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STRUCTURE OF A MYOFIBRIL -
(i) Primary Filaments (= Myosin Filaments). The primary filaments are thicker and confined to the A-bands only.
They are free at both the ends. They are composed of myosin (protein) and bear minute projections called cross- bridges of the protein meromyosin.
(ii) Secondary Filaments (= Actin Filaments). The secondary filaments are thinner and occur in I-bands, but extend for some distance into the A-bands between the primary filaments. This partial over lapping of the primary fila- ments by the secondary filaments gives dark appearance to the Abands. The secondary filaments are composed of the proteins actin, tropomysin and troponin. They are attached to the Z-lines by one end and are free at the other end. The secondary filaments are more numerous than the primary filaments. Six secondary filaments surround each primary filament. "
Cell plate: In the plants, a membrane-bound space produced during the process of cytokinesis by the vesicles of the Golgi apparatus. The cell plate fuses with plasma membrane, sep
Q. What is the essential morphology of a protozoan cell? Protozoans are eukaryotic cells so they have structures and organelles common to this kind of cell endoplasmic reticula
When we watch animals in the wild, most often we see them foraging for food. The foraging behaviour of animals has been a focus of behavioural studies for many decades. Natura
Q. Describe Coronary Spasm? Usually spasm develops at the site of subcritical or critical stenoses, but it may also occur in angiographically normal coronary arteries, the so c
Q. What is the etiological agent of cutaneous leishmaniasis? How is the disease transmitted and what are its typical manifestations? The protozoan Leishmania braziliensis is et
a) How do viruses enter plant body and spread to long distances within it? b) Mention any two ways by which viruses spread from single plant to another.
Chlorine (Cl) - Micronutrients The role of Cl - in plant is not clearly understood. Cl - is required in Hill reaction, the water splitting reaction of photosystem II. In the
Endocrine glands
Neonatal hypoglycaemia Hypoglycaemia is a metabolic condition of newborn piglets that develops in first few days of life due to decreased caloric intake and increased cataboli
Q. Adverse effect to intestinal mucosa? Alcohol: Alcohol is known to cause damage to intestinal mucosa independent of gastric acid content. Thus high amounts are not advised.
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