___ epithelium allows for rapid diffusion of oxygen and carbon dioxide through the alveoli of the lungs.
Nonkeratinized stratified squamous
Simple columnar
Simple squamous
Simple cuboidal
The Correct Answer is C
A. Nonkeratinized stratified squamous: This epithelium type is found in areas subject to friction and abrasion, such as the esophagus and oral cavity. Its multiple layers make it unsuitable for efficient gas exchange, as diffusion is slowed by the thickness of the tissue.
B. Simple columnar: Simple columnar epithelium is specialized for absorption and secretion, commonly found in the gastrointestinal tract. Its tall cell structure is not ideal for rapid diffusion, making it poorly suited for alveolar gas exchange.
C. Simple squamous: Simple squamous epithelium consists of a single, thin layer of flat cells. Its delicate structure provides a minimal barrier for diffusion, allowing oxygen and carbon dioxide to rapidly pass through the alveolar walls during respiration.
D. Simple cuboidal: Simple cuboidal epithelium is found in glands and kidney tubules where secretion and absorption occur. Its cube-shaped cells are thicker than squamous cells, creating a greater distance for gases to diffuse, which reduces efficiency in the lungs.
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Related Questions
Correct Answer is C
Explanation
A. conversion of glucose into carbon dioxide and water:This describes the complete process of cellular respiration, including the Krebs cycle and electron transport chain, not glycolysis.
B. formation of sugar:Glycolysis does not form sugar; it breaks down glucose molecules into smaller intermediates to release energy.
C. conversion of glucose into two molecules of pyruvic acid:Glycolysis involves the breakdown of one glucose molecule (6 carbons) into two pyruvic acid molecules (3 carbons each). This catabolic process releases a small amount of ATP and NADH.
D. conversion of pyruvic acid into carbon dioxide and water:This occurs during the later stages of cellular respiration, specifically the Krebs cycle and oxidative phosphorylation, rather than during glycolysis itself.
Correct Answer is C
Explanation
A. G1 (gap 1):During G1, the cell grows and performs normal metabolic activities. Organelles are duplicated, but DNA replication does not occur in this phase.
B. G2 (gap 2):G2 follows DNA synthesis and involves further cell growth and preparation for mitosis, including the production of proteins needed for cell division. DNA replication has already been completed by this point.
C. S (synthesis):The S phase is dedicated to DNA replication. Each chromosome is duplicated to ensure that the resulting daughter cells receive an identical copy of the genetic material.
D. metaphase:Metaphase is a stage of mitosis, not interphase. During metaphase, replicated chromosomes align at the cell’s equatorial plane in preparation for separation.
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