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Bio 431 Unit 3 Exam Questions and Answers Latest Update
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Bio 431 Unit 3 Exam Questions and Answers Latest Update
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Bio 431 Unit 3 Exam Questions andAnswers Latest Update
Name the 5 steps in the Digestive Process - Answer-1. Ingestion
2. Propulsion
3. Digestion
4. Absorption
5. Defecation
Explain the difference between Mechanical digestion and chemical digestion. - Answer-
Mechanical: Chew to break down
Chemical: enzymes / acid used to break down
Explain the difference between Peristalsis vs. Segmentation - Answer-Peristalsis:
constant movement of contracting and releasing tract organs to move food down
Segmentation: alternately contracting and relaxing to mix the food around forward and
backward.
Explain the difference between visceral and parietal Peritoneum - Answer-Serosa lining
Visceral: touching organ
Parietal: touching wall
What is Mesentery? Name 4 examples talked about in lecture - Answer-Mesentery: Part
of Peritoneum that connects tubes to organs
1. Mesocolon
2. Lesser omentum
3. Greater omentum
4. Falciform liggament
4 basic layers of the Alimentary Canal and their function - Answer-1. Mucosa:
- Epithelium, lamina propria, muscularis mucosae
2. Submucosa:
- CT , submucosal nerve plexus (ANS) (parasympathetic)
3. Muscularis Externa:
- inner circular, outer longitudinal, myenteric pleus (ANS) (parasympathetic) , sphincters
4. Adventitia or Serosa:
- outter protective layer
Name the difference between Taste Buds and Papillae. - Answer-Papillae are bumps
that give texture
Taste buds give us the 5 flavors (sweet, sour, bitter, salty, and umame)
Name the 4 types of papillae - Answer-1. Filiform
- no taste buds / gives tongue texture
, 2. Fugiform
- 5 taste flavors / front of tongue
3. Circumvallate
- 8-2 bumps/ back of tongue
4. Foliate papillae
- Gills on the side of tongue
What is the function Salivary Glands? - Answer--Cleanse the mouth, moisten
-dissolved food chemicals
-aids in bolus formation
-contains enzymes to break down starch
Name the intrinsic and extrinsic salivary glands describe how they are regulate and
control saliva differently. - Answer-Intrinsic: keep mouth moist / constantly releasing
saliva
- buccal glands
Extrinsic: releases saliva at the thought, taste, or smell of food
- parotid glands
-Submandibular glands
-Sublingual glands
What is the Composition of Saliva - Answer-97-99.5 % water , slightly acidic ,
electrolytes
What is Deglutition and name the 2 phases - Answer-"Swallowing"
-Buccal phase: voluntary
-Pharyngeal-esophageal phase: involuntary
What is the function of the Stomach (temporary Storage tank) - Answer-Mixes and
stores food converting them to chyme
Name the 4 regions of the stomach. - Answer-1. Cardia
2. Fundus
3. Body
4. Pylorus
What type of cells are on the mucosa gastric surface? - Answer-Mucus cap cells:
(bicarbonate- rich mucus) protective stomach layer
Name 4 different gastric glands, what they secrete and the function. - Answer-1. Mucus
neck cells:
- secrete mucus , forms lining
2. Parietal Cells
- hydrochloric acid (HCL) to denature carbohydrate protiens
- Intrinsic Factor secretes vitamin B12 and helps absorb
3. Chief cells
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