Keratinized vs Non-keratinized Epithelium Difference between Keratinized and Non-keratinized Epithelial Tissues
Epithelium constitutes the outer layer of body surfaces, linings of the alimentary canal and the walls of hollow structures. It covers the internal or external surfaces of the body. The functions epithelial tissue is to protect the underlying tissues from physical damages, infection, desiccation, UV radiation and heat loss. Based on the presence of Keratin, the epithelial tissues are categorized into Keratinized epithelium and Non-keratinized epithelial tissues. Keratins are a diverse group of structural proteins that form the intermediate filament network and they provide the structural integrity of keratinized epithelial cells.
The present post discusses the Difference between Keratinized and Non-keratinized Epithelial Cells.
Simple Epithelium vs Compound Epithelium (Similarities and Difference between Simple and Compound Epithelial Tissues)
Epithelial tissue is a tissue system in animals that forms the outer layer of body surfaces, the linings of the alimentary canal and the walls of hollow structures. It covers the internal or external surfaces of the body. In the previous post, we have discussed the Structure, Classification and Functions of Epithelial Tissues. Based on the number of cell-layers, the epithelial tissues are classified into Simple Epithelial Tissue and Compound (Stratified) Epithelial Tissue. The present post discusses the Similarities and Differences between Simple and Compound Epithelial Tissues in animals.
Adaptation definition:‘Any feature of an organism or its part which enables it to exist under conditions of its habitat is called adaptation.’ The adaptations are mainly to withstand the adverse conditions of the environment and to use the maximum benefit of the environment.
What are Parasites?
A parasite is an organism which lives in or on another organism (called host) and benefits by deriving shelter and nutrients from them. The parasitism is a type of negative ecological / biological interaction in nature where one organism gets benefited (the parasite) and the other is harmed (the host). The parasites may be microbes such as bacteria, virus and Mycoplasma, or animals such as liver fluke, worms, nematodes, some insects and plants such as Loranthus, Cuscuta etc. All types of parasites show peculiar adaptations to survive in or on the host system and to get maximum benefit from them.
Arteries vs Veins Similarities and Differences between Arteries and Veins
The circulatory system in an organism ensures the transport of oxygen, nutrients, carbon dioxide and hormone throughout the body. The blood circulatory system in an animal is facilitated by the heart (the blood pumping organ) and blood vessels (closed pipelines which carry out the circulation of blood throughout the body). There are three types of blood vessels in our body. They are:
(1). Arteries (2). Veins (3). Capillaries
(1). Artery: They are blood vessels which originated from the heart and carry blood away from the heart. Arteries usually carry oxygenated blood except for pulmonary and umbilical arteries that carries deoxygenated blood.
(2). Vein: They are blood vessels which carry blood to the heart from various organs of the body. Veins usually carry deoxygenated blood except for pulmonary and umbilical vein that carries oxygenated blood.
(3). Capillaries: They are minutes blood vessels of one cell layer thickness and they facilitate the exchange of oxygen, carbon dioxide, nutrients and hormones in the blood to individuals cells of different organs. Arteries and veins are interconnected through capillaries and thus the blood circulation forms a closed system in majority of animals.
The current post describes the similarities and differences between Arteries and Veins with a comparison table.
Similarities between Arteries and Veins
Ø Both are blood vessels.
Ø Both transport blood.
Ø Blood transport is unidirectional in both arteries and vein.
Ø Arteries and veins composed of layers of cells.
Ø Both arteries and veins composed of three layers of cells namely Tunica externa (external layer), tunica media (middle layer) and tunica interna (internal layer).
Ø Both arteries and veins are covered by muscular tissues which assist in the contraction or expansion of blood vessels.
Ø Both undergo vasoconstriction and vasodilation to adjust the blood pressure according to the action of hormones and neurotransmitters.