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Consider a study designed to investigate whether the amount of energy expended by patients with the congenital disease cystic fibrosis is higher than that of a normal, healthy person. The variable of interest is

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Final answer:

The study investigates whether patients with cystic fibrosis, an autosomal recessive genetic disease, expend more energy than healthy individuals due to the dysfunction of the CFTR protein which results in thick mucus affecting their respiratory and digestive systems.

Step-by-step explanation:

The study you are referring to involves researching whether patients with cystic fibrosis expend more energy than healthy individuals. Cystic fibrosis is an autosomal recessive genetic disease characterized by the production of thick and sticky mucus, which can clog respiratory and digestive organs. This leads to frequent lung infections and problems with nutrient absorption. The underlying cause is a mutation in the CFTR gene, which normally produces a protein that regulates the transport of chloride ions across cell membranes. The faulty protein in CF patients results in the characteristic thick mucus.

Cystic fibrosis affects a significant number of people, with advanced medical treatments now enabling many of those patients to live into their 30s or beyond. It was only decades ago that a CF diagnosis meant a significantly shorter lifespan. Today's improved management and care are a testament to the ongoing advancements in medicine.

When it comes to energy expenditure in CF patients versus healthy individuals, the disrupted function of the CFTR protein could lead to altered metabolic processes, possibly increasing the body's energy demands. This investigation would be crucial for understanding the metabolic needs and improving the quality of life for those living with CF.

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