cell organisation in the human body

The epithelial cells become specialized to form receptors that are capable of receiving the various external and internal stimuli, and transferring them to the nerve cells. E.g. Photoreceptors, thermoreceptors, osmoreceptors, pressure receptor..

The table shows the percentages of the female and male populations who became the members of a social organisation in certain years from 1955 onwards. Which of the following is true for the given data? Year 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 Women(%) 38.7 40.7 42.3 46.3 49...

The data corresponding to the level of red blood cells in men and women of 27 years of age is given. Find the test value and check whether the means differ at 99% confidence. Men 3.06 2.87 3.6 3.52 Women 1.34 1.70 2.9 1.5 => 2.808, the means do not differ or 5.616, the means do not differ..

The molecules of various chemical substances in a specific proportion become organised into protoplasm - the physical basis of life. The protoplasm gets organised into cells, which represents the structural and functional unit of life. A living organism may have a sin..

The human body has elaborate mechanisms for protection against foreign bodies, germs and cancer cells..

Chromosome number is a species-specific character. The complete set of chromosomes in the body cell of a species is known as karyotype. For example, the 23 pairs of chromosomes found in the somatic cells represent the human karyotype. In the karyotype it is p..

One of the main characteristics used in defining grades of animal complexity is the presence or absence of tissues. Tissues are the aggregations of embryologically and morphologically similar cells that become arranged to perform specific functions. The protozoans occur as single cel..

Summary - Animals may reproduce by asexual and sexual modes. The reproductive system of sexually reproducing animals consists of primary sex organs which produce the gametes, the secondary sex organs which participate in reproduction but do not form gametes and accessory sex characters which distin..

The human circulatory system is a closed circulatory system. The blood flows in closed vessels without coming in direct contact with the cells of the body..

Chromosome number is a species-specific character. The complete set of chromosomes in the body cell of a species is known as karyotype. For example, the 23 pairs of chromosomes found in the somatic cells represent the human karyotyp..