Which of the following is involved in mechanical digestion of food?
Enzymes
Peristalsis
Gastric Juice
Hydrochloric acid
The Correct Answer is B
A. Enzymes: Enzymes (salivary, gastric, pancreatic, brush-border) mediate chemical digestion by breaking down macromolecules -not mechanical digestion.
B. Peristalsis: Peristalsis is a muscular movement that propels and helps mechanically mix food; it is a form of mechanical digestion/transport.
C. Gastric Juice: Gastric juice (HCl, pepsinogen) contributes to chemical digestion and acidic breakdown of proteins, not mechanical breakdown.
D. Hydrochloric acid: HCl denatures proteins and activates pepsinogen (chemical digestion); it is not a mechanical process.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","C"]
Explanation
A. Protects against heart disease: Estrogen has several effects on the cardiovascular system (improving lipid profile and vascular function) that are thought to reduce cardiovascular risk prior to menopause.
B. Helps regulate the menstrual cycle: Estrogen is a key ovarian hormone that helps regulate the growth of the endometrium and the timing of the menstrual cycle .
C. Promotes bone growth: Estrogen is essential for bone homeostasis, inhibiting bone resorption and helping maintain bone density .
D. Increases testosterone production: Estrogen does not increase testosterone production; testosterone is produced by Leydig cells in males (and ovaries/adrenals in females) and is not a primary product increased by estrogen .
Correct Answer is D
Explanation
A. 70–80%:This range is typical for newborns/infants, not average adults.
B. 10–20%:Far too low -corresponds to extreme dehydration or measurement error; not normal.
C. 30–40%:Lower than typical adult values; may be seen in elderly people with high fat mass.
D. 50–60%:Average adult total body water is roughly 50–60% of body weight (higher in lean males, lower in females/older adults).
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