A tissue is:
a membrane that lines body cavities.
a group of similar cells that perform a common function.
a thin sheet of cells embedded in a matrix.
the most complex organizational unit of the body.
The Correct Answer is B
A. a membrane that lines body cavities: While membranes are made of tissues, this describes a specific structure (like a serous membrane), not the definition of tissue itself.
B. a group of similar cells that perform a common function: This is the standard biological definition of a tissue, which sits between the cellular and organ levels of organization.
C. a thin sheet of cells embedded in a matrix: This describes specific types of connective or epithelial tissues, but is too narrow to define all tissues.
D. the most complex organizational unit of the body: This is incorrect; the "organism" is the most complex unit, followed by organ systems and then organs.
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Naxlex Comprehensive Predictor Exams
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. a relative lack of ATP: ATP is required for the cross-bridge cycle; a deficiency prevents muscle contraction and relaxation.
B. high levels of lactate: Anaerobic respiration leads to lactic acid buildup, which lowers pH and interferes with enzyme activity and calcium binding.
C. failure of the sodium-potassium pumps: Ion imbalances caused by pump failure prevent the muscle membrane from repolarizing correctly.
D. all of the above: Muscle fatigue is a complex process caused by the combination of energy depletion, chemical buildup, and ion imbalances.
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