Muscle and movements, Biology

Muscle and Movements

Earlier you have read about amoeboid movement, ciliary and flagellar movement. In this section you will learn how muscles are involved in the movement. Muscle cells are found in almost all the phyla of the animal kingdom except the phylum protozoa. Contraction and relaxation of these muscles brings about movement in the organisms. In vertebrates there are three types of muscles: skeletal muscles, cardiac muscles and smooth muscles. Skeletal muscles are attached to the bones in the arms, legs and the spinal cord and produce activities such as walking, movement of head, hands etc. Cardiac muscles are the muscles of the heart. These are specialised for continuous contractions of the heart, needed in pumping of the blood.

Smooth muscles are present in the walls of internal organs such as the large and small intestine, the gall bladder and large blood vessels. Contraction and relaxation of smooth muscles control the diameter of blood vessels and also propel food along the gastro-intestinal tract. Under the microscope the skeletal muscles and the cardiac muscles exhibit transverse light and dark bands alternating with each other. Therefore, the skeletal muscles and the cardiac muscles are also called striated muscles. The smooth muscles do not have striations.

 

Posted Date: 1/16/2013 4:21:55 AM | Location : United States







Related Discussions:- Muscle and movements, Assignment Help, Ask Question on Muscle and movements, Get Answer, Expert's Help, Muscle and movements Discussions

Write discussion on Muscle and movements
Your posts are moderated
Related Questions
what is the tubular digestive tract?

Metabolic Significance of HMP Pathway Having gone  through  the HMP pathway, you would have got  some idea about the significance  of this alternative oxidative  pathway for  t

Q. Can you explain Puffeelfish poisoning? Tetrodotoxin (TTX) causes pufferfish (tetrodon) poisoning, also known as blowfish poisoning or fugu. How does a pufferfish look l

A glycosidic bond would be present in: Select one: a. acetone. b. methyl-alpha-D-glucose. c. 2-deoxy-beta-D-ribose. d. glucose-6-phosphate. e. fructose-1, 6-bisph

Q. What is the destination of the notochord in protochordates and in vertebrates? In vertebrates the notochord disappears and gives birth to the spinal column known as vertebra

Hospitalization Hospitalization is stressful experience  for children,  adolescents  and their families.  It is an interruption  of the child's active cycle of growth and deve

Explain the Compartments of Body Water? Within the body, water is found in two major compartments. These are: - The intracellular compartment (inside the cell) - The extr

What is Cyanobacteria or Blue-green bacteria? Blue-green bacteria, or cyanobacteria, used to be classified as blue-green algae within the Plant Kingdom, primarily because they

Why does oxygen concentration in the blood decrease during exercise? Why does carbon dioxide concentration in the blood change during exercise?

In the early 1970's, Schroeder and his group designed a single stage implant system known by the name of ITI Implant System. They demonstrated that one-stage implant can also resul