Glycolysis and aerobic respiration collectively produce up to produce
2; about the same, varying from one tissue to another
32: none
32:2
32:36
36; about the same, varying from one tissue to another
The Correct Answer is E
A. 2; about the same, varying from one tissue to another: This choice incorrectly identifies the ATP yield of aerobic respiration as being equal to anaerobic processes. Aerobic pathways are significantly more efficient than fermentation. Net energy gain from glucose oxidation far exceeds the 2 ATP molecules generated via substrate-level phosphorylation.
B. 32: none: While 32 ATP is a calculated estimate for aerobic yield, the second value is inaccurate. Anaerobic fermentation consistently produces a net gain of 2 ATP per glucose molecule. Total metabolic arrest does not occur, as glycolytic flux remains active to sustain cellular viability.
C. 32:2: This selection suggests a static ratio that ignores the physiological variability of the malate-aspartate and glycerol-3-phosphate shuttles. While 32 represents a common theoretical yield, it does not account for tissue-specific energetic differences. The total count often reaches higher values in oxidative fibers.
D. 32:36: These numbers invert the relationship between aerobic and anaerobic efficiency. 36 ATP represents a common total for complete oxidation in specific tissues like cardiac muscle. Anaerobic fermentation never yields 36 ATP, as it lacks the oxidative phosphorylation required for such high energy output.
E. 36; about the same, varying from one tissue to another: Aerobic respiration typically yields 36 to 38 ATP depending on the NADH shuttle system utilized. Conversely, anaerobic fermentation consistently yields 2 ATP across various cell types. The energy extracted during anaerobic pathways remains stable regardless of the specific tissue environment.
F. ATP per glucose, while glycolysis and anaerobic fermentation collectively: This phrase serves as a fragment of the question stem rather than a valid answer choice. It describes the comparison between the two metabolic states of glucose degradation. It provides no numerical data to satisfy the quantitative requirements of the prompt.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Hormone at E - Growth Hormone (GH): The diagram indicates that hormone E is released from the anterior pituitary and targets the liver and skeletal muscles. In the liver, it stimulates the production of insulin-like growth factors (IGFs) to promote systemic growth. Its action on skeletal muscle facilitates protein synthesis and tissue hypertrophy.
B. Hormone A - Prolactin (PRL): The diagram depicts hormone A traveling from the adenohypophysis to the mammary glands. This protein hormone is essential for initiating and maintaining milk production following parturition. Its secretion is regulated by hypothalamic dopamine, which serves as a primary prolactin-inhibiting factor.
C. Hormone B - Thyroid-stimulating Hormone (TSH): The pathway labeled B shows a tropic hormone targeting the thyroid gland. TSH stimulates the follicular cells of the thyroid to synthesize and release thyroxine and triiodothyronine. This hormone is a critical regulator of systemic basal metabolic rate and cellular heat production.
D. Hormone C - Gonadotropins (FSH and LH): Label C represents the gonadotropins, specifically follicle-stimulating hormone and luteinizing hormone, which target the testes and ovaries. These hormones regulate gametogenesis and the secretion of sex steroids like testosterone and estrogen. They are essential for the maintenance of reproductive cycles and secondary sexual characteristics.
E. Hormone at D - Adrenocorticotropic Hormone (ACTH): The diagram shows hormone D being secreted from the anterior pituitary and traveling specifically to the adrenal gland. More specifically, it targets the adrenal cortex to regulate the production of steroid hormones. It is a critical component of the hypothalamic-pituitary-adrenal (HPA) axis.
Correct Answer is A
Explanation
A. Digestion: This physiological process involves both mechanical mastication and chemical hydrolysis to convert complex food into absorbable molecules. It begins in the oral cavity and continues through the stomach and small intestine. It is the specific term for the multi-modal breakdown of nutritional matter.
B. Ingestion: This term refers specifically to the act of taking food or liquid into the body via the oral cavity. It is the entry phase of the nutritional process rather than the breakdown mechanism itself. Digestion follows ingestion but represents a distinct set of biochemical and physical actions.
C. Compaction: This process occurs primarily in the large intestine where water is absorbed from indigestible residue. It converts liquid chyme into consolidated feces for eventual excretion. It involves the dehydration of waste products rather than the constructive breakdown of food for nutrient extraction.
D. Absorption: This stage involves the movement of digested nutrients from the lumen of the gastrointestinal tract into the blood or lymph. It occurs after the mechanical and chemical breakdown of food is largely complete. It describes the uptake of molecules, not the process of breaking them down.
E. Extraction: In a biological context, this word is often used generally for the removal of specific substances from a mixture. It is not the standard clinical term used to describe the integrated digestive functions of the alimentary canal. It lacks the specificity required to describe human gastrointestinal physiology.
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