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3 years ago

Explain the method of passive transport that moves molecules across the plasma membrane of a cell

2 answers:

8 0

Simple diffusion occurs across a permeable membrane, meaning all of the molecules, such as water, oxygen, or carbon dioxide, diffuse through without the help of transport proteins. Osmosis occurs over a selectively permeable membrane. The membrane is selectively permeable to water molecules more than to the solute molecules in solution with the water.

ElenaW [278]3 years ago

7 0

Passive transport is a movement ofbiochemicals and other atomic or molecularsubstances across cell membranes without need of energy input. Unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy. The rate of passive transport depends on thepermeability of the cell membrane, which, in turn, depends on the organization and characteristics of the membrane lipids andproteins. The four main kinds of passive transport are simple diffusion, facilitated diffusion, filtration and osmosis.

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In response to a stimulus, the membrane slowly depolarizes until the membrane potential reaches a particular value, called thres

Leni [432]

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The Question is incomplete. Here should be the complete question.

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Initiating an action potential

Under most circumstances, once an axon's membrane potential reaches threshold (about -55 mV in mammals), an action potential is automatically triggered. The graph below shows the changes in membrane potential that occur in an axon membrane that is initially at resting potential.

In response to a stimulus, the membrane slowly depolarizes until the membrane potential reaches a particular value, called threshold. At threshold, a rapid depolarization of the membrane occurs and an action potential is initiated.

Drag the labels onto the flowchart to show the sequence of events that occurs once

the membrane potential

-1. membrane potential reaches threshold

-2. Na+ ions rush into the cell

-3. membrane potential rises (depolarizes) rapidly

-4. many Na+ voltage-gated channels open

The ANSWER WILL SURELY BE

membrane potential reaches threshold ---> many Na+ voltage-gated channels open ---> Na+ ions rush into the cell ---> membrane potential rises (depolarizes) rapidly

(1--->4--->2--->3)

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3 years ago