We will begin this unit by learning about cells – the building blocks of living organisms. We will see how some organisms are able to live as a single cell, while others are composed of many cells. In multicellular organisms, cells connect together to make up tissues and organs, which form different body systems.
Cells are the building blocks of all living things. Some organisms can exist as a single cell that carries out all life functions, but other organisms are made of many specialized cells. These cells combine to make layers of tissue, which make up organs, which make up organ systems, which work together to carry out the life processes of a multicellular organism.
The circulatory and respiratory systems work together to provide oxygen to our body’s cells through the process of respiration. The lungs work to take in oxygen from the air, which is passed into our blood. As the heart circulates our blood, individual blood cells deliver oxygen to all the cells in our body.
As part of our study of the circulatory system, our students make models of the different components of human blood. Our blood is made of different types of cells including red blood cells, white blood cells, plasma, and platelets.
The digestive system breaks food down into nutrients that can be used to provide energy for our bodies. During the process of digestion, food travels through the mouth, esophagus, stomach, small intestine, and large intestine. at each stage of digestion, mechanical and chemical digestion take place until any remaining non-digestible parts of the food are removed from our body as waste.
The skeletal system provides shape, support, and protection for our bodies. Our muscles work with the skeletal system to allow our bodies to move. Other smooth muscles help with other body functions such as digestion and respiration.
The nervous system works to send signals to and from the brain which acts as the control system for our body. The nervous system is made up the brain, spinal cord, and nerves which work like electrical wiring for our bodies, sending and receiving tiny electrical signals.
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