Biology

Biology, 23.07.2019 17:50, 885122bah

In the plasma membrane of neurons, a positive charge is found a- in the membrane b- out of the membrane c-neither inside or outside d-both inside and outside

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Physics, 30.09.2019 18:10, lakeithiat1320

Neurons are the basic units of the nervous system. they contain long tubular structures called axons that propagate electrical signals away from the ends of the neurons. the axon contains a solution of potassium ions k+ and large negative organic ions. the axon membrane prevents the large ions from leaking out, but the smaller k+ ions are able to penetrate the . membrane to some degree. (see (figure 1) .) this leaves an excess negative charge on the inner surface of the axon membrane and an excess of positive charge on the outer surface, resulting in a potential difference across the membrane that prevents further k+ ions from leaking out measurements show that this potential difference is typically about 70 mv . the thickness of the axon membrane itself varies from about 6 to 9 nm , so we'll use an average of 7.5 nm . we can model the membrane as a large sheet having equal and opposite charge densities on its faces. part a find the electric field inside the axon membrane, assuming (not too realistically) that it is filled with air. express your answer in volts per meter using two significant figures. part b which way does the electric field point, into or out of the axon? part c which is at a higher potential, the inside surface or the outside surface of the axon membrane?

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Biology, 18.10.2019 06:10, vavzincakjoey

When neurotransmitter molecules bind to receptors in the plasma membrane of the receiving neurona. ion channels in the plasma membrane of the sending neuron open. b. ion channels in the plasma membrane of the receiving neuron open. c. the receiving neuron becomes more negative inside. d. the receiving neuron becomes more positive inside. e. vesicles in the synaptic terminal fuse to the plasma membrane of the sending neuron.

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Biology, 05.11.2019 01:31, kprincess16r

Which of the following are examples of facilitated diffusion? (select all that apply) a. a chloride ion moves across the plasma membrane from a higher to lower concentration inside the cell. b. a protein binds to glucose to transport it across the plasma membrane. c. a water molecule moves across the plasma membrane. d. channel proteins change shape to allow transport of smaller molecules across the plasma membrane.

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