Explain the intercostal muscles, Science

Assignment Help:

Explain the Intercostal Muscles

Look at Figure Can you spot the intercostal muscles?

Yes, there are 11 pairs of intercostal muscles. The intercoastal muscles are the muscles between the ribs which contract during inspiration to increase the volume of the chest cavity. They are located in the spaces between the ribs. They are arranged in two layers called the external intercostal muscles and the internal intercostal muscles.

2339_The intercostal muscles.png

1. The external intercostal muscle fibres extend in a downward and forward direction from the lower border of the rib above to the upper border of the rib below.

2. The internal intercostal muscle fibres extend in a downward and backward direction  from  the lower border of the rib above  to the upper border of the rib below. They cross the external intercostal muscle fibres at right angles. The intercostal muscles are stimulated to contract by intercostal nerves.

During inspiration, the intercostal muscles contract. They move upwards and outwards causing enlargement of the thoracic cavity as shown in the Figure.

During expiration, the volume of thoracic cavity is decreased by relaxation of diaphragm and intercostal muscles which results m increase in thoracic pressure and pressure of lungs. As a result, air is expired from lungs to the atmosphere.


Related Discussions:- Explain the intercostal muscles

Cosmic distances, Cosmic Distances: If  we asked you what the distanc...

Cosmic Distances: If  we asked you what the distance between Delhi and Kanyakumari is, you would say that it  is roughly 3000 km. Another way of answering the question would

Discovery of microbes, Discovery of Microbes The discovery of microbe...

Discovery of Microbes The discovery of microbes and the fact that they cause infectious diseases is one of the greatadvances in science, which has helped  us in understanding

Explain transport of oxygen by red blood cells, Explain Transport of Oxygen...

Explain Transport of Oxygen by Red Blood Cells Oxygen combines with haemoglobin, i.e., the red pigment in red blood cells. It combines with oxygen in the lungs, transports it a

Explain the blood urea nitrogen (bun), Explain the Blood Urea Nitrogen (BUN...

Explain the Blood Urea Nitrogen (BUN) It is a test that measures the amount of urea nitrogen in the blood. Urea is formed in the liver as an end product of protein metabolism a

Solutions, what is the unsaturated

what is the unsaturated

Reproduction, what are 5 different types of asexual reproduction?

what are 5 different types of asexual reproduction?

Define the blood groups, Define the Blood Groups We start our discussi...

Define the Blood Groups We start our discussion by answering the question - do all of us have the same blood group? No, each individual has a different blood group. The differ

A model reaction water turbine, A model reaction water turbine Use a so...

A model reaction water turbine Use a soda water bottle from which the bottom has been separate. Wind string around it near the bottom end and suspend it as shown in the diagram

##ssssslzlxslzlxxzllzxl\xl\x;slsc zzzzxm, Ask question #slslslslslss;s;a;s;...

Ask question #slslslslslss;s;a;s;xsppfjeerrtu uy ueueq fufa sf e rht rh oohs erh uh ff d euooeoe eryur r ir eer uryr ouruufhfskj u hegg hgg e eru rers ogg eroh ejhr err ef

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