal integration‚ it consists of the axon hillock. The signals transmitted from the first zone is integrated in this region. If the signal is strong enough‚ an action potential would be initiated. Third zone is specialized for signal conduction‚ it consists of the axon. The axon carries the information‚ usually from action potentials‚ from the cell body to the axon terminal. The fourth zone of a neuron is for signal transmission to target cells‚ it consists of the axon terminals. These axon terminals
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