SC8 #3 Digestive & Excretory System Flashcards Preview

Biology > SC8 #3 Digestive & Excretory System > Flashcards

Flashcards in SC8 #3 Digestive & Excretory System Deck (21):
1

What are the 5 nutrients necessary for your body?

carbohydrates, proteins, fats, vitamins and minerals

2

What are carbohydrates?

Quickest source of energy

3

What do proteins do?

Builds muscles, skin, hair and nails

4

What are fats and what do they do?

Stored energy, builds cell membranes

5

What do vitamins do?

Keeps body healthy and strong

6

What do minerals do?

Keeps body healthy and strong

7

What is the first step in the digestive system and what happens?

Ingestion: food is taken into the mouth

8

What is the second step in the digestive system and what happens?

Digestion: 1) teeth grind food and turns it into bolus
2) saliva mixes with bolus
3) bolus is pushed through the esophagus by peristalsis
4) in the stomach, bolus mixes with gastric juice and turns into chyme
5) chyme enters the first part of the small intestine (duodenum) where it breaks down by substances produced by liver and pancreas

9

What is bolus?

A small mass of substance

10

What is peristalsis?

Constriction and relaxation of the muscles of the intestine, makes wave-like movements

11

What is pepsin?

Enzyme that breaks down protein

12

What does HCI do?

Makes an acidic condition

13

What does mucus do?

Protects the stomach

14

What is the third step in the digestive system and what happens?

Absorbtion:
1) nutrients are absorbed in the rest of the small intestine
2) undigested food enters the large intestine where water and minerals are absorbed

15

What is villi?

Folds and increases surface area. Walls of small intestine are lined with villi

16

What is the final step in the digestive system and what happens?

Elimination: feces is stored in the rectum and leaves through the anus

17

What is feces?

Undigested food in the body

18

What are nutrients

Substances that supply energy

19

The part of the digestive system in which undigested material is eliminated includes the _____ & _____.

Rectum and anus

20

The part of the digestive system in which nutrients are absorbed includes the _____ & _____.

Small intestine and large intestine

21

The part of the digestive system that ingests food is the _____.

Mouth