Smooth muscles, Biology

Assignment Help:

Smooth Muscles

Smooth muscles do not have transverse striations like those of skeletal and cardiac muscles. The smooth muscles line the blood vessels, digestive tract, urinary bladder, uterus etc. These are also present in the iris and skin. Smooth muscles are small and spindle shaped. Each muscle has a single nucleus. The cytoplasm of the smooth muscle cells contains actin and myosin filaments arranged in a random manner. Despite the lack of internal organisation of the filaments, there is cross bridge formation between the actin and myosin filaments. The contraction mechanism in smooth muscles is similar to the sliding filament type of contraction as found in the skeletal muscles.

1860_Smooth Muscles.png

Figure: Smooth Muscles.

In order to contract, smooth muscle need not be stimulated through the nerves. They show spontaneous rhythmic contractions that can vary in both frequency and intensity. This spontaneous activity of smooth muscle, however, can be modified by nerves as well as by hormones such as epinephrine and norepinephrine. A distinctive feature of vertebrate smooth muscle is the slowness of response. Another important property of it is that the smooth muscle can maintain contraction for prolonged periods with very little energy expenditure.


Related Discussions:- Smooth muscles

Explain simple staining technique, Explain Simple Staining Technique? H...

Explain Simple Staining Technique? Here single staining agent is used to determine the size, shape and arrangement of bacterial cells. It is simple and easy to perform. Dried s

Nursing care of common cold, Nursing Care of Common Cold: Relieve Nas...

Nursing Care of Common Cold: Relieve Nasal Congestion Clean the nasal passage to remove secretions. In  infants nasal aspirator can be used while  the older children can

Calculate the electric potential at the midpoint of the base, The three cha...

The three charges in the figure below are at the vertices of an isosceles triangle. Let q = 7.00 nC and calculate the electric potential at the midpoint of the base.

Dna, diagram of dna replication

diagram of dna replication

Rana tigrina, cranial and spinal nerves account of rana tigrina

cranial and spinal nerves account of rana tigrina

VASCULAR PLANTS., WHAT TRAITS ALLOWED VASCULAR PLANTS TO GROW TALL

WHAT TRAITS ALLOWED VASCULAR PLANTS TO GROW TALL

List four possible after-effects of solvent abuse, List four possible after...

List four possible after-effects of solvent abuse (glue-sniffing). Possible after-effects of solvent abuse are headache, nausea, vomiting, convulsions, runny nose, a rash round

.Botany, 57. While planning for an artificial hybridisation programme invol...

57. While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps will be irrelevant A usting of pollen on stigma B Collection

How many carbon dioxide molecules liberated in krebs cycle, Q. How many car...

Q. How many carbon dioxide (CO 2 ) molecules are liberated after each cycle of the Krebs cycle? For a single glucose how many carbon dioxide molecules were already liberated by the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd