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Is the epithelium vascularized? How do nutrients and oxygen reach the epithelium? Why is this feature a significant evolutionary acquisition?
Epithelia are not vascularized (capillaries do not directly reach their cells). The epithelium exchanges substances by dispersal with the connective tissue situated under it.
As the epithelia are not vascularized minuscule skin injuries or scratches that occur all the time do not trigger bleeding and do not expose the blood to contamination from external agents. This is an significant protective method discovered by evolution.
Mechanism of Maturation The basic mechanism of maturation of ovum is more or less similar in all organisms. The primordial germ cells that enter into the ovary divide mitotica
PINEAL GLAND (EPIPHYSIS CEREBRI) - It develops from the ectoderm of the embryo. The pineal gland is located between the cerebral hemispheres, where it protrudes from the
Periimplant Sulcus Fluid Analysis (PISF) This is not a parameter for clinical use but for experimental situations. However, it is important for us to know about it. Several bio
Explain Ventilation (NIV)? This refers to the use of mechanical ventilatory support without the use of an endotracheal tube. NIV may be by the application of a continuous posit
A dihybrid cross yields 320 F2 offspring. How many are expected to resemble the homozygous recessive parental?
The lower course - Classification of the river The lower course of the river occurs in the plains, across which it meanders or zigzags slowly. The river here loses much of its
Q. What are the catalysts? Catalysts are substances that decrease the activation energy of a chemical reaction, facilitating it or making it energetically viable. The catalyst
What are the three main parts of a eukaryotic cell? The eukaryotic cell can be divided into two major portions: the cell membrane that divides the intracellular space from the
What is the control center of the cell? The nucleus contains DNA, which having the instructions for all the functions of the body.
how to identify in contaminants and aldultrants in pure ingredients
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