Muscle and movements, Biology

Assignment Help:

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.

 


Related Discussions:- Muscle and movements

Structure of spermatozoan, STRUCTUR E OF SPERMATOZOAN Structure of spe...

STRUCTUR E OF SPERMATOZOAN Structure of sperm is divided into 3 parts -      (1) Head                  (2) Middle piece             (3) Tail 1 .       HEAD

Capital reserves, Capital Reserves 1. This is raised with selling shar...

Capital Reserves 1. This is raised with selling shares at a premium. As the difference among the market price less floatation costs and par value is credited to the capital re

Explain significance of mitosis for embryonic development, Q. What is the s...

Q. What is the significance of mitosis for the embryonic development? Every embryo grows from a single cell that bears mitosis and generates other cells that also divide themse

What are the frequencies of dominant and recessive allele, In a population ...

In a population of 200, 90 are homozygous dominant, 40 are heterozygotes, and 70 are homozygous recessive for a particular trait. What do you expect the frequencies of the dominant

What is cardio vasular examination in hheart disease, What is cardio vasula...

What is cardio vasular examination in hheart disease? Cardio-vascular examination: A thorough and systematically cardio-vascular examination provides valuable clues to the pr

Humans which distinguish them from other primates, State two characteristic...

State two characteristics of humans which distinguish them from other primates. Two features which differentiate humans from other primates are their upright posture and their

Germ layers - metazoa, Germ Layers - Metazoa The infolding of the blas...

Germ Layers - Metazoa The infolding of the blastoderm of the blastula forms a gastrula with two or more layers. The outer layer is the ectoderm' and the endoderm lines the inn

Efficient colors for photosynthesis, Q. What are the main divisions of whit...

Q. What are the main divisions of white light according to the electromagnetic spectrum? Which are the two mainly efficient colors for photosynthesis? The color divisions of th

Define the osazone test or phenylhydrazine reaction, Define the Osazone Tes...

Define the Osazone Test or Phenylhydrazine Reaction? Compounds with -CO-CHOH group form crystalline osazones with phenyl hydrazine. These osazones have characteristic shapes an

Onchology, Onchology : This is the study of cancer. Oncology word meaning i...

Onchology : This is the study of cancer. Oncology word meaning is mass, bulk & tumor. This is a branch of medicine which deals with tumors (cancer). The one who practices oncology

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