Cellular organization : Short Question
Red blood cells: are found in the blood. They carry oxygen around the body.
Epithelial cells: are found in outer layer of the skin. They protect and also produce some secretions.
Bone cells: make up the bones that support our body.
An organ is a collection of two or more tissues organized to carry out a particular function For example: Heart Skin Lungs Stomach
Cytoplasm is a jelly-like substance which makes up most of the cell in both plants and animals. The cytoplasm contains a number of small structures called organelles. These perform several functions.
A tissue is a collection of similar cells that work together on a specific task. For example: • Cardiac muscle tissue. • Skeletal tissue. • Nerve tissue.
Chlorophyll is the name of the green-coloured pigment inside chloroplasts.
Cell membrane is a layer which is present in animal as well as plant cells. It controls what goes into and out of the cell.
A tissue is a collection of similar cells that work together on a specific task.
Smooth muscle tissue:
Smooth muscle tissue contracts and relaxes to cause movement of internal body organs. They are present in stomach and help in digestion of food.
Plant cell: Cell wall is present. Plant cells have a large vacuole. They have a regular shape. They also have chloroplasts. Animal cell: Cell wall is absent. Animal cells have small vacuoles. They have irregular shape. They do not have chloroplasts. Similarities: Both have mitochondria. Both have a nucleus. Both have a cell membrane. Both have cytoplasm.
Plants are made up of roots, stems, leaves and flowers. All of these are plant organs. Organs work together to keep the plant alive. The functions of the main organs of a flowering plant are following: • Roots: Roots anchor the plant in soil. Root hairs give large surface area to absorb water and mineral salts from soil. • Stem: Stem grows upward towards light. It supports the plants body. It also carries water and mineral salts to the leaves and food around the plant. • Leaves: Leaves are the organs of photosynthesis. They make all the food for the plant body. They have green pigment called chlorophyll which absorbs sunlight for photosynthesis. They also have stomata which help in gaseous exchange. • Flowers: Flowers contain plant’s reproductive organs. Many flowers attract insects which carry pollen between plants to bring about pollination and fertilization.
Tissue: A tissue is a collection of similar cells that work together on a specific task. For example: epithelial tissue, connective tissue, muscle tissue and nervous tissue. It is major structural component of an organ. Always even in shape, without any gaps between cellular components. Organ: An organ is a collection of two or more tissues organized to carry out a particular function. For example: heart , lungs, stomach, kidney, liver, bladder etc. It is major functional component of an organ system. Can be hollow in structure.
We need to cut a very thin slice of a specimen to look at it under a light microscope. So that the material is thin enough for light to be able to pass through it.
