Carrying Out Life Processes EQ: How are life processes carried out by unicellular and multicellular organisms?

Life Processes A process is a series of steps taken to achieve an outcome. All organisms perform certain processes to obtain oxygen, obtain food, to remove wastes, and to grow. Photosynthesis, cellular respiration, diffusion, osmosis, mitosis are all life processes carried out by all organisms

Unicellular vs. Multicellular An organism can be defined as living being that shows all six of the characteristics of life. Growth, reproduction, responds to environment, uses energy, composed of cells, has DNA

Unicellular Organisms Some living organisms are made of one cell only, and are called unicellular. These organisms have a large surface area to volume ratio and rely on simple diffusion to meet their needs. All life processes are performed by the organelles within the cell

Unicellular Organisms An example of a unicellular organism is the paramecium. A paramecium is a small one celled living organism that has all six characteristics of living things and can carry out life processes.  Useful substances that the paramecium requires like oxygen passes into to the paramecium from the environment by diffusion and waste substances pass out into the environment also via diffusion.

Multicellular Organisms Multicellular organisms are those which are made up of many cells. Humans are multicellular. Multicellular organisms can be much larger and more complex. This is because the cells of the organism have specialized into many different types of cells such as nerve cells, blood cells, muscle cells all performing different functions.

Multicellular Organisms Furthermore, the specialized cells make up tissues, tissues make up organs, and organs make up organ systems.

Unicellular vs. Multicellular Simple body construction (single cell) All functions carried out by the organelles of the single cell    Does not achieve large size Short life span No cell specialization Tend to be microscopic Complex organization Specific functions for different cells Cell specialization, Can increase size by increasing the number of cells Longer life span Tend to be macroscopic (seen with naked eye)

Unicellular Multicellular

Card Sort Start 2 headings: Unicellular and Multicellular Look at the pictures and phrases Categorize each picture/phrase as either an example of a unicellular organism or a multicellular organism Place the picture/phrase under the correct category Call Mrs. Belaski over to check your work

Balancing The Systems EQ: How are life processes carried out by unicellular and multicellular organisms?

Systems A group of organs that work together and provide an organism with an advantage for survival is called a system.

Systems Systems are the most complex organizational level in your body. OCTOSO Systems are made of individual organs, such as the heart or lungs Systems work alone and with other systems to allow your body to maintain homeostasis

Examples of systems in the human body: Circulatory Skeletal Muscular Respiratory Digestive Excretory Integumentary Nervous Lymphatic Endocrine

Homeostasis https://www.youtube.com/watch?v=-W7kAyUQT0E Homeostasis is a stable internal environment that allows you (and your cells) to survive All of your body’s systems work together to maintain homeostasis inside your body

Homeostasis Homeostasis is achieved by making sure the temperature, ph (acidity), oxygen levels, and many other factors are set just right for your cells to survive.

Your systems must work together to achieve homeostasis All systems in an organism are interconnected. For example: the circulatory and respiratory systems As blood circulates through your body, it needs fresh oxygen from the air. When the blood reaches the lungs, part of the respiratory system, the blood is reoxygenated. https://www.youtube.com/watch?v=QKT47A-LBj4

Today’s task You will be placed in a small group and assigned an organ system. You are to use the packets provided to find the following information so that we may complete the graphic organizer on the board Major organs of the system The purpose/functions of the system How your system interacts with other systems Other critical information