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Unit 1. Life processes

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The document discusses the four main life processes of nutrition, digestion, respiration, and circulation. It explains that nutrition provides nutrients and energy through four processes: digestion in the stomach and intestines, respiration in the lungs, circulation through the heart and blood vessels, and excretion through the kidneys. It also covers the body's sensitivity through the sense organs, nervous system, and locomotor system.

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1. LIFE PROCESSES UNIT 1. NATURAL SCIENCE. 4TH GRADE
NUTRITION provides your body with all the nutrients and energy that are necessary for life.
NUTRITION Involves 4 processes: 1. DIGESTION 2. RESPIRATION 3. CIRCULATION 4. EXCRETION
DIGESTION Takes place in the digestive system DIGESTIVE SYSTEM: This system absorbs nutrients you need from food. MAIN ORGANS: STOMACH and INTESTINES.
RESPIRATION Takes place in the respiratory system when we breathe in air MAIN ORGANS: LUNGS
CIRCULATION Takes place in the circulatory system Moves the blood with oxygen and nutrients. MAIN ORGAN: HEART
EXCRETION Takes place in the excretory system. FUNCTION: Expels waste from the body. MAIN ORGANS: KIDNEYS
SENSITIVITY Ability to detect and respond to changes in the environment. It involves: 1. THE SENSE ORGANS 2. THE NERVOUS SYSTEMS 3. THE LOCOMOTOR SYSTEMS
THE SENSE ORGANS
THE NERVOUS SYSTEM Receives information from the sense organs. 1. Carry information from the sense organs to the brain 2. Carry orders from the brain to the locomotor system
Unit 1. Life processes
THE LOCOMOTOR SYSTEM allows us to move our body.
Bones meet at joints.
Unit 1. Life processes
Muscles are joined to bones by tendons.

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Unit 1. Life processes