What are the threadlike structures found inside a muscle fiber?

What are the threadlike structures found inside a muscle fiber?

Muscle Fibers consist of Bundles of threadlike structures called MYOFIBRILS. Each Myofibril is made up of TWO Types of Protein Filaments- Thick ones and Thin ones. The THICK FILAMENTS are made up of a PROTEIN called MYOSIN. The THIN FILAMENTS are made of a PROTEIN called ACTIN.

What natural fiber has a ribbon cross section?

cotton fibre
2.4. The appearance of cotton fibre under the microscope. (a) Cotton fibre looking like a twisted ribbon; (b) the cotton fibre’s cross section is referred to as being kidney-shaped; (c) cotton fibre looking like a collapsed and twisted tube and (d) bundle of cotton fibres.

Which shape of fiber is wool quizlet?

Wool fiber is scaly , cotton is smooth, rayon is serrated. Can be straight, twisted, coiled or crimped. Cotton is naturally twisted and nylon is fairly straight.

What is the name of the process by which the enzyme thrombin and the protein fibrinogen combine to form fibrin a fiber that weaves around the platelet plug to form a blood clot?

prothrombin. Prothrombin is transformed into thrombin by a clotting factor known as factor X or prothrombinase; thrombin then acts to transform fibrinogen, also present in plasma, into fibrin, which, in combination with platelets from the blood, forms a clot (a process called coagulation).

What is the minimal level of stimulation required to cause a fiber to contract?

The minimal level of stimulation required to cause a muscle fiber to contract is called: a threshold stimulus. When a muscle fiber is stimulated it will contract to its fullest ability.

What stimulates a muscle fiber?

The action potential in the muscle fiber is initiated by the impulses arriving from motor neurons. This stimulation causes a reduction of the potential across the fiber membrane which initiates the ionic process involved in the pulse propagation.

What fiber has nodes?

Jute: Longitudinal View : Cross wise marks called nodes or joints. Cross sectional view : The fibres have a small central canal similar to the lumen in cotton. Several sided or polygonal with rounded edges.

Are natural fibers uniform?

Natural fibers are uniform in size. False, they aren’t uniform because they were made uneven by nature. You can always tell what a fabric is by made of by looking at it.

Which two measurements of fiber fineness are used for describing wool fibers?

Notes: Wool is the only fiber whose fineness, in practice, is specified by its diameter in the unit of micrometer as shown in Table 1.3. (1.4) Example 1.2: We consider a cotton fiber of 1.7 dtex fineness, 28 mm length and 1520 kgm−3 density.

What fiber has a triangular cross section?

silica fiber
[4] As shown in the inset (lower left), the silica fiber possesses an unusual feature, that is, a triangular cross section forming a triangular prismatic structure, as is clearly visible at the fiber tip.

What is the final step before a blood clot forms?

Vascular spasm is the first response as the blood vessels constrict to allow less blood to be lost. In the second step, platelet plug formation, platelets stick together to form a temporary seal to cover the break in the vessel wall. The third and last step is called coagulation or blood clotting.