(Quiz) Movement through the Cell Membrane

The membrane helps ______ the flow of materials in and out of the cell

block

regulate

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The condition of constant internal environment is referred to as chemical homeostasis

True

False

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Movement of molecules in and out of the cell

When the movement of molecules occurs on its own, without any organized energy input from the cell, the movement is termed (1) transparent . When the cell expends energy to move molecules from one location to another, the process is known as (2)

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active transport

passive transport

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Diffusion is a type of passive transport where the movement of molecules occur in its own in and out of a cell

True

False

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Movement of particles in diffusion, cell passive transport

In a system where diffusion occurs, a net movement of particles can be observed over time from regions of (1) transparent concentration of that substance to regions of (2) concentration of that substance.

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lower

higher

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From highest concentration to lowest concentration

The particles moving from the area of greater concentration will produce a concentration gradient ranging from the point of highest concentration to the point farthest away, where the lowest concentration occurs

True

False

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Diffusion Illustrated

Arrange diffusion steps

(1)

→

(2)

→

(3)

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A partially or differentially permeable membrane is called a ____________

permeable membrane

semi-permeable membrane

mid-permeable membrane

half-permeable membrane

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An example of passive transport is osmosis, which involves the movement of water through a semipermeable membrane

True

False

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What do you call the pressure exerted by dissolved particles in a solution or a colloid?

Missing

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When the osmotic pressure is equal on both sides

When a semipermeable membrane separates two solutions of pure water, the two sides are at —that is, the osmotic pressure is equal on both sides.

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When the osmotic pressure is the same on both sides of a semipermeable membrane

When the osmotic pressure is the same on both sides of a semipermeable membrane, each solution is said to be isosmotic or .

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Hyperosmotic vs hypoosmotic

When a cell is in a medium with a higher concentration of osmotically active dissolved or colloidal particles, rendering a higher osmotic pressure. In such a situation, water moves across the cell membrane into the medium that is (also called hypertonic) relative to the solution inside the cell.
When a cell is in a medium with a lower concentration of osmotically active dissolved or colloidal particles, and the solution thus has a lower osmotic pressure than that inside the cell, the cell is said to be in a medium that is (or hypotonic) relative to it, so water moves into the cell.

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hyperosmotic

hypoosmotic

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The permeability of different types of plasma membranes varies _________

insignificantly

significantly

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In the cell membrane are ______ molecules that help move certain substances in and out of the cell

carrier

receptor

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One of the two main types of transport

One of the two main types of transport that involve (1) transparent , as opposed to passive, transport is known as (2) . Here, (3) molecules move substances either in or out of a cell in a manner that (4) the rate of diffusion across the membrane. The mechanism involved combines molecules that are to be (5) across the membrane with the carrier molecules in the membrane. In such a manner, molecules are picked up on one side of the membrane and released on the other side.

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carrier

active

increases

moved

facilitated diffusion

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