Question

Write a short note on blood, contractile protien, skin

Answer 1

(1)
Blood is a connective tissue. majority of blood is made of liquid called plasma . plasma is matrix of the blood.blood have different cells in it
1.red platelets( erythrocytes)
2.white blood cells(leukocytes)
3.blood platelets(thrombocytes)

(2)

The cytoplasm of cells is a colloidal network of contractile proteins. Actin filaments are the major components of this network. Other contractile proteins interact with these filaments to create structural rigidity and movement. 2. The structure and function of contractile proteins is striated muscles is well characterized and thus provides a good example for extrapolitation to an analysis of contractile-protein structure and function of nonmuscle cells. However, the interaction of contractile proteins of various cells may be unique. 3. The study of contractile proteins in cells other than muscle has distinct difficulties: (a) The proteins are present in much lower concentration than in muscle, and only a few cell types are obtainable for study in quantities comparable to muscle. (b) Proteolysis and other detriments may be more severe in nonmuscle cells. (c) The organization of contractile proteins is difficult to define in nonmuscle cells. (d) The effort is diffuse; investigations examine a wide variety of different, or less commonly the same, cells. Reflecting these difficulties, a catalogue of putative nonmuscle cell fucntions related to contractile proteins reveals no one system to be definitively worked out. Nevertheless, the ubiquity of contractile proteins and the obvious importance of their intractions presages increasing relevancy for physiology and medicine.

(3)

The human skin is the outer covering of the body. In humans, it is the largest organ of the integumentary system. The skin has up to seven layers of ectodermaltissue and guards the underlying muscles, bones, ligaments and internal organs. Human skin is similar to most of the other mammals skin, and human skin is very similar to pig skin. Though nearly all human skin is covered with hair follicles, it can appear hairless. There are two general types of skin, hairy and glabrous skin (hairless). The adjective cutaneous literally means "of the skin" (from Latin cutis, skin).
Because it interfaces with the environment, skin plays an important immunity role in protecting the body against pathogens and excessive water loss.Its other functions are insulation, temperature regulation, sensation, synthesis of vitamin D, and the protection of vitamin B folates. Severely damaged skin will try to heal by forming scar tissue. This is often discolored and depigmented.