Chapter 17: Digestive System Flashcards

1
Q

digestion

A

mechanical & chemical breakdown of foods into forms that cell membranes can absorb; two types

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2
Q

digestive system

A

organs of digestive system carry out mechanical & chemical digestion, as well as ingestion, propulsion, absorption, & defacation

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3
Q

2 portions of digestive system

A
  • alimentary canal
  • accessory organs
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4
Q

alimentary canal

A

organs that extend from mouth to anus; food passageway

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5
Q

accessory organs

A

organs that empty secretions into alimentary canal; food does not pass through

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6
Q

how long is alimentary canal?

A

about 8m long; muscular tube

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7
Q

layers of alimentary canal (4)

A
  1. mucosa (inner)
  2. submucosa
  3. muscularis
  4. serosa
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8
Q

mucosa

A

epithelium, connective tissue, smooth muscle; protection, secretion, absorption

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9
Q

submucosa

A

loose connective tissue, blood vessels, lymphatic vessels, nerves; nourishes surrounding tissues, transports absorbed materials

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10
Q

muscularis

A

smooth muscle cells in circular & longitudinal groups; movements of tube & its contents

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11
Q

serosa (outer)

A

epithelium, connective tissue; protection, lubrication

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12
Q

where are all 4 layers of the alimentary canal able to be seen?

A

small intestine

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13
Q

2 types of movement in the alimentary canal

A
  • mixing
  • propelling
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14
Q

mixing movement

A
  • muscles in small sections contract rhythmically
  • does not move material in one direction
  • important to chemical digestion, stomach
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15
Q

propelling movement

A
  • moves materials in one direction
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16
Q

mixing is also referred to as…

A

segmentation

17
Q

propelling is also referred as…

A

peristalsis

18
Q

what helps innervate the alimentary canal?

A

branches of the sympathetic and parasympathetic divisions of ANS

19
Q

submucosal plexus

A

controls secretions

20
Q

myenteric plexus

A

controls motility

21
Q

parasympathetic impulses

A

increase activities of digestive system

22
Q

sympathetic impulses

A

inhibit digestive actions

23
Q

mouth

A
  • mastication
  • functions as organ of speech & sensory reception
  • surrounded by lips, cheeks, tongue, palate
  • includes oral cavity and vestibule
24
Q

salivary amylase

A

begins chemical digestion of carbs

25
Q

cheeks

A

contain muscles for chewing & facial expression; inner lining of stratified squamous (moist)

26
Q

lips

A

sensory receptors judge temp and texture of food; boundary between skin & mucous membrane inside mouth

27
Q

parts of tongue (3)

A
  • lingual frenulum
  • papillae
  • lingual tonsils
28
Q

lingual frenulum

A

connects tongue to floor of mouth

29
Q

papillae

A

projections that move food, contain taste buds

30
Q

lingual tonsils

A

lymphatic tissue masses on root of tongue

31
Q

palate

A
  • consists of hard & soft
  • uvula extends from the soft palate
32
Q

palatine tonsils

A

lymphatic masses on sides of tongue

33
Q

pharyngeal tonsils

A

adenoids; lymphatic tissue on posterior wall of pharynx

34
Q

teeth

A

20 primary (deciduous)
32 secondary (permanent)

35
Q

salivary glands

A
  • secrete saliva
  • moisten food particles & bind them together
  • dissolves food so it can be tasted
  • saliva contains enzymes and bicarbonate ions
36
Q

3 pairs of major salivary glands

A
  • parotid
  • sublingual
  • submandibular
37
Q

cavity

A

dental caries

38
Q

gomphosis

A

joint where teeth interlock