Exam 1 Flashcards
Salivary ______ begins breakdown of carbohydrates
Amylase
______ glands releases mixture of water, mucus, enzymes, and antibacterial agents
Salivary
Digestive enzymes are specific to what class of nutrients?
Macronutrients
Define absorption
The process of taking smaller molecules through intestinal cells into the bloodstream
Hepatic portal circulation:
Transports water-soluble nutrients from small intestine to the liver
Name a water soluble vitamin
Vitamin C
Lymphatic circulation:
Transports lipids and fat-soluble vitamins from the small intestine to the lymphatic system
Cell membrane provides a boundary between _______ and ________ environments
Extracellular, intracellular
Define selectively permeable
Controls movement into and out of cells
Define elimination
Process of removing undigested food and particles from body
Colon:
Form, store, eliminate feces
Normal feces contain what percentage of water and solids?
75% water, 25% solids
Define oral cavity
Mechanical breakdown, moistening, and mixing of food with saliva
What percentage of taste does olfactory cells account for taste?
80%
What does saliva assist with?
Swallowing and taste sensation
Dysphagia affects how people ______
Swallow
What is the fourth leading cause of unintentional injury death?
Choking
Does digestion occur in the esophagus?
No
What moves food through esophagus to stomach?
Peristalsis
List three main functions of stomach:
Temporary storage, production of gastric secretions needed for digestion, mixing of food with gastric secretions
The Fundus is the _____ portion of the stomach
Top
The _____ is the middle portion of the stomach
Body
What’s the name of the lower portion of the stomach?
Antrum
Define sphincter
Muscular valve that controls flow in the GI tract
The gastroesophageal sphincter is also known as what?
Lower esophageal sphincter
The gastroesophageal sphincter separates the _______ from the ________
Esophagus, stomach
GERD stand for:
Gastroesophageal reflux disease
Define nutrition
the science that links foods to health and disease
List the three most important factors determining our food choices
flavor, texture, and appearance
Routines and ______ are tied to some food choices
habits
What is a major media tool for capturing food interest of the consumer?
marketing and advertising
Is restaurant food healthy and why/why not?
no, they are calorie-dense, served in large portions, and of poorer nutritional quality
What two factors have become significant influences affecting food choices?
time and convenience
define hunger
physical internal drive to find and eat food
define appetite
the psychological external influence that encourages us to find and eat food, in the absence of hunger
define satiety
state of no desire to eat, a feeling of satisfaction
nutrients come from _____
food
list the three characteristics of an essential nutrient
has a biological function, omission results in the decline of function, replenishing restore biological function
What is the second leading cause of preventable death in the United States?
obesity
Poor _____ and _______ lifestyle are risk factors for chronic diseases
diet, sedentary
what is the first leading cause of death?
heart disease
what is an example of a nonmodifiable risk factor?
family history
list examples of modifiable risk factors
smoking, alcohol consumption, poor dietary habits, stress, poor sleep
obesity is the excessive amount of body fat relative to _______ tissue
lean
percent of adults aged 20 and over with obesity:
39.8%
percent of adults aged 20 and over with overweight, including obesity:
71.6%
the health cost of obesity in the united states is estimated to be as high as what amount of money annually?
$147 billion
are there good and bad foods?
no
hypertension:
blood pressure constantly elevated
diabetes:
a group of diseases characterized by high blood glucose
type 1 diabetes:
insufficient or no release of insulin by the pancreas and requires daily insulin therapy
this type of diabetes results from insufficient release of insulin or the inability of insulin to act on body cells; usually does not require insulin therapy
type 2
list the six classes of nutrients
carbohydrates, lipids, proteins, vitamins, minerals, water
define macronutrients and what the three macronutrients are
provides calories—needed in gram quantities in a diet. carbohydrates, proteins, and lipids/fat
carbohydrates provide _______ of calories in our diet
majority
what two simple sugars are examples of carbs?
monosaccharides and disaccharides
list the three examples of complex carbs
glycogen, starch, fiber
how many calories per gram do carbs provide?
4
are lipids/fats energy yielding?
yes
are proteins energy yielding?
yes
how many calories per gram does fat provide?
9
are proteins the main structural material in the body?
yes
when do proteins form?
when amino acids are bonded together
do micronutrients provide calories?
no
what are the names of the two micronutrients?
vitamins and minerals
what is the name of the nutrient that enables chemical reactions?
vitamins
which vitamins are fat soluble?
A, D, E, K
Vitamins B and C are ____ soluble
water
cooking destroys ______ soluble more readily than _____ soluble
water, fat
do vitamins contain useable energy?
no
_____ are inorganic substances that do not contain carbon atoms
minerals
minerals perform ________ functions
electrolyte
true or false: minerals provide no calories/energy
true
what is the recommended intake of water per day?
9-13 cups
water acts as a ____ and a lubricant
solvent
what do phytochemicals do?
reduce risk of cancer and cardiovascular disease
alcohol provides ____ kcal per gram and is not considered an _______ nutrient
7, essential
anthropos =
human
metric =
measures
define anthropometry
the scientific study of the measurements and proportions of the human body
a person with a BMI of less than 18.5 is considered:
underweight
a healthy weight BMI range is what range?
18.5-24.9
overweight BMI range is 25-___
29.9
obesity BMI range is ___-39.9
30
morbid obesity is a BMI greater than ___
40
does BMI directly reflect body fat percentage?
no
true or false: BMI measures body composition
no
what two factors are needed to calculate BMI?
height and weight
people who have a ______ amount of lean mass relative to _____ mass might be considered ______ by BMI standards
high, fat, obese
true or false: the apple shape body fat distribution is healthier than the pear shape
false
list the waist circumferences for men and women to be classified as having an apple shape
greater than 40” for men, greater than 35” for women
Rugae is the specialized lining of the _______
Stomach
The stomach can expand to what range of quarts?
One to two
Gastric stimulates the _________ cells to release hydrochloric acid
Parietal
Gastrin stimulates the chief cells to release _______ enzymes specific to fat and protein
Digestive
Gastric lipase is a _______ enzyme in the stomach
Digestive
Pepsin is a digestive enzyme that digests _________
Proteins
Define chyme
A soupy cream of wheat textured substance in the stomach
Chyme slowly passes through the ________ sphincter
Pyloric
What protects the stomach from its harsh acidic environment?
A gastric mucosal layer
Gastroesophageal reflux disease (GERD) is due to the _________ of acidic chyme
Backflow
Gastroparesis is a disease in which what?
The stomach cannot empty itself of food in a normal fashion
What are peptic ulcers?
Areas of the GI tract that have been eroded by hydrochloric acid and pepsin
What is the primary cause of ulcers?
A small spiral-shaped bacterium called Helicobacter pylori burrows itself into thick mucus layer exposing the underlying stomach layers to acidic gastric juice
What is the primary site for chemical digestion and absorption?
The small intestine
How long is the small intestine?
20 feet
The duodenum is the _______ segment of the small intestine
First
The middle segment of the small intestine is the _________
jejunum
What’s the name of the last segment of the small intestine?
Ileum
What are microvilli?
Hair-like projections on luminal surface of the enterocytes
What is the brush border?
The absorptive surface of the small intestine made up of thousands of microvilli
Which type of circulation is responsible for water soluble nutrients, glucose, and amino acids?
Hepatic portal circulation