Arteries carry oxygenated blood away from the heart, these are the thick-walled muscular tube, while Veins carry deoxygenated blood towards the heart. Though both have the exception of the pulmonary artery and vein, as here the system get opposite and the pulmonary artery carries the deoxygenated blood, and pulmonary vein carries oxygenated blood. Among the two types of circulatory system - Open circulation and Closed circulation. In vertebrates, closed type of circulatory system is found, … [Read more...]

Sperm is the male gamete, produced in the testis of a male, while Ovum is the female gamete, produced in the ovary of a female. Ovum, also known as egg cell and is said to be the largest cell in the female body. On the contrary Sperm cells is the smallest cell in the male body. Egg cell and sperm cells differ in many ways, which can be their origin, nature, composition, and purpose for existence. Though both play an important role at the time of human reproduction process, where the … [Read more...]

A bone is a hard connective tissue, while cartilage is soft connective tissue. Bones form the skeletal structure of the body, whereas cartilage is present in nose, ear, ribs, larynx, and joints and also act as a shock absorber in these joints. Bones protect against the mechanical damage and supports the movement of the body, provide shape to the body. And as cartilage being soft they are usually found along the respiratory tract, between the joints and in other flexible parts of the … [Read more...]

The animal has a cord or backbone in their body structure are chordates. Contrary, Non-chordates are the animals without backbone or notochord, this the vital difference between chordates and non-chordates is that the. These animals belong to the different phyla of the animal kingdom. Also being same at the multicellular level, there is a lot of difference between patterns of organization of cells in this kingdom. Lower animals like coelenterates, sponges differ in cellular level of … [Read more...]

Cold-blooded are the animals which cannot regulate their internal body temperature according to the required level and they keep on changing their temperature according to the changes in external environment temperature. Although Warm-blooded animals attempt to keep their internal body temperature maintained and does not change the same along with changes in external environment. For example, if it is colder outside, the body of Warm-blooded animals try to adapt according to the situation and … [Read more...]

Invertebrates lack the well- developed skeleton system, backbone, notochord as well nervous system whereas, Vertebrates constitutes, segmented, motile vertebral column together term as the spine, along with proper organized, nervous system, digestive system, gastrointestinal tract, respiratory system (which can be gills or lungs). All the animals present on earth are classified in two categories only, which are Invertebrates or Vertebrates. Though it is said that Vertebrates arose from … [Read more...]