Chapter 2, Problem 8SC

Which tissue type consisting of sheetlike layers of cells can both exchange oxygen and act as a barrier to bacteria? a. nervous b. epithelial c. connective d. muscle e. heart

Figure 33.11 Which of the following statements about types of epithelial cells is false? Simple columnar epithelial cells line the tissue of the lung. Simple cuboidal epithelial cells are involved in the filtering of blood in the kidney. Pseudostratisfied columnar epithilia occur in a single layer, but the arrangement of nuclei makes it appear that more than one layer is present. Transitional epithelia change in thickness depending on how full the bladder is.

Tissue that contracts and is striated and involuntary would most likely be found in (a) the leg (b) the wall of the stomach (c) the exocrine glands (d) body structures requiring very rapid contraction (e) the heart

_______ tissues are sheetlike with one free surface. a. Epithelial b. Connective c. Nervous d. Muscle

When William H. was helping victims after a devastating earthquake in a region not prepared to swiftly set up adequate temporary shelter, he developed severe diarrhea. He was diagnosed as having cholera, a disease transmitted through unsanitary water supplies contaminated by fecal material from infected indiv iduals. The toxin produced by cholera bacteria causes Cl- channels in the lurninal membranes of the intestinal cells to stay open, thereby increasing the secretion of Cl- from the cells into the intestinal tract lumen. By what mechanisms would Na+ and water be secreted into the lumen in conjunction with Cl- secretion? How does this secretory response account for the severe diarrhea that is characteristic of cholera?

New research suggests a link between some microbes that normally live in the body and seemingly unrelated major illnesses. The gum disease called periodontitis itself is not life-threatening, for instance, but it is a fairly good predictor for heart attacks. Bacteria that cause gum disease can trigger inflammation. Thinking back to your reading in Chapter 7, how do you suppose that this response also may be harmful to the heart?

A flexible, rubbery protein in connective tissue is called ___, whereas a more fibrous, less flexible glycoprotein is called ___. a. adipose; cartilage b. endocrine; exocrine c. sweat; hormones d. chondroitin sulfate; hydroxyapatite e. elastin; collagen

You are watching cells in a dish spontaneously contract. They are all contracting at different rates; some fast, some slow. After a while, several cells link up and they begin contracting in synchrony. Discuss what is going on and what type of cells you are looking at.

The endothelium is found in the ________. tunica intima tunica media tunica externa lumen