SCIENCEUNIT 2

ANIMALS

• The Characteristics of animalsAnimals are multicellular organisms.They are consumers. This means they feed on other living things. Their cells group together as tissues which form organs and systems.

• The nutrition function in animalsThere are four processes:- The taking and digesting of food.- The taking of oxygen.- The distribution of sustances.- The excretion os residues.

For digestion most animals have a digestive system.The simplest is a digestive cavity. Most have a digestive tract.They have different organs, like the stomach and the intestines.

• The interaction function in animalsAnimals have sense organs, or receptors, which detect stimuli.Animals have a nervous system which processes information from the receptors, elaborates a response and sends instructions to the effectors.The effectors execute the instructions of the nervous system.

Lesson vocabularyConsumer: consumidorTo feed: alimentarseTo take: tomarTo digest: digerirTo distribuit: distribuirCavity: cavidadReceptors: receptoresStimuli: estímuloTo elaborate: elaborarResponse: respuestaTo send: enviarEffector:efectorInstruction: instrucción