SCIENCEUNIT 1

EXAM REVIEW

NUTRITIONWe need susbstances to live: water, food and oxygen.We also need to eliminate bad things: wastes and carbon dioxide.

VITAL FUNCTIONSHumans carry out three vital functions: INTERACTION

Our senses get information and we react to that information.

REPRODUCTIONHumans have babies.Humans are viviparous, they are born from their mother’s womb.

VITAL FUNCTIONSREPRODUCTION

Humans are viviparous, they are born from their mother’s womb.

Other animals are oviparous, they are born from eggs.

Most plants are born from seeds.

VITAL FUNCTIONSINTERACTION

Your senses get information and your body reacts to it.

Example:Your eyes see a ball coming to you. Your brain thinks what to do.

You cover your face with your hands.

VITAL FUNCTIONSNUTRITION

We need susbstances to live: water, food and oxygen.We also need to eliminate bad things: wastes and carbon dioxide.

To do this our body uses four system:

VITAL FUNCTIONSNUTRITIONDigestive system

Takes: nutrients from food.Expels: food wastes.

Respiratory systemTakes: oxygen.

Expels: carbon dioxide..

Circulatory systemTransports nutrients

and wastes around the body.

Excretory systemCleans the blood an elimimates wastes.

DIGESTIVE SYSTEM

It is the group of organs that transform food into nutrients.

DIGESTIVE SYSTEMORGANS

MOUTH-> it is the entrance of the digestive system.ESOPHAGUS-> connects the mouth and the stomach.STOMACH-> stores food and mixes it with gastric juices.SMALL INTESTINE-> it is the longest organ in your body.LARGE INTESTINE-> it is the organ where blood absorbs water.ANUS-> it is the end of the digestive system.

LIVER and PANCREAS-> produce gastric juices.

DIGESTIVE SYSTEMTHE MOUTH

TONGUEMixes food with saliva and identifies flavours. TEETH

Break food down into small pieces.

SALIVARY GLANDS

Produce saliva.

DIGESTIVE SYSTEMTEETH

Teeth have different shapes to do different functions:• Incisors cut the food.• Canines tear the food.• Premolars and molars crush the food.