Chapter 8: Lesson 1

Question 1

Adenosine triphosphate (ATP)

Answer 1

A high-energy molecule that serves as the main form of energy in the human body; known as the energy currency of the body.

Question 2

Bioenergetics

Answer 2

The study of energy in the human body.

Question 3

Metabolism

Answer 3

All of the chemical reactions that occur in the body to maintain itself.

Question 4

Exercise metabolism

Answer 4

The examination of bioenergetics as it relates to the unique physiologic changes and demands placed on the body during exercise.

Question 5

First law of thermodynamics

Answer 5

Energy cannot be created or destroyed but merely converted from one form to another.

Question 6

Macronutrients

Answer 6

Food substances required in large amounts to supply energy and include protein, carbohydrate, and fat.

Question 7

Substrates

Answer 7

Intermediate forms of nutrients used in metabolic reactions to create adenosine triphosphate.

Question 8

Glucose

Answer 8

The simplest form of carbohydrate used by the body for energy.

Question 9

Glycogen

Answer 9

Glucose that is deposited and stored in bodily tissues, such as the liver and muscle cells; the storage form of carbohydrate.

Question 10

Ventilatory threshold 1 (VT1)

Answer 10

The point at which the body uses an equal mix of carbohydrate and fat as fuel sources.

Question 11

Ventilatory threshold 2 (VT2)

Answer 11

The point where glucose provides nearly all of the energy for the activity.

Question 12

Fats

Answer 12

One of the three main classes of foods and a source of energy in the body. Fats help the body use some vitamins and keep the skin healthy. They also serve as energy stores for the body. In food, there are two types of fats: saturated and unsaturated.

Question 13

Triglyceride

Answer 13

The chemical or substrate form in which most fat exists in food as well as in the body.

Question 14

Free fatty acids

Answer 14

The by-products of the breakdown of stored or consumed fats, metabolized exclusively via the aerobic pathway, which uses oxygen to create adenosine triphosphate.

Question 15

Protein

Answer 15

Amino acids linked by peptide bonds; the building blocks of body tissues.

Question 16

Essential amino acid (EAA)

Answer 16

Amino acid that must be obtained through the diet as the body does not make it; there are nine essential amino acids.

Question 17

Nonessential amino acids

Answer 17

Amino acids that can be synthesized by the body and do not, under normal circumstances, need to be obtained in the diet.

Question 18

Negative energy balance

Answer 18

When calorie intake is lower than the number of calories expended.

Question 19

Gluconeogenesis

Answer 19

The formation of glucose from noncarbohydrate sources (proteins and fats).

Question 20

Ketogenesis

Answer 20

The formation of ketone bodies from nonfat sources, such as certain amino acids.

Question 21

Ketone bodies

Answer 21

Water-soluble molecules produced in the liver as a result of fatty acid oxidation. They can then be oxidized in the mitochondria to produce adenosine triphosphate.

Question 22

Ketosis

Answer 22

A state of carbohydrate depletion where the liver manufactures ketone bodies to meet energy demands that free fatty acid oxidation cannot support.

Question 23

Exogenous ketones

Answer 23

Isolated ketone bodies usually consumed in supplement form.

Question 24

Insulin resistance

Answer 24

The inability of the cells to respond to insulin; occurs in type 2 diabetes.

Question 25

Ketoacidosis

Answer 25

Metabolic acidosis induced by very high levels of ketone bodies such as seen in type 1 diabetes or severe insulin resistance.