Organization and Growth in Living Things PDF

Organization and Growth in Living Things  These levels The human work body is together to organized keep us Introduct...

Organization and Growth in Living Things  These levels The human work body is together to organized keep us Introductio into different levels alive and n to Body healthy Organizatio We'll also n We'll explore how our learn about how bodies are organisms structured grow and reproduce   Cells: The smallest living units  Tissues: Groups of similar cells working together Levels of  Organs: Different tissues combining to Organizatio perform specific functions n  Organ Systems: Groups of organs working together  Organism: The complete living being (you!)  Cells are the basic units of life Cells: Different types of cells Red blood cells carry The have different jobs oxygen Building Examples: Nerve cells Blocks send signals Cells divide to Muscle cells make more of help us move themselves  Four main types of tissues: Tissues are groups of Epithelial: Covers surfaces (skin, lining of similar cells working organs) together Connective: Supports and connects (bones, tendons) Muscle: Allows movement Nervous: Sends and receives signals Tissues: Teamwork in Action   Organs are made of different tissues Organs: working together Specialize  Each organ has a specific job d  Examples:  Structure Heart: Pumps blood  Lungs: Exchange oxygen and carbon dioxide s  Brain: Controls body functions and thoughts  Stomach: Helps digest food Organ Systems: Cooperation is Key  Organ systems are groups of organs working together  Examples:  Digestive system: Breaks down food for energy  Respiratory system: Brings oxygen into the body  Circulatory system: Transports blood and nutrients  Nervous system: Controls and coordinates body functions   Growth is an increase in size and complexity  In humans, growth happens throughout Organis childhood and adolescence m  Growth involves:  Cell division (making more cells) Growth  Cell enlargement (cells getting bigger)  Differentiation (cells becoming specialized)  Hormones play a big role in growth, especially during puberty Reproduction: Making New Organisms  Reproduction is how organisms create offspring  Two main types:  Asexual reproduction:  One parent  Offspring are identical to parent  Examples: Some bacteria, starfish  Sexual reproduction:  Two parents  Offspring have traits from both parents  Humans reproduce sexually  The cell cycle is how Growth cells grow and divide The Cell Stages of the cell DNA replication cycle: Cycle and Mitosis creates two identical daughter Mitosis (cell division) Mitosis cells Important for growth, repair, and asexual reproduction The human body is organized in Each level has specific functions Growth involves increase in size Review levels: cells, tissues, organs, systems and works with others and complexity and Conclusi on Reproduction Understanding these allows organisms concepts helps us to create offspring appreciate how amazing our bodies are!