A cell is the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic.
Plant and Animal Cells
Plant and animal cells are all cells. Although, the overall function of the cell is the same, there are some important differences between animal and plant cells. The primary difference is that plant cells have an organelle called chloroplast. Chloroplasts contain a pigment called chlorophyll.
The cells in your muscles are know nas muscle cells. Muscle cells contain protein filaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. Muscles function to produce force and motion.
Your nervous system contains millions of nerve cells, called neurons. Neurons are highly specialised to transmit messages from one part of your body to another. All neurons have a cell body and one or more fibres. These neurons are responsible for all physical feeling in your body and some may say it is also responsible for your emotional feeling.
Bone Cells or Osteogenic Cells are the cells that make up your bones. They are the only bone cells that can divide. Osteogenic Cells differentiate and develop into osteoblasts which, in turn, are responsible for forming new bone. Also, Osteogenic Cells synthesize and secrete a collagen matrix and calcium salts.
The respiratory system is a biological system consisting of specific organs and structures used for the process of respiration in an organism.
The function of the digestive system is digestion and absorption. Digestion is the breakdown of food into small molecules, which are then absorbed into the body. The digestive system is divided into two major parts: The digestive tract (alimentary canal) is a continuous tube with two openings: the mouth and the anus.