Unit 5 - P1
Unit 5 – Anatomy and Physiology for Health and Social Care
Cells
Introduction
For this assignment I will have to talk about the organisation, e.g. cells, tissues, organs and systems. And the cells, e.g. cell membrane, nucleus, cytoplasm; organelles- mitochondria, smooth and rough endoplasmic reticulum, golgi apparatus and lysosome.
Organisation; Every individual is composed of billions of microscopic units called cells. The cells carry out vast numbers of chemical reactions and processes that make up the essence of life itself. Cells rarely exist in isolation; they are usually grouped together with other similar cells carrying out particular tasks. Groups of cells are known as tissues. Different types of tissues are commonly grouped together to form an organ, which carries out a particular function. Finally, groups of organs that are responsible for major tasks or functions in the body are called organ systems or sometimes body systems.
Cells; The largest cell in the human body is the female ovum, which can be seen with the naked eye. Most cells are much smaller than this, and microscopes are required to see them. Ordinary light microscopes, such as those you may find in school or college laboratories, are quite good for seeing tissues and organs, but are not that useful for looking into the inside of an individual human cells. An electron microscope is a very powerful type of microscope that is needed to look inside cells, and is necessary to see the detail of cell contents. However, as these are highly expensive instruments requiring trained operators to prepare and interpret the specimens, we use diagrams and photomicrographs (a photograph taken of an object magnified under a microscope) instead. Details of the interior of a cell are often referred to as the ultra structure of the cell. This is because they can only be seen with immense magnification. Before the electron microscope was developed, the inside of a cell was considered to be a granular
Cells
Introduction
For this assignment I will have to talk about the organisation, e.g. cells, tissues, organs and systems. And the cells, e.g. cell membrane, nucleus, cytoplasm; organelles- mitochondria, smooth and rough endoplasmic reticulum, golgi apparatus and lysosome.
Organisation; Every individual is composed of billions of microscopic units called cells. The cells carry out vast numbers of chemical reactions and processes that make up the essence of life itself. Cells rarely exist in isolation; they are usually grouped together with other similar cells carrying out particular tasks. Groups of cells are known as tissues. Different types of tissues are commonly grouped together to form an organ, which carries out a particular function. Finally, groups of organs that are responsible for major tasks or functions in the body are called organ systems or sometimes body systems.
Cells; The largest cell in the human body is the female ovum, which can be seen with the naked eye. Most cells are much smaller than this, and microscopes are required to see them. Ordinary light microscopes, such as those you may find in school or college laboratories, are quite good for seeing tissues and organs, but are not that useful for looking into the inside of an individual human cells. An electron microscope is a very powerful type of microscope that is needed to look inside cells, and is necessary to see the detail of cell contents. However, as these are highly expensive instruments requiring trained operators to prepare and interpret the specimens, we use diagrams and photomicrographs (a photograph taken of an object magnified under a microscope) instead. Details of the interior of a cell are often referred to as the ultra structure of the cell. This is because they can only be seen with immense magnification. Before the electron microscope was developed, the inside of a cell was considered to be a granular