science unit 1 review
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SCIENCEUNIT 1
EXAM REVIEW
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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.
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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.
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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.
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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:
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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.
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DIGESTIVE SYSTEM
It is the group of organs that transform food into nutrients.
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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.
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DIGESTIVE SYSTEMTHE MOUTH
TONGUEMixes food with saliva and identifies flavours. TEETH
Break food down into small pieces.
SALIVARY GLANDS
Produce saliva.
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DIGESTIVE SYSTEMTEETH
Teeth have different shapes to do different functions:• Incisors cut the food.• Canines tear the food.• Premolars and molars crush the food.