You have lost the labels to your muscle tissue slides in laboratory. Explain the characteristics that allow you to distinguish among skeletal muscle, smooth muscle, and cardiac muscle tissue
What will be an ideal response?
Although cells in both skeletal muscle tissue and cardiac muscle tissue are striated, look for intercalated discs and branched cells in the cardiac muscle cells to distinguish between these two tissues. Furthermore, skeletal muscle cells are multinucleate while cardiac muscle cells are uninucleate. Cells in smooth muscle tissue lack striations, making it easy to distinguish from skeletal and cardiac muscle tissues. Like the cells in cardiac muscle tissue, smooth muscle cells are uninucleate. However, smooth muscle tissue cells do not branch nor do they possess intercalated discs.
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If the Tm for a particular amino acid is 120 mg/100 ml and the concentration of that amino acid in the blood is 230 mg/100 ml, the amino acid will ________.
A) be actively secreted into the filtrate B) be completely reabsorbed by the tubule cells C) appear in the urine D) be reabsorbed by secondary active transport
The gonads, or primary sex organs, produce sex cells, also known as ________
In an action potential, which event directly follows repolarization?
A. Hyperpolarization of the membrane B. The resting membrane potential is reinstated C. Threshold is reached D. Hypopolarization of the membrane E. Depolarization of the membrane
Because they produce ribosome subunits, one would expect to find large numbers of nucleoli in cells that synthesize
A. energy sources. B. pigments. C. solubility-enhancing substances. D. steroid hormones. E. proteins.