Q: Which of the following equations correctly represents the energy balance in the human body?

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

Question 1

Which hormone is primarily responsible for decreasing food intake when fat stores increase, and what is its main site of secretion?

Accepted Answer

Leptin, secreted by adipocytes

Question 2

A patient is found to have elevated plasma glucose levels, normal or high insulin levels, but their cells do not respond to insulin. Which condition best describes this scenario?

Accepted Answer

Type 2 diabetes mellitus

Question 3

Which of the following best explains why proteins cause a larger increase in resting metabolic rate after ingestion compared to fats?

Accepted Answer

Proteins are more difficult to digest and absorb, requiring more energy for metabolism.

Question 4

Which metabolic process is responsible for the synthesis of glucose from non-carbohydrate precursors, and in which state is it most active?

Accepted Answer

Gluconeogenesis; fasted state

Question 5

A marathon runner has depleted most of their glycogen stores after several hours of running. Which metabolic pathway will become increasingly important for maintaining blood glucose levels?

Accepted Answer

Gluconeogenesis

Question 6

Which of the following statements about energy storage is correct?

Accepted Answer

Fats provide more kilocalories per gram than carbohydrates or proteins.

Question 7

Which of the following best describes the role of the pancreas in metabolic homeostasis?

Accepted Answer

It secretes insulin and glucagon to regulate blood glucose levels.

Question 8

A person is exposed to cold temperatures for an extended period. Which physiological response is most likely to occur to maintain core body temperature?

Accepted Answer

Increased unregulated heat production through voluntary muscle contractions

Question 9

Which of the following equations correctly represents the energy balance in the human body?

Accepted Answer

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

Question 10

Which of the following is a characteristic symptom of heat stroke, distinguishing it from heat exhaustion?

Accepted Answer

Flushed, dry skin and a high risk of mortality

Question 11

During the fasted state, which hormone is dominant and what is its primary effect?

Accepted Answer

Glucagon; stimulates glycogen breakdown and glucose release

Question 12

Which process describes the breakdown of triglycerides into fatty acids and glycerol, and what is a potential consequence if this process is excessive?

Accepted Answer

Lipolysis; ketosis

Question 13

A patient with an autoimmune destruction of pancreatic beta cells will most likely require which of the following treatments?

Accepted Answer

Insulin injections

Question 14

Which of the following best explains why metabolic rate declines with age?

Accepted Answer

Lean muscle mass decreases, reducing overall oxygen consumption

Question 15

Which of the following is the correct sequence for the breakdown of fatty acids to generate ATP during the fasted state?

Accepted Answer

Lipolysis → Beta oxidation → Citric acid cycle

Question 16

Which of the following best describes the difference between basal metabolic rate (BMR) and resting metabolic rate (RMR)?

Accepted Answer

BMR is measured during sleep, while RMR is measured while awake but resting after a 12-hour fast.

Question 17

A person with metabolic syndrome is diagnosed when which combination of conditions is present?

Accepted Answer

Type II diabetes, atherosclerosis, and high blood pressure

Question 18

Which of the following best describes the fate of excess glucose in the fed state?

Accepted Answer

It is converted to glycogen and fat for storage.

Question 19

Which of the following best explains why oxygen consumption is used to estimate metabolic rate?

Accepted Answer

Oxygen is required for the breakdown of nutrients to produce ATP.

Question 20

A patient presents with confusion and loss of consciousness after prolonged exposure to cold. Which physiological changes are most likely responsible?

Accepted Answer

Decreased enzymatic reactions and reduced oxygen consumption

Metabolism and Energy Balance: Study Notes

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