INTRODUCTION / DEFINITIONS.
Tissues is a group of cells that are similar in structure and work. The three types of simple tissues are parenchyma, collenchyma and sclerenchyma.
Apical stem is found at the tip of root or shoot of the plant.
Any of the various branched protoplasmic extensions of a nerve cell that conducts impulses from adjacent cells inward toward the cell body is a dendrite.
A muscle that is made up of long fibers characterized by transverse striations ia a striated muscle.
The constituents of phloem are sieve tubes, companion cells, phloem parenchyma and phloem fibres.
More than one type of cells which work together as a unit , is a complex tissues.
The cells of the cardiac muscles. are small, cylindrical, uninucleate striated with short lateral branches
Stomata are sites where exchange of gases (carbon dioxide and oxygen) occurs between the plant interior and external environment.
Lignin is a class of complex organic polymers that form key structural materials in the support tissues of vascular plants and some algae.
Cork cells are dead, filled with tannins, resin and air and have no intercellular spaces
A body whose particles move easily among themselves is termed as a fluid.
Areolar connective tissue binds muscles with bones
Aerenchyma is a specialised parenchyma found in aquatic plants which consists of network of small cells that enclose large air cavities
Endoskeleton forms the internal supporting framework of the animal body.
Cavities can be termed as any space or compartment, or potential space in the animal body.
Skeletal connective tissue is that connective tissue in which the matrix is solid and the living cells occur inside fluid filled spaces called lacunae
Synapse is a junction between two neurons without developing an organic union
Vacuoles are absent in meristematic plant cells.
The specific function of cardiac muscle is rhythmic contraction and relaxation continuously throughout life without getting fatigued.
Blood circulates throughout the body, receiving and providing materials to all tissues and organs of the body. It thus connects all parts of the body.
Anything that does not permit the passage of substances (e.g. liquids, gases) is called impervious.