Which of the following is not a characteristic of epithelial tissue?
Forms glands that secrete substances into and out of the body
Is important in communication and control
Covers and protects body surfaces
Lines the interior of body cavities
The Correct Answer is B
A. Forms glands: This is a core function of glandular epithelium (endocrine and exocrine).
B. Is important in communication and control: This is the primary characteristic of nervous tissue, not epithelial tissue.
C. Covers and protects body surfaces: This is the primary role of surface epithelium (like the skin).
D. Lines the interior of body cavities: This is the role of the endothelium and mesothelium, which are epithelial in nature.
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Related Questions
Correct Answer is D
Explanation
A. Buffering: Chemical buffers in the blood (like the bicarbonate system) provide the first line of defense against pH changes.
B. Respirations: The lungs help regulate pH by exhaling or retaining carbon dioxide (CO2), which is acidic.
C. Urine secretion: The kidneys maintain long-term balance by excreting hydrogen ions (H+) and reabsorbing bicarbonate.
D. All of the above: The body requires the integrated action of chemical buffers, the respiratory system, and the urinary system to maintain a stable pH.
Correct Answer is D
Explanation
A. Isotonic: In an isotonic contraction, the muscle changes length to move a load. If the object is too heavy to lift, no movement occurs.
B. Flaccid: Flaccid refers to a lack of muscle tone (limpness), which is not the state of a muscle trying to lift a heavy weight.
C. Treppe: Treppe (the "staircase effect") refers to an increase in the force of contraction when a muscle is stimulated repeatedly after relaxation.
D. Isometric: An isometric contraction occurs when tension increases in the muscle, but the muscle does not shorten because the load is too great to move.
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