Lesson learnt on 12 july

Yesterday,our teacher started on a new topic which we are familiar with-
Cells,Tissues,Organs and Systems
As everyone knows,cells are the smallest unit of life.
There are animal cells and plant cells in animal and plant respectively.

Similarities between animal and plant cells
-Both have nucleus,cell membrane and cytoplasm.
Differences between animal and plant cells
-Animal cells have small and numerous vacuoles while plant cells only have one big vacuole.
-Animal cell's vacuoles contain air,food and water,whereas plants cell's vacuole has sugar and salt.
-Plant's cell contains chloroplasts but not animal's cells.
-Plant's cell contains cell wall but not animal's cells.

Many cells form Tissue.
Many Tissue form Organ.
Many Organ form Organ System.
Many Organ System form a Organism.

In plants,the tissue found are:
Epidermal Tissue ( known as Epidermis as well )
Xylem Tissue
Phloem Tissue
Photosynthesis Tissue ( known as mesophyll as well )
Palisade Tissue
Epidermal Tissue protects the underlying cells of a leaf by preventing water loss and acts as a barrier to fungi and other invaderes.

Xylem Tissue transports water and dissolved mineral salts to the leaf.

Phloem Tissue transports the manufactured food away from the leaf to other parts of the plant.

Photosynthesis Tissue carries out photosynthesis.

Palisade Mesophyll Tissue are long cylindrical cells that occur at right angle to the epidermis.It contains numerous chloroplasts for photosynthesis.

In animals,the tissues found are :
Epithelial Tissue ( known as Epithelium )
Muscle Tissue
Connective Tissue
Nerves Tissue
Glandular Tissue

Epithelial Tissue covers the internal and external surfaces of an organ.It lines both the outside ( skin ) and the inside cavities of an animal.Its functions include secretion,absorption,protections,trancellular transport,sense of touch.

Muscle Tissue is divided into three main groups :
-Smooth Muscle Tissue
It's from hollow organs such as stomach etc.Its function is the propulsion of substances along internal passageways.
-Skeletal Muscle Tissue
It's from skeletal muscle.Its function is the contraction for voluntary movements.
-Cardiac Muscle
It's found along the walls of the heart.It pumps blood in the circulatory system.

Reflections
After learning all these, I am more aware aboiut my body system and organs. I also learnt more about the functions of the organs and system. This will come in handy when some part of my body is not working, example the epithelial tissue, and I will know it as the function is not present.