Organization & Tissues Body Organization & Homeostasis

Introduction Levels of Organization in the Human Body –Atoms –Molecules –Organelles –Cells –Tissues –Organs –Organ Systems

Organelles Tiny “organs” found inside the cell Examples: Nucleus, Mitochondria, ER, Ribosome, Cytoplasm

Cells Basic unit of structure and function in a living thing. The human body contains about 100 trillion cells.

Tissues What is a tissue? Group of similar cells that perform the same function

Tissue There are FOUR basic types of tissues in your body. Muscular Tissue Nervous Tissue Connective Tissue Epithelial Tissue

Tissues in the Human Body TissueFunctionExample Muscle -Allows Movement Nervous Connective Epithelial

Tissues in the Human Body TissueFunctionExample Muscle -Allows Movement - Muscles -Stomach Wall Nervous Connective Epithelial

Tissues in the Human Body TissueFunctionExample Muscle -Allows Movement - Muscles -Stomach Wall Nervous - Allows you to see, think, feel -Carry messages throughout the body Connective Epithelial

Tissues in the Human Body TissueFunctionExample Muscle -Allows Movement - Muscles -Stomach Wall Nervous - Allows you to see, think, feel -Carry messages throughout the body - Spinal Cord -Brain-Nerves Connective Epithelial

Tissues in the Human Body TissueFunctionExample Muscle -Allows Movement - Muscles -Stomach Wall Nervous - Allows you to see, think, feel -Carry messages throughout the body - Spinal Cord -Brain-Nerves Connective -Body framework -Protects organs -Connect muscle and bone -Transport and store nutrients Epithelial

Tissues in the Human Body TissueFunctionExample Muscle -Allows Movement - Muscles -Stomach Wall Nervous - Allows you to see, think, feel -Carry messages throughout the body - Spinal Cord -Brain-Nerves Connective -Body framework -Protects organs -Connect muscle and bone -Transport and store nutrients -Red Blood Cells -Bones -Fat -Blood -Cartilage -Tendons Epithelial

Tissues in the Human Body TissueFunctionExample Muscle -Allows Movement - Muscles -Stomach Wall Nervous - Allows you to see, think, feel -Carry messages throughout the body - Spinal Cord -Brain-Nerves Connective -Body framework -Protects organs -Connect muscle and bone -Transport and store nutrients -Red Blood Cells -Bones -Fat -Blood -Cartilage -Tendons Epithelial -Protects (skin) -Absorbs nutrients -Filters kidneys

Tissues in the Human Body TissueFunctionExample Muscle -Allows Movement - Muscles -Stomach Wall Nervous - Allows you to see, think, feel -Carry messages throughout the body - Spinal Cord -Brain-Nerves Connective -Body framework -Protects organs -Connect muscle and bone -Transport and store nutrients -Red Blood Cells -Bones -Fat -Blood -Cartilage -Tendons Epithelial -Protects (skin) -Absorbs nutrients -Filters kidneys -Lining of Digestive Syst. -Lining of the Mouth -Skin

Organs & Organ Systems A structure that is made up of different kinds of tissues is an ORGAN Examples of Organs Stomach, Heart, Brain, Lungs

Body Organs An organ has a specific job that is more complex than that of a tissue. EXAMPLE: – The heart pumps blood throughout your body over and over. The heart contains all four types of tissue, all tissue types contribute to pumping the blood.

What is an organ system? Group of organs that work together to perform a major function.

Different organ systems work together and depend on one another. EXAMPLE: Riding a Bike - Use muscular and skeletal system to steer and push the pedals. - Use your nervous system to direct your arms and legs to move and balance. - Use your respiratory, digestive, and circulatory system to fuel your muscles with the energy they need. - Excretory system removes wastes produced while your muscles are hard at work.

All systems of the body work together to maintain HOMEOSTASIS. –The process by which an organism’s internal environment is kept stable in spite of changes in the external environment.

Homeostasis Example Body Temperature When you are hot… – –Sweat – –Hair lays flat – –Blood vessels widen near surface to release heat When you are cold… – –Body Shivers – –Hair stands up to trap heat – –Blood vessels constrict near surface to conserve heat