What Are Macronutrients? - Definition, Functions & Examples

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In any known profit-driven economy, health considerations are hardly a priority; effective production of cheap foods with a long shelf-life is more the trend. There is one substance though that is more complicated and vital to life. Retrieved December 22, Thanks to David Patterson for submitting information in this section. Scurvy , later found to be a vitamin C deficiency , was first described in BC in the Ebers Papyrus. Listen to this book now by clicking on this link to Yahoo!

Origin and Insertion

Muscle Origin and Insertion: Definition and Actions

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Glencoe Chemistry - Matter And Change: High School Physical Science: Macronutrients are energy-providing chemical substances consumed by organisms in large quantities. In carbohydrates, there are 4 calories per gram. In proteins, there are 4 calories per gram. And in lipids, there are 9 calories per gram. Carbohydrates Humans need carbohydrates in the largest amounts.

Want to learn more? Select a subject to preview related courses: Lipids Lipids , or fats, are substances that do not dissolve in water, and are necessary for survival. Lesson Summary Let's review. Their important functions include: They are easily metabolized. They're used as the body's main fuel source. They free up other macronutrients for important jobs like tissue growth and repair. They help the brain, kidneys, muscles and heart function properly. They aid in the synthesis of some amino acids.

They're necessary to properly metabolize fats. In the form of fiber, they're necessary for intestinal health. Protein is also critical for the human diet. It's the major constituent of most cells, and the body is made up of thousands of proteins. It's used to produce new tissue. It helps regulate and maintain body functions.

It makes up enzymes that help with digestion, protection, and immunity. It also makes up essential hormones for body regulation. And it can be used as a source of energy when carbohydrates aren't available. Lastly, we also need lipids , or fats. They aid in many crucial things like: They help maintain cellular membranes. They're a high-density energy source. They help us absorb fat-soluble vitamins. They cushion organs and insulate the body. They provide raw materials for vitamin D and hormones.

And they improve taste, consistency, and stability in foods, and make us feel full after eating. Learning Outcomes Following this video lesson, you should be able to: Define nutrients and macronutrients Identify the three macronutrients required by humans Describe the functions of each of the macronutrients.

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The Book - A highly recommended freshwater protozoa guide! A Color Guide by David J. Book Description This color book makes the identification of individual protozoa easily accessible and provides information on protozoan communities found in different environments by means of a wealth of color photomicrographs supported by original and detailed line drawings and concise text. Contains excellent information for ecologists as well. Thanks to David Patterson for submitting information in this section.

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Diseases caused by fungi and parasites are relatively uncommon in developed countries. Fungal infections, also known as mycotic infections, may affect the skin surfaces or the internal organs of the body. The superficial mycotic infections are generally not serious and include…. Fungi are eukaryotic organisms; i.

Historically, fungi were included in the plant kingdom; however, because fungi lack chlorophyll and are distinguished by unique structural and physiological features i. In addition, fungi are clearly distinguished from all other living organisms, including animals, by their principal modes of vegetative growth and nutrient intake.

Fungi grow from the tips of filaments hyphae that make up the bodies of the organisms mycelia , and they digest organic matter externally before absorbing it into their mycelia. While mushrooms and toadstools poisonous mushrooms are by no means the most numerous or economically significant fungi, they are the most easily recognized.

The Latin word for mushroom , fungus plural fungi , has come to stand for the whole group. Fungi other than mushrooms are sometimes collectively called molds, although this term is better restricted to fungi of the sort represented by bread mold.

For information about slime molds, which exhibit features of both the animal and the fungal worlds, see protist. We welcome suggested improvements to any of our articles. You can make it easier for us to review and, hopefully, publish your contribution by keeping a few points in mind.

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What are Macronutrients?