Explain why transporting epithelial cells are said to be polarized. What does it mean when a nerve cell is said to be polarized?
What will be an ideal response?
Transport epithelia have cells that are polarized with respect to distribution of transport proteins in the apical and basolateral membranes, i.e., different types of transporters in the two membranes. Nerve cells are electrically polarized, meaning that the inside of the membrane is charged relative to the outside.
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Elderly persons may become less able to maintain stable body temperature because
A) their sebaceous glands become overactive. B) the skin becomes too oily. C) the number of sweat glands diminishes. D) they sweat excessively.
Amanda has no visual impairments, but has noticed that in order to see clearly she must hold books farther from her face in order to read. What is happening to Amanda's vision?
A. Her lens is becoming more opaque with age. B. Her vitreous humor is becoming thicker with age. C. Her lens is becoming more flexible with age. D. Her lens is becoming more rigid with age. E. Her lens is becoming more convex with age.
What is a disc-shaped structure with especially adhesive glycoproteins around each cell that bind cells to one another?
A. Adhesion belt B. Tight junction C. Gap junction D. Hemidesmosomes E. Desmosomes
The patellar surface is a feature of the tibia.
Answer the following statement true (T) or false (F)