Level of Organisation (2a)

Unit 2, Structure and Functions in Living Organisms: Part 1, a

Organelles

• specialised structures within a cell that carry out specific functions

• ex: Mitochondria

Cell

Basic structural and functional units of all organisms

Tissues

A group of cells that work together to perform a specific function

Organs

A structure made of different tissues working together to perform a specific function

Organ Systems

A group of organs working together to carry out a particular function

Organ Systems in Plant

• Shoot system

• Root system

Organ Systems in Animals

• Digestive system

• Circulatory system

• Respiratory system

• Excretory system

• Nervous system

• Reproductive system

Shoot System

Organs

• Leaf

• Stem

• Flower

• Fruit

Tissues

• Epidermis mesophyll

• Xylem

• Phloem

Root System

Organs

• Root

• Tuber

Tissues

• Ground tissue

• Xylem

• Phloem

Digestive System

Organs

• Oesophagus

• Stomach

• Small intestine

• Large intestine

Tissues

• Muscle

• Connective

• Epithelial

• Nerve

Circulatory System

Organs

• Heart

• Veins

• Arteries

Tissues

• Muscle

• Connective

• Epithelial

• Nerve

Respiratory System

Organs

• Trachea

• Lungs

Tissues

• Muscle

• Connective

• Epithelial

Excretory System

Organs

• Lungs

• Kidneys

• Skin

Tissues

• Muscle

• Connective

• Epithelial

• Nerve

Nervous System

Organs

• Brain

• Spinal Cord

Tissues

• Nerve

Organs

• Ovary

• Uterus

• Testes

Tissues

• Muscle

• Connective

• Nerve