chapter 17 – part 3. figure 6.6 how does the body use protein? functions of protein ◦ provide...
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ProteinsChapter 17 – Part 3
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Protein in the Body
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Protein Digestion: Part 1
Figure 6.6
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Protein Digestion: Part 2
Figure 6.6
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Protein Digestion: Part 3
Figure 6.6
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Protein Digestion: Part 4
Figure 6.6
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How Does the Body Use Protein? Functions of protein
◦ Provide structural and mechanical support◦ Maintain body tissues◦ Functions as enzymes and hormones◦ Help maintain acid base balance◦ Transport nutrients◦ Assist the immune system◦ Serve as a source of energy when necessary
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Essential, Nonessential, and Conditional Essential – must be consumed in the
diet Nonessential – can be synthesized in
the body Conditionally essential – cannot be
synthesized due to illness or lack of necessary precursors
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Body creates all of its proteins from 22 different amino acids
13 are manufactured 9 are essential amino acids – body needs
them but cannot make them
AMINO ACID
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Protein Quality
Complete proteins ◦ Contain all nine essential amino acids.◦ Usually animal source are complete proteins.◦ Sources: Fish, meat, poultry, eggs, milk,
cheese, yogurt, and many soybean products.
Incomplete proteins ◦ Low in one or more essential amino acid.◦ Plant sources are incomplete.◦ Sources: Beans, peas, nuts, and whole grains.
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How Much Protein Do You Need? Healthy, non-pregnant adults
◦ Should consume enough to replace what is used every day
◦ Goal is nitrogen balance Pregnant women, people recovering
from surgery or injury, and growing children◦ Should consume enough to build new
tissue
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Muscles, ligaments, tendons, and bones
Without these particular structural proteins, we would look more like this….
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Well, maybe not exactly…