Final Flashcards
the starchy seed of plants that produce bean pods, including peas, peanuts, beans, soybeans and lentils
legumes
the building blocks of proteins. Each contains an amino group, an acid group and a unique side chain
amino acids
amino acids contain
a carbon atom that is bound to a hydrogen atom, an amino group which contains nitrogen, acid group and a side chain
amino acids that cannot be synthesized by the body in sufficient amounts to meet its needs and therefore must be included in the diet
essential amino acids or indispensable amino acids
under certain conditions, some of the nonessential amino acids cannot be synthesized in sufficient amounts to meet the bodys needs
conditionally essential amino acids
a genetic disease in which the amino acid phenylalanine cannot be metabolized normally, causing it to build up in the blood. If untreated, the condition results in brain damage
Phenylketonuria (PKU)
used to link together amino acids to form proteins. They join the amino group of one amino acid to the amino group of another amino acid
peptide bonds
a chain of amino acids linked by peptide bonds that is part of the structure of a protein
polypeptide
alteration of a proteins three dimensional structure
denaturation
all the amino acids in body tissues and fluids that are available for use by the body
amino acid pool
the process by which an amino group from one amino acids is transferred to a carbon compound to form a new amino acid
transamination
the essential amino acid that is available in the lowest concentration relative to the bodys needs
limiting amino acid
a condition characterized by loss of muscle and fat mass and an increased susceptibiliy to infection that results from the long term consumption of unsufficient amounts of energy and/or protein to meet the bodys needs
protein energy malnutrition (PEM)
a form of protein energy malnuitrition in which a deficiency of energy and protein in the diet causes severe body wasting
marasmus
an adverse immune response to a specific food protein
food allergy
an adverse reaction to a food that typically does not involve the production of antibodies by the immune system
food intolerance or food sensitivity
a disorder that causes damage to the intestines when the protein gluten is eaten
celiac disease
the amount of nitrogen consumed in the diet compared with the amount excreted over a given period
nitrogen balance
the process of combining proteins from different sources so that they collectively provide the proper proportions of amino acids required to meet the bodys needs
protein complementation
the extent to which the body can absorb and use a nutrient
bioavailability
a compound that can be converted into the active form of a vitamin in the body
provitamin or vitamin precursor
organic non-protein substances that bind to enzymes to promote their activity
coenzymes
a substance that is able to neutralize reactive oxygen molecules and thereby prevent cell damage
antioxidant
caused when reactive oxygen molecules steal electrons from, or oxidize, other compounds, causing changes in their structure and function
oxidative damage
one type od highly reactive atom or molecule that causes oxidative damage
free radicals
a thiamin deficiency disease that causes weakness, nerve degeneration and in some cases, heart changes
beriberi
a chemical substance produced by a nerve cell that can stimulate or inhibit another cell
neurotransmitters
a disease resulting from niacin deficiency, which causes dermatitis, diarrhea, dementia and if not treated death
pellagra
part of the coenzyme that replenishes the oxaloacetate stores needed for the citric acid cycle to occur
biotin
three forms of vitamin B6
pyridoxal
pyridoxine
pyridoxime
a b vitamin that is especially important during embryonic development
folate
abnormalities in the brain or spinal cord that result from errors that occur during prenatal development
neural tube defects
an easily absorbed form of the vitamin folate that is used in dietary supplements and fortified foods
folic acid
a reduction in the bloods capacity to carry oxygen that is characterized by abnormally large immature and mature red blood cells
macrocytic anemia or megaloblastic anemia
a macrocytic anemia resulting from vitamin B12 deficiency that occurs when dietary vitamin B12 cannot be absorbed due to a lack of intrinsic factor
pernicious anemia
a protein produced in the stomach that is needed for the absorption of adequate amounts of vitamin B12
intrinsic factor
an inflation of the stomach lining that results in reduced secretion of stomach acid, microbial overgrowth and in severe cases, a reduction in the production of intrinsic factor
atrophic gastritis
Best known for its role in the synthesis and maintenance of collagen
vitamin c
a vitamin C deficiency disease characterized by bleeding guns, tooth loss, joint pain, bleeding into the skin and mucous membranes and fatigue
scurvy
a provitamin that can be converted into vitmain A
beta carotene
the chemical forms of preformed vitamin A: retinol, retinal and retinoic acid
retinoids
natural pigments synthesized by plants and many microorganisms. They give yellow and red-orange fruits and vegetables their color. once inside the body, they can be converted into retinoids
carotenoids
the amount of retinol, beta-carotene, alpha-carotene or beta-cryptoxanthin that provides vitamin A activity equal to 1 microgram of retinol
RAE
the process whereby immature cells chage in structure and function to become spcialized
normal cell differentiation
the events of protein synthesis in which the information coded in a gene is used to synthesize a protein
gene expression
a spectrum of eye conditions resulting from vitamin A deficiency that may lead to blindness
xerophthalmia
a condition caused by the accumulation of cartenoids in the adipose tissue, causing the skin to appear yellow-orange
hypercarotenemia
a hormone released by a parathyroid gland that acts to increase blood calcium levels
parathyroid hormone (PTH)
only 10-15% of the calcium in the diet can be absorbed
when vitamin d is deficient
a vitamin D deficiency disease in children, characterized by poor bone development resulting from inadequate calcium absorption
ricket
a vitamin D deficiency disease in adults, characterized by loss of minerals from bone, bone pain, muscle aches and an increase in bone fractures
osteomalacia
• An antioxidant that protects lipids throughout the body by neutralizing reactive oxygen compounds before they can cause damage
vitamin e
a length of DNA that contains the informaiton needed to synthesize a specific polypeptide chain
genes
RDA of protein for adults
0.8 g/kg body weight
RDA of protein for pregnant women
25 g/day
RDA of Vitamin C for cigarette smokers
extra 35 mg/day
provitamin A cartenoids (2)
Alpha-carotene
beta-cryptoxanthin
cartenoids not converted into retinols
antioxidants
characteristics of animal sources of protein (5)
complete proteins
higher in total protein content
have B vitamins, iron, zinc, calcium
low in fibre
high in saturated fata nd cholesterol
characteristics of plant sources of protein (3)
incomplete proteins
contains some B vitamins, iron, zinc, calcium but less available in body
high in fibre, unsaturated fats and phytochemicals
4 levels of protein structure
primary structure
secondary structure
tertiary structure
Quaternary structure
polypeptide chain
primary structure
hydrogen bonds between side chains in the polypeptide help form alpha-helics and beta pleated sheets
secondary structure
disulphide, hydrogen bonds etc between side chain
tertiary structure
the binding 2+ polypeptide chains together
Quaternary structure
protein functions (6)
structure
enzymes
transport
protection from disease
contractions
fluid balance
maybe characteristics of high protein diet (6)
associated with weight loss
requires more water
increase kidney failure
increase calcium loss
risk of kidney stones
trigger intolerances or allergies
risks of vegetarian and vegan diets (5)
vitamin and mineral deficiencies are more common
vegans require B12 supplements
calcium, vitamin D deficiences from no sairy products
iron and zinc are poorly absorbed from plants
omega 3 may be low in vegan diets
affects on bioavailability of vitamins (6)
efficiency of digestion and time of transit
previous nutrient intake and nutrition status
other foods consumed at the same time
method of preparation
sources of the nutrient
from foods vs supplements
antioxidants (3)
vitamin c
vitamin e
carotenoids
critical for maintaining calcium and phosphorus levels in the body
vitamin d
characteristics of water soluble vitamins (6)
absorbed directly into blood
no transport required
stored freely in aqueous compartments
excreted readily via kidney
toxicity only from supplements
required every 1-3 days
characteristics of fat soluble vitamins (7)
vitamins A,D,E,K
absorbed with lipids into lymph
transported with lipids within lipoproteins
stored in cells associated with fat
not readily excreted
toxicity more likely
required weeks to months
functions of water (6)
solvent
medium and participates in metabolic reaction
transports nutrients and waste
protection
regulation of body temperature
regulates acids base balance
affects on bioavailability of minerals (5)
source
what else was eaten at the same time
preparation
individual
plants may contain oxalates, phytates, tannins and fibre that can bind minerals in GI tract ad reduce absorption
contained in plants that can bind minerals in GI tract and reduce absorption (4)
oxalates
phytates
tannins
fibre
drop in blood calcium levels causes
increase in parathyroid hormone release
increase in blood calcium levels
increase in calcitonin release
a state that occurs when not enough water is present to meet the body’s needs
dehydration
water amounts in body (3)
60% of body weight
75% of muscle
25% of bone
the amount of force exerted by the blood against the walls of arteries
blood pressure
Our body works very diligently to maintain blood pressure through three main mechanisms
thirst
water reabsorbtion at kidneys
vasoconstriction
wastes that must be eliminated (5)
urea
nitrogen containing molecules
ketones
sodium
other minerals
drop in blood pressure signals muscle automatically regulated by brain to contract. this narrows blood vessel and increases blood pressure accordingly
vasoconstriction
a condition that occurs when a person drinks enough water to significantly lower the concentration of sodium in the blood
water intoxication
the concentration of sodium in the blood drops
hyponatremia
DRI for water
- 7 L for men
2. 7 L for women
increases water need (3)
low calorie diet
high salt diet
high fibre diet
a substance that increases the amount of urine passed from the body
diuretic