Biology Exam Digestive System Complete Questions And Answers Guaranteed Pass.
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Course
DIGESTION
Institution
DIGESTION
What is the role of the digestive system? - correct answer Getting nutrients into the body and secreting undigested material.
Describe the mucosa. - correct answer The innermost layer that nutrients pass through of the gas...
What is the role of the digestive system? - correct answer Getting nutrients into the
body and secreting undigested material.
Describe the mucosa. - correct answer The innermost layer that nutrients pass
through of the gastrointestinal (GI) tract layers
What is peristalsis? What layer of the GI tract
allow for it? - correct answer Propels food forward. Begins with a lump of food and
stretches portions of the GI tract, causing smooth muscle in front of bolus to relax and the muscle
behind it to contract. Contraction push food forward. Muscularis layer of GI tract allows it.
List and describe the 5 processes of digestion. - correct answer Mechanical
processing and movement: chewing and mixing
Secretion: Fluid, Digestive enzymes and hormones
Bile, acid, alkali, mucus
Digestion: Breaking down food to smallest absorbable units
Absorption: Through mucosa, Into blood or lymph vessels
Elimination: Undigested material eliminated
What structures begin digestion? What structures
end digestion? - correct answer The mouth begins digestion:
Why don't I get food in my lungs and air in my
stomach? - correct answer The Epiglottis keeps the trachea closed when swallowing
so food goes into the esophagus and into the stomach,
What is gastric juice, where is it produced, what is
, its role? - correct answer Gastric Pits lead to gastric glands below the surface of
mucosal layer of stomach. Pepsinogen, Hydrochloric acid (mucus), and fluid that are secreted into glands
are known as gastric juice. Give stomch pH approx 2. Dissolve connective tissue in foods and digest
proteins and peptides into amino acids so they can be absorbed in small intestines.
Hydrochloric acid: Produces a pH of about 2; breaks down large bits of food
Intrinsic factor: Made by same cells that make acid; needed to absorb vitamin B12
Mucus: Protects stomach lining from acid
Pepsinogen: With acid, begins protein breakdown as pepsin
Which part of the digestive system absorbs
nutrients? - correct answer Small Intestines
Which part of the digestive system absorbs water? - correct answer Large Intestines
What is heartburn? - correct answer Lower esphageal sphincter at base of
esophagus opens briefly as food arrives and closes after it passes into stomach. Prevents stomach
content's back into the esophagus. When malfunctions results in acidic stomach fluid into esophagus
known as acid reflux that causes burning sensation (heartburn)
How are the villi of the intestines like the brain,
mitochondria, and aveoli in the lungs? - correct answer Large folds increase the
suface area by more than 500 times which increases ability absorb nutrients, At center of each villi, are
capillaries and small lymph vessel called lacteal which transport nutrients to larger blood vessels and
lymph vessels.
What is the role of the Pancreas? the liver? - correct answer Pancreas: Exocrine
functions, Secretes digestive enzymes and sodium bicarbonate
Liver: Produces bile, Hepatic portal system, Drains blood from the digestive tract to the liver, Metabolic
functions
Storage, synthesis, and chemical processing
What's the difference between an amino acid and
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