in 300 words 1. In the human body there are approximately 200 types of cells. Co
ID: 168561 • Letter: I
Question
in 300 words 1. In the human body there are approximately 200 types of cells. Compare the structures between two different types of somatic cells (of your choosing) and a stem cell.
2. Write a paragraph that explains three directional terms OR regional names so that a friend that does not have a background in anatomy could understand. You need to first explain to this friend why anatomical terms are used in place of "common language.”
References are expected for all posts so research is also expected. APA formatting Thanks!
Explanation / Answer
1.
Cells are smallest units of a living organism. A cell is surrounded with plasma membrane composed of lipids and proteins. The cell contains a nucleus and other organelles. Different types of cells are organized into a tissue.
A cell normally measures to a size of micrometer or one millionth of a meter (10-6) or 1000th of a millimeter (10-3). The human eye can see the objects of size 100µm. Some human cells such as egg cells and fat cells are about 10 - 15µm wide. The longest human cells are nerve cells and muscle cells measuring over a meter or up to 30cm long respectively.
The cells occurring in the epithelium and its extra cellular material appear like a bricks and mortar of a wall. The extra cellular material is very thin and is barely visible under microscope. Therefore, the cells appear pressed tightly and closely together.
Blood contains the cells like red blood cells or erythrocytes that are small, biconcave, disc shaped cells, and they lack the nucleus. The white blood cells (WBC) are larger than erythrocytes and contain a nucleus.
The nervous tissue consists of two basic types of cells called neurons and neuroglia. The neurons or nerve cells are supported by neuroglia or glial cells. The neurons detect the stimuli and respond rapidly transmitting the information to other cells. The cell body of neuron is called neurosoma contains a nucleus and other organelles. Multiple, short and branched processes called dendrites extend from the neurosoma. The dendrites receive the signals from other cells and conduct the messages to neurosoma and a single longer nerve fiber called axon.
Stem cells are immature cells that are capable of developing into one or more types of matured and specialized cells. The ability of producing diversity of mature cell types is known as developmental plasticity. The adult stem cells (AS cells) exist in the several organs of the body. The adult stem cells developing into only one kind of mature cells are called unipotent cells. Such cells may develop into sperm or epidermal squamous cells.
2. A tissue that is cut in long direction is called as a longitudinal section. The tissue cut in perpendicular to the axis is called cross section or transverse section. A tissue section cut on slant between longitudinal and cross section is called as an oblique section.
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