A & P Mastering: CHAPTER 3 AND CHAPTER 4

Which of the following names the three main parts of a human cell? A. cytosol, nucleus, and membrane B. mitochondria, lysosome, and centriole C. plasma membrane, mitochondria and nucleus D. cytoplasm, plasma membrane, and nucleus

Phospholipids provide the specific functions of the plasma membrane. True False

Which of the following describes tight junctions? A. junctions among epithelial cells lining the digestive tract B.cell junctions in areas that are subjected to great mechanical stress, such as the skin and heart muscles C. junctions within electrically excitable tissues, such as the heart and smooth muscle D. junctions where cells are held together by cadherins

Which of the following is the main component of the cell membrane? A. phospholipids B. cholesterol C. carbohydrates D.water

Which of the following is a characteristic of the cell membrane? A. semipermeable B. not permeable C. impermeable D. fully permeable

Which of the following is not a major function of proteins in the cell membrane? A. acting as receptors B. anchoring cells to other structures C. forming channels D. forming the entire glycocalyx

What part of a cell membrane is usually in contact with the interstitial fluid? A. hydrophobic molecules B. fatty acid tails C. cholesterol D. phosphate heads of phospholipids

You observe a small, nonpolar molecule near a membrane. How would this molecule likely transport across the membrane? A. carrier-mediated facilitated diffusion B. simple diffusion C. active transport D. channel-mediated facilitated diffusion

Which of the following is not a passive process? A. Na+/K+ pump B. osmosis C. oxygen diffusion D. facilitated diffusion of glucose

A primary active transport process is one in which __________. A. molecules move across the plasma membrane without an input of energy B. an intracellular vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid C. the plasma membrane folds inward to form a vesicle containing extracellular material D. molecules pass directly through the phospholipid bilayer of the plasma membrane E. molecules move through transport proteins that have been activated by ATP

Some transport processes use transport proteins in the plasma membrane, but do not require ATP. This type of transport is known as _____. A. facilitated diffusion B. endocytosis C. simple diffusion D. exocytosis E. active transport

The majority of water molecules moving across plasma membranes by osmosis do so via a process that is most similar to ____. A. cotransport B. a process that requires energy from the cell active transport C. facilitated diffusion D. simple diffusion

The sodium-potassium pump uses ATP to move sodium and potassium ions across the plasma membrane. This statement describes _____. A. exocytosis B. secondary active transport C. primary active transport D. facilitated diffusion E. simple diffusion

A vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid. This statement describes _____. A. endocytosis B. facilitated diffusion C. simple diffusion D. exocytosis E. active transport

What is the difference between active and passive transport across the plasma membrane? A) Active transport is used to move substances down their concentration gradient, whereas passive transport is used to move substances against their concentration gradient B) Active transport means that the cell is actively going after substances that it wants to bring into the cell, whereas passive transport means that the cell just waits for the substance to cross the membrane. C) Active transport implies that the cell is working with other cells, whereas passive transport implies that the cell does not cooperate with other cells. D) Active transport is ATP dependent, whereas passive transport uses only the kinetic energy of the particles for movement across the plasma membrane.

What is a membrane potential? A) cooperation between cells B) the possibility of cell activity C) the ability of the cells to perform their specialized functions D) a voltage or electrical charge across the plasma membrane

Match the following terms to their definitions. Words can be used more than once. A)Tight junctions B)Desmosomes C)Gap junctions 1. Tight junctions: Help prevent molecules from passing through the extracellular space between adjacent cells. 2. Desmosomes: Type of anchoring junction. 3. Gap junctions: Allows ions and small molecules to pass through from one cell to another. 4. Gap junctions: Present in electrically excitable tissues. 5. Desmosomes: Abundant in tissues subjected to great mechanical stress.

What function do transitional epithelia have? A) stretching B) absorption C) resistance to friction D) filtration

All epithelia have two surfaces, an apical surface and a basal surface, that differ in both structure and function. This property is called polarity. True False

Which of the following describes a holocrine gland? A) Holocrine glands secrete their products through a hollow, tubular duct. B) Holocrine glands secrete their products by rupturing. C) Holocrine glands secrete their products by pinching off the apex of the cell. D) Holocrine glands secrete their products by exocytosis.

You observe a tissue under a microscope. There appears to be a lumen on one side of the tissue. Lining this lumen, the cells seem to have long, fingerlike projections. Beneath the projections, the cells seem to have the shape of shoeboxes and are packed tightly together. What type of tissue are you looking at? A) simple columnar epithelia B) stratified squamous epithelia C) simple cuboidal epithelia D) transitional epithelia

Which of the following is a dry membrane exposed to the air? A) serous membrane B) synovial membrane C) cutaneous membrane D) mucous membrane