Digestive system Flashcards

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1
Q

DIGESTIVE SYSTEM

A

the alimentary canal along with other digestive organs is known as the digestive system

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2
Q

STEPS IN NUTRITION

A
ingestion
digestion
absorption 
assimilation
excretion
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3
Q

digestion in higher organisms

A

specialised organs are present for digestion

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4
Q

digestion in single-celled organisms

A

all the steps take place in a single cell. eg amoeba

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5
Q

INGESTION

A

process of taking in food. occurs through the mouth in humans

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6
Q

DIGESTION

A

breakdown of complex food particles into simple molecules with help of enzymes.

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7
Q

WHAT ARE ENZYMES?

A

special molecules which help in the breakdown of food into simpler molecules during digestion.

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8
Q

ABSORPTION

A

the process by which digested food passes through the walls of the intestine and enters the blood

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9
Q

ASSIMILATION

A

the utilisation of absorbed food by the body for energy growth and repair

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10
Q

the absorbed food is carried to all parts of the body by

A

blood

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11
Q

EGESTION

A

the process of removal of undigested food from the body. in humans it occurs through the anus

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12
Q

TEETH

A

hard structures present in the mouth cavity specialised for holding prey and breaking food.

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13
Q

DENTITION

A

arrangement of teeth in the jaw

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14
Q

TYPES OF DENTITION

A

heterodont- all teeth have the same shape and size. eg. fish, reptiles, amphibians.
homodont- teeth are or different shapes and sizes. eg. humans, mammals.

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15
Q

TYPES OF TEETH AND FUNCTION & NO.

A
  1. incisors- 4- cutting and biting
  2. canines-2- tearing
  3. premolars- 4- chewing and grinding
  4. molars-6- chewing and grinding
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16
Q

STRUCTURE OF TOOTH

A
  1. crown- the part of the tooth above the gum
  2. neck- part of the tooth level to the gum
  3. root- part buried in the gum
17
Q

ENAMEL

A

the white part of the tooth which is the hardest substance present in the body.
contains calcium salts

18
Q

DENTINE

A

solid tissue present inside the enamel. contains strands of cytoplasm passing through it

19
Q

PULP CAVITY

A

CAVITY CONTAINING BLOOD CAPPULARIES AND NERVES ENCLOSED IN THE DENTINE.

20
Q

CEMENT

A

the thin layer of bonelike material covering the dentine. hold the tooth firmly in the jaw.

21
Q

ORGANS OF THE DIGESTIVE SYSTEM

A
  1. mouth
  2. oesophagus
  3. stomach
  4. small intestine
  5. large intestine
  6. anus