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

How big is the earth, How big is the Earth? The Earth size : is neith...

How big is the Earth? The Earth size : is neither the largest nor smallest planet in our solar system. It is the largest of the non-gaseous planets (Mercury, Venus, Mars, and

Define volume of urine - general examination of urine, Define Volume of Uri...

Define Volume of Urine - General Examination of Urine Volume: Measurement of the volume of each urine specimen passed is necessary for the conditions in which the fluid balance

Variables, please give me some variable for making of hypothesis

please give me some variable for making of hypothesis

Main steps involved during post-harvest handling produce, Q. List the main...

Q. List the main steps involved during post-harvest handling fresh produce? Main steps involved during post-harvest handling fresh produce are: Field processing: sorting, gr

Explain what is deamination reaction, Explain what is Deamination Reaction ...

Explain what is Deamination Reaction ? Deamination is a process by which N of amino acid is removed as ammonia (NH3). These reactions occur primarily in liver and kidney. The

Psychology, thesis writing with 40 pages, topic Mapping the criminal mind: ...

thesis writing with 40 pages, topic Mapping the criminal mind: Profiling and its limitation''.

Explain air inhalation and expiration by pressure gradients, 1.  Sketch and...

1.  Sketch and explain different regions of phase diagram of water (pressure vs. temperature). 2.  Explain how air inhalation and expiration takes place through pressure gradient

Explain the detailed process of oil extraction, Oil extraction : Extraction...

Oil extraction : Extraction of oil from the prepared oilseeds can be done by one of the following methods: (i) traditional method: ghani, (ii) Improved methods:

Explain Metabolism, Metabolism   All  of  the  organized  chemical  reactio...

Metabolism   All  of  the  organized  chemical  reactions  in  a  cell  which  are under the control of enzymes.

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