Physio Mastering A&P Ch. 3

A double membrane droplet containing proteins along the center and an aqueous core

Liposomes

Functions of the cell membrane include physical isolation of the cell from its surroundings, regulation of exchange, structural support, and which other function? Extracting energy from the environment for cell survival Radiation of heat to prevent protein denaturation and cell stress. Communication between the cell and its environment Binding and delivery of oxygen

Communication between the cell and its environment

Define interstitial fluid, indicating whether it is inside or outside cells (intracellular or extracellular). Interstitial fluid is the intracellular fluid of the blood cells. Interstitial fluid is the intracellular fluid found in all cell types. Interstitial fluid is the extracellular fluid inside the circulatory system. Interstitial fluid is extracellular fluid outside the circulatory system and the cells.

Interstitial fluid is extracellular fluid outside the circulatory system and the cells.

Droplets of phospholipids containing a lipid core/center

Micelles

If you were to throw many phospholipids into an aqueous solution, which of the following would you observe? Phosphate heads and lipid tails would orient away from each other, with the phosphate heads facing either the extracellular or intracellular fluid and the tails facing each other. Lipid tails would orient toward the extracellular and intracellular fluids . Phosphate heads and lipid tails would orient with each other, both facing the extracellular and intracellular fluid. Phosphate heads would orient away from the extracellular and intracellular fluids.

Phosphate heads and lipid tails would orient away from each other, with the phosphate heads facing either the extracellular or intracellular fluid and the tails facing each other.

Cell membrane properties vary considerably in different types of cells. What determines the specific properties of a cell membrane? The thickness of the membrane The relative amounts of proteins and lipids The amount of carbohydrate in the membrane The amount of cholesterol in the membrane

The relative amounts of proteins and lipids

Two rows of phospholipids that form a sheet with tails facing each other and heads on either side facing the aqueous solution

bilayer

Which tissue would likely have cells with the greatest number of gap junctions? cardiac muscle bone the mucosal layer of the GI tract epidermis

cardiac muscle

Which of the following phrases best defines something that is hydrophobic? A substance that _______. does not mix with water attracts to water is polar does not mix with lipids

does not mix with water

Where would ciliated epithelial be found? in the trachea in medium-sized veins in the kidneys in the GI tra

in the trachea

The more metabolically active a membrane is, the more __________ it contains. protein nucleic acid carbohydrate lipid

protein

The cell membrane is made up of many different kinds of proteins. These proteins can be classified as either peripheral, transmembrane, or lipid-anchored proteins. Regardless of their classification, these proteins all play an important role in the function and integrity of a cell. Which of the following properly describes the function of membrane proteins? to provide a selective barrier to combine with lipids to form strong shells that prevent the movement of substances across the membrane to combine with a carbohydrate, providing an immune response and/or cell recognition to provide structural stability for the cell to provide fluidity to the membrane to allow for cell-cell communication to serve as a channel for the transport of molecules between extracellular and intracellular fluid

to combine with a carbohydrate, providing an immune response and/or cell recognition to provide structural stability for the cell to allow for cell-cell communication to serve as a channel for the transport of molecules between extracellular and intracellular fluid