University:
University of North Carolina at Chapel Hill
Course:
NURS 211 | Anatomy and Physiology
Academic year:

2024
Views:

211

Pages:

2
Author:

Amelia R.

Amelia Roses (UNC20215678) Bachelor of Science in Nursing LECTURE NOTES OF ORGANISM: A UNITY OF ALL LEVELS OF ORGANIZATION An organism is a complex system built from various levels of organization, ranging from the cellular level to the whole organism itself. Each level has its own structure and function, and all these levels interact and collaborate to ensure the organism's survival. Levels of Organization in Life: 1. Cell:The fundamental unit of life that can carry out all life functions. Cells consist of different organelles, such as the cell membrane, nucleus, mitochondria, and ribosomes, each with a specific job. 2. Tissue:A group of cells with similar structure and function. Examples of tissues in the human body include epithelial tissue, connective tissue, muscle tissue, and nervous tissue. 3. Organ:A group of tissues working together to perform a specific function. Examples of organs in the human body include the heart, lungs, stomach, and brain. 4. Organ System:A group of organs working together to carry out a more complex function. Examples of organ systems in the human body include the digestive system, respiratory system, circulatory system, and nervous system. 5. Organism:The unity of all levels of life's organization, capable of living, growing, and reproducing. Relationships Between Levels of Organization: 1. Each level is built from the level below it. 2. Each level has its own unique structure and function. 3. All levels interact and cooperate to maintain the organism's life. Examples of Relationships Between Levels in the Human Body: 1. Red blood cells within blood tissue (connective tissue) transport oxygen throughout the body (organism). 2. The heart (organ) pumps blood (connective tissue) containing oxygen and nutrients throughout the body (organism). 3. The digestive system (organ system) breaks down food and absorbs nutrients needed by the body (organism). An organism represents the unity of all levels of life's organization. Each level possesses its own structure and function, and all these levels cooperate to ensure the organism's survival. Understanding the connections between these levels is crucial for grasping how the human body functions as a whole.