Human Anatomy and Physiology

______ is required for osmosis to occur.

A selectively permeable membrane.

Types of Transport Proteins

Carrier, Channel, and Pumps

The net movement of a substance from high concentration to low is called ______.

Diffusion

Passive processes ______ require the expenditure of cellular energy.

Do not

Diffusion is the movement of a substance ______ its concentration gradient.

Down

_____ is not a function of plasma membrane proteins

Energy Production

Some membrane proteins catalyze (speed up) the rate of metabolic reactions. These proteins are acting as

Enzymes

The rate at which substances diffuse is not constant but is dependent upon which of the following?

Magnitude of the concentration gradient. Temperature

The passive movement of water through a semipermeable membrane is called ______.

Osmosis

______ processes do not require energy to move a substance in or out of the cell.

Passive

The two major categories of membrane transport are ________ transport that requires no energy expenditure and _________ transport.

Passive;Active

Cell membranes can regulate the transport of materials into and out of the cell. Thus, cell membranes are said to be _______ permeable.

Selectively

In general, ______ molecules move across the plasma membrane readily, whereas ______ molecules need special transport systems to move them across the membrane.

Smaller;Larger

Which statements are true regarding peripheral proteins?

They can "float" and move about the phospholipid bi-layer. They are attached loosely to the cell membrane. They may serve as enzymes.

Which of the following statements are true regarding integral proteins?

They can act as membrane channels. They can act as receptors.

Which of the following statements are true regarding integral proteins?

They can act as receptors. They act as identity markers for the cell. They can act as membrane channels.

______ proteins provide a means of regulating the movement of substances across the plasma membrane.

Transport

Channels, carriers, pumps, symporters, and antiporters are all examples ______.

Transport Proteins

Proteins that assist the movement of a substance across the cell membrane are called ______.

Transport Proteins

True or false: Integral proteins extend through the plasma membrane while peripheral proteins do not.

True

True or false: Water molecules can pass through the phospholipid bilayer if aquaporins are present.

True

Osmosis is unique as it involves the movement of __________ and does not involve the movement of ____________.

Water;Solutes

A difference in solute concentration can exist between the cytosol and the interstitial fluid because the ______ prevents their movement.

phospholipid bilayer