Which of the following best defines the state of energy balance?
When protein intake is exactly equal to fat intake
When caloric intake exceeds the amount of energy expended
When caloric intake is equal to the amount of energy expended
When caloric intake is lower than the amount of energy expended
The Correct Answer is C
A. Energy balance is not determined by the ratio of protein to fat intake. While macronutrient composition affects overall health, metabolism, and satiety, the concept of energy balance specifically refers to the relationship between calories consumed and calories expended, regardless of whether those calories come from protein, fat, or carbohydrates.
B. Consuming more calories than the body expends leads to a state of positive energy balance. Over time, this excess energy is stored as fat, resulting in weight gain. Positive energy balance is the opposite of maintaining stable weight and does not represent true energy balance.
C. Energy balance occurs when caloric intake matches the body’s energy expenditure, which includes basal metabolic rate (BMR), physical activity, and the thermic effect of food (energy used to digest, absorb, and metabolize nutrients). Maintaining energy balance is essential for sustaining a stable body weight, supporting normal physiological functions, and preventing chronic conditions such as obesity or malnutrition. This balance ensures that energy intake provides enough fuel for daily activities without excess storage or depletion.
D. When caloric intake is lower than energy expenditure, the body is in a state of negative energy balance. This causes the body to use stored energy, primarily from fat and sometimes muscle tissue, leading to weight loss. While negative energy balance may be intentional for weight reduction, it is not a state of equilibrium.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The majority of triglycerides are stored in adipose tissue, which serves as the body’s primary long-term energy reserve. Adipose tissue is located beneath the skin (subcutaneous fat) and around internal organs (visceral fat). Triglycerides stored here can be broken down into fatty acids and glycerol during periods of energy deficit to provide fuel for the body.
B. Muscle tissue contains small amounts of triglycerides that provide local energy for muscle activity, but it is not the primary storage site for long-term energy.
C. The liver plays a role in metabolism, synthesizing and processing triglycerides, but it stores only small amounts for immediate use and is not the main energy reserve.
D. Lipoproteins are transport particles that carry triglycerides and cholesterol through the bloodstream, but they do not serve as storage sites for long-term energy.
Correct Answer is D
Explanation
A. The kidney does not synthesize red blood cells, but it does play a supportive role by producing erythropoietin, a hormone that stimulates red blood cell production in the bone marrow.
B. Collagen is a structural protein found in connective tissues, skin, and bones. It provides strength and support but has no role in red blood cell production.
C. Chondrocytes are specialized cells found in cartilage tissue. They are responsible for producing and maintaining the cartilaginous matrix, not blood cells.
D. Bone marrow is the primary site of hematopoiesis, the process of synthesizing red blood cells, white blood cells, and platelets. Red blood cells are produced from hematopoietic stem cells in the red bone marrow, providing oxygen transport throughout the body. This process is vital for maintaining adequate oxygen delivery to tissues and supporting overall metabolic function.
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