In channel mediated facilitated diffusion,
binding is limited to transport maximums.
substances bind to protein carriers.
substances move through fluid-filled, transmembrane proteins.
facilitated active transport is necessary.
The Correct Answer is C
A. Binding is limited to transport maximums: This concept applies to carrier-mediated transport where saturation can occur, but channel-mediated diffusion does not rely on binding and does not reach a transport maximum in the same way.
B. Substances bind to protein carriers: Carrier proteins facilitate movement by binding specific molecules and undergoing conformational changes. Channel-mediated facilitated diffusion does not involve this binding mechanism.
C. Substances move through fluid-filled, transmembrane proteins: In channel-mediated facilitated diffusion, specific substances pass through aqueous channels formed by transmembrane proteins. These channels allow ions or small polar molecules to move down their concentration gradients without energy input.
D. Facilitated active transport is necessary: Channel-mediated diffusion is passive and does not require ATP. Active transport involves energy to move substances against their concentration gradient, which is not the case here.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Hydrogen, carbon, potassium, nitrogen: While hydrogen, carbon, and nitrogen are major elements in the human body, potassium is a trace element and does not contribute significantly to the 96% composition.
B. Carbon, nitrogen, oxygen, hydrogen: These four elements constitute approximately 96% of the human body. They form the building blocks of organic molecules such as proteins, carbohydrates, lipids, and nucleic acids, making them essential for life.
C. Phosphorus, calcium, nitrogen, hydrogen: Phosphorus and calcium are important elements, particularly in bones and energy molecules, but they are present in much smaller amounts compared to carbon, hydrogen, oxygen, and nitrogen.
D. Calcium, helium, oxygen, nitrogen: Helium is not a biological element in the human body, and while calcium, oxygen, and nitrogen are present, this set does not reflect the four major elements that make up 96% of body composition.
Correct Answer is A
Explanation
A. Urinary system: The urinary system, including the kidneys, ureters, bladder, and urethra, filters blood to remove metabolic waste, regulates fluid volume, controls electrolyte levels, and maintains acid-base balance. It also influences blood pressure through the renin-angiotensin-aldosterone system.
B. Cardiovascular: The cardiovascular system transports blood, nutrients, gases, and waste products throughout the body, but it does not directly eliminate waste or regulate electrolytes and acid-base balance.
C. Digestive system: The digestive system breaks down food, absorbs nutrients, and eliminates solid waste, but it does not play a primary role in regulating blood pressure or electrolyte balance.
D. Immune system: The immune system defends the body against pathogens and foreign substances but does not manage waste elimination, electrolyte balance, or blood pressure.
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