Characteristics of Living Things

Characteristics of Living Things… Made up of cells Metabolism Respiration, Nutrition, Digestion, Excretion Circulation Definite form and size Growth Locomotion Response to stimuli Adaptation to change Reproduction Definite life span

Big things are often made up of smaller parts

little peices Different kinds of little peices or units make up different parts of a whole

Living things are made up of cells light microscopescanning electron microscope

Cells  Tissues  Organs  Systems Cell: Osteocyte (student) Tissue: Bone tissue (class) Organ: Bone (grade) Organ system: Skeletal system (school)

Metabolism: Respiration

Cells need oxygen and energy Cells take oxygen (O 2 ) from their surrounding Cells also take glucose (C 6 H 12 O 6 ) from their surrounding Cells release carbon dioxyde (CO 2 ) into their surrounding and ENERGY This process is called Respiration O 2 + C 6 H 12 O 6 CO 2 + H 2 O + energy

Because of cellular respiration, excretion. living organisms give off waste products through a process called excretion. O2O2 C 6 H 12 O 6 CO 2

Because each and every cell in an organism depends on respiration and excretion, circulation That organism must have some sort of circulation system in place to bring each cell what it needs, and carry away its waste products Delivery Pickup

excretion When an organism is at rest, it needs less energy. Therefore its metabolism, (respiration and excretion) and circulation are slow.

When an organism is at work, it needs more energy. excretion Therefore its metabolism, (respiration and excretion) and circulation are fast.

Each kind of living thing has a definite size and shape which helps us recognise it.

All living things grow in size, and repair or replace worn out cells in the body

Living things move (at least parts of their bodies) around by themselves,

Living things react to things in their surrounding and adapt to change X

Living things grow for a certain time, reproduce, make sure their young survive, grow old and then die.

Review: Why Not? 1) Is everything in this picture that moves alive? 3) Ice melts when it is taken out of the freezer, as it reacts to changes in its environment. Why don’t we say the ice is alive? 2) The print on a page can be reproduced by a photocopying machine. Why don’t we say the machine is alive?