Q: According to the first law of thermodynamics, which equation best describes the relationship between energy input and output in the human body?

$$\text{Energy Input} = \text{Energy Output} + \text{Energy Stored}$$

Q: A food contains 10 g of carbohydrate, 5 g of protein, and 2 g of fat. Using the standard energy values ($$4$$ kcal/g for carbohydrate and protein, $$9$$ kcal/g for fat), what is the total energy content of the food?

$$10 \times 4 + 5 \times 4 + 2 \times 9 = 40 + 20 + 18 = 78$$ kcal

Q: Which equation best represents the calculation of Body Mass Index (BMI)?

$$\text{BMI} = \frac{\text{weight (kg)}}{\text{height (m)}^2}$$

Q: Which equation is used to estimate an individual's metabolic rate using oxygen consumption?

$$\text{Metabolic Rate} = \text{O}_2 \text{consumed} \times \text{Energy equivalent per liter O}_2$$

Question 1

Which hypothalamic center is primarily responsible for stimulating food intake, and what is one major factor that influences its activity?

Accepted Answer

The feeding center; influenced by ghrelin secretion

Question 2

According to the first law of thermodynamics, which equation best describes the relationship between energy input and output in the human body?

Accepted Answer

$$	ext{Energy Input} = 	ext{Energy Output} + 	ext{Energy Stored}$$

Question 3

Which of the following is NOT a form of biological work performed by the human body?

Accepted Answer

Thermal work

Question 4

A food contains 10 g of carbohydrate, 5 g of protein, and 2 g of fat. Using the standard energy values ($$4$$ kcal/g for carbohydrate and protein, $$9$$ kcal/g for fat), what is the total energy content of the food?

Accepted Answer

$$10 	imes 4 + 5 	imes 4 + 2 	imes 9 = 40 + 20 + 18 = 78$$ kcal

Question 5

Which factor can be voluntarily controlled to influence metabolic rate?

Accepted Answer

Physical activity level

Question 6

During the fasted state, which metabolic pathway is most active in the liver to maintain blood glucose levels?

Accepted Answer

Glycogenolysis

Question 7

Which plasma concentration is most closely regulated among the three nutrient pools (amino acids, free fatty acids, glucose)?

Accepted Answer

Glucose

Question 8

What is the primary signal for a shift to the fasted-state metabolism?

Accepted Answer

Decrease in plasma insulin

Question 9

Which equation best represents the calculation of Body Mass Index (BMI)?

Accepted Answer

$$	ext{BMI} = \frac{	ext{weight (kg)}}{	ext{height (m)}^2}$$

Question 10

Which hormone is dominant during the fed state and what is its primary metabolic effect?

Accepted Answer

Insulin; promotes glucose uptake and storage

Question 11

Which process describes the conversion of amino acids into glucose during prolonged fasting?

Accepted Answer

Gluconeogenesis

Question 12

After absorption, how are dietary triglycerides transported in the blood?

Accepted Answer

As chylomicrons

Question 13

Which metabolic pathway is triggered by glucagon during the fasted state?

Accepted Answer

Glycogenolysis

Question 14

Which of the following is a primary characteristic of untreated type 1 diabetes mellitus?

Accepted Answer

Hyperglycemia

Question 15

Which equation is used to estimate an individual's metabolic rate using oxygen consumption?

Accepted Answer

$$	ext{Metabolic Rate} = 	ext{O}_2 	ext{consumed} 	imes 	ext{Energy equivalent per liter O}_2$$

Question 16

Which of the following is NOT a potential fate of absorbed amino acids?

Accepted Answer

Storage as glycogen

Question 17

Which lipoprotein is most closely associated with increased risk of heart disease?

Accepted Answer

Low-density lipoprotein (LDL)

Question 18

Which process is responsible for the breakdown of triglycerides into glycerol and fatty acids during fasting?

Accepted Answer

Lipolysis

Question 19

Which of the following best describes metabolic syndrome?

Accepted Answer

A cluster of conditions including hypertension, hyperglycemia, and dyslipidemia that increase cardiovascular risk

Question 20

Which hormone is secreted by pancreatic beta cells and what is its primary effect?

Accepted Answer

Insulin; decreases blood glucose

Chapter 22: Metabolism and Energy Balance – Study Guide

Study Guide - Practice Questions

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