A major distinction between the connective tissues in an animal and other main tissue types such as epithelium, nervous tissue, or muscle is _______________
(a) the ability of connective-tissue cells such as fibroblasts to change shape.
(b) the amount of extracellular matrix in connective tissues.
(c) the ability of connective tissues to withstand mechanical stresses.
(d) the numerous connections that connective-tissue cells make with each other.
Choice (b) is correct. Cells in nonconnective tissues can change shape [for example, muscle cells when they contract; choice (a)], and can withstand mechanical stress [for example, cells of the epidermis; choice (c)]. Cells in connective tissue tend to be scattered throughout the extracellular matrix and make few or no contacts with each other, unlike nerve cells or epithelial cells.
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Determine the rate of diffusion in the gas-exchange organ of an air-breathing animal where the area for gas exchange in the lung is 200 mm2,
the diffusion constant is 0.08, the (partial pressure of oxygen) of the air in the lung is 140 mm Hg, the in blood flowing into the lung is 90 mmHg, and the thickness of the gas exchange membrane is 0.001 mm. A) 800,000 B) 125 C) 00032 D) 10,000,000
There is a standing debate among biologists involved in looking for life on other planets as to how any alien organisms should be handled. Some feel that alien organisms should not be introduced on Earth; others feel that investigating these alien organisms will provide important information. What are some of the arguments on both sides?
What will be an ideal response?
When amino acids are degraded in cells, into what intermediate(s) of the aerobic respiration process are the carbon skeletons of amino acids primarily converted?
A. pyruvate and Krebs cycle intermediates B. pyruvate and acetyl-CoA C. Krebs cycle intermediates D. pyruvate E. acetyl-CoA
A cohort is ____.
A. a group of individuals of the same species born during the same time interval B. any member of the same species C. a group of individuals with the same parents D. a group of individuals of the same sex E. any group of closely related individuals