What is the difference between tissues organs and cells?
What is the difference between tissues organs and cells?
An explanation of how cells make up tissues which in turn make up organs. A group of cells working together is defined as a tissue and several tissues working together comprise an organ. …
Which is the world’s smallest cell?
Mycoplasma
Which is smallest animal cell?
The smallest cell is Mycoplasma gallicepticum. It is about 10 micrometer in size. The largest cells is an egg of ostrich.
Which cells can change their shape?
1. White blood cells (WBCs):- In human blood, white blood cells or leukocytes have the ability to change their form or shape.
Why do white blood cells change shape?
So the cells must deform to fit through them. To change shape, the cells rearrange protein components of their internal scaffolding, called the cytoskeleton.
What is the shape of nerve cells?
Nerve cells are usually shaped like trees. From the round, pyramidal or spindle-shaped cell body the dendrites (greek: dendrites = tree-like) branch out like the top of a tree and the single axon travels out like the trunk.
How is body tissue formed?
Tissues are formed from the assemblage of cells and intercellular materials in various proportions in which one component predominates. In nervous tissue as an example, nerve cells predominate while in connective tissues such as Ligaments and Tendons, intercellular fibrous materials predominate.
Do cells have a nucleus?
A cell normally contains only one nucleus. Under some conditions, however, the nucleus divides but the cytoplasm does not. This produces a multinucleate cell (syncytium) such as occurs in skeletal muscle fibres. Some cells—e.g., the human red blood cell—lose their nuclei upon maturation.
How do the cells acquire definite shapes?
Cells acquire definite shape due to different building material. In plant cell, the shape is determined by the cellulose wall. The Ribo-nucleic Acids (RNA) are made in such a way that they provide cells a certain shape for being tough and rigid from the exterior.
How are the cells protected?
Follow these steps to lock cells in a worksheet: Select the cells you want to lock. On the Home tab, in the Alignment group, click the small arrow to open the Format Cells popup window. On the Protection tab, select the Locked check box, and then click OK to close the popup.