bolded terms Flashcards
what is bioavailability?
the extent to which the body can absorb/use a nutrient
what is a provitamin/vitamin precursor?
compound that can be converted into an active form of vitamin in the body
what is coenzyme?
organic non protein substances that bind to enzymes to produce activity
what is antioxidant?
substance able to neutralize reactive oxygen molecules and prevents damage
what is free radicals?
a type of highly reactive molecule that causes oxidative damage
what is beriberi?
thiamine deficiency disease causing weakness, nerve degeneration, and sometimes heart changes
what is neurotransmitter?
chemical substance produced by nerve cell that can stimulate/inhibit another cell
what is pellagra?
disease from niacin deficiency causing dermatitis, diarrhea, dementia, and death
what are neural tube defects?
abnormalities in brain/spinal cord, results from errors during prenatal development
what is folic acid?
easily absorbed form of vitamin folate used in dietary supplement and fortified foods
what is macrocytic anemia/megaloblastic anemia?
reduction in blood capacity to carry oxygen characterized by abnormally large immature/mature red blood cells
what is pernicious anemia?
- macrocytic anemia resulting from vitamin B12 deficiency
- deficieny occurs when dietary vitamin B12 can’t be absorbed due to lack of intrinsic factor
what is intrinsic factor?
protein produced in stomach needed for absorption of vitamin B12
what is atrophic gastritis?
inflammation of stomach lining results in reduced secretion of stomach acid, microbial overgrowth, reduction in production of intrinsic factor
what is scurvy?
vitamin C deficiency disease characterized by bleeding gums, tooth loss, joint pain, fatigue
what is retinoids?
chemical form of preformed vitamin a: retinol, retinal, retinoic acid
what is carotenoids?
natural pigments synthesized by plants and many microorganisms, giving yellow and red-orange fruits/vegetables colour
what is hypercarotenimia?
condition caused by accumulation of carotenoids in adipose tissue, causing skin to appear yellow/orange
what is parathyroid hormone?
hormone released by parathyroid gland acts to increase blood calcium levels
what is rickets?
vitamin D deficiency disease in children, characterized by poor bone development resulting from inadequate calcium absorption
what is osteomalacia?
vitamin D deficiency disease in adults, characterized by loss of mineral in bone, bone pain, muscle aches, increase in bone fractures
what is dehydration?
a state that occurs when not enough water is present to meet body’s needs
what is blood pressure?
amount of force exerted by blood in walls of arteries
what is water intoxication?
condition occurs when person drinks enough water to significantly lower sodium concentration in blood
what is minerals?
nutrition elements needed by body in small amounts to maintain structure and regulate chemical reactions and body processes
what is major minerals?
minerals required in diet in amounts greater than 100mg/day or present in body in amounts greater than 0.01% body weight
what is trace minerals?
minerals required in diet in amounts less than 100mg/day or present in body in amounts less than 0.01% body weight
what is cofactors?
inorganic ions/coenzymes required for enzyme activity
what is electrolytes?
positively/negatively charged ions that conduct an electrical current in solution, commonly refers to sodium, potassium, and chloride
what is hypertension?
blood pressure consistently elevated to 140/90mm Hg or greater
what is bone remodelling?
continuous process where small amounts of bone are removed and replaced by new bone
what is peak bone mass?
the max bone density attained at any time of life, usually occuring in young adulthood
what is osteoporosis?
bone disorder characterized by reduced bone mass, increased bone fragility, increased risk of fractures
what is menopause?
time in women’s life when menstrual cycle strops