FEATURES OF THE SKELETAL MUSCLE

By -

Certain Features Of The Skeletal Muscle Fibre ; Striations
A band; the thick filaments are made up of myosin fibres and and align at the middle of the sarcomere and this forms what is called the A-band. Because of the thick filaments, they are dark in appearance, but also based on the fact that the thin filaments also overlap the thick filaments at the edge of the A band, it gives it a more darker appearance. If this overlap occurs at the edges of the A band it tells us that certain points on the A band will be lighter than the other- this will mean the edges will be even more darker than the centre of the A band and this section is called the H zone ( this is so because  it only consist of thick filamens and not an overlap of thin and thick. At the centre of the H zone are certain dark myomesin protein lines that vertically dissects the H zone and they are called the M line
NOTE; The A bands is not the filament itself, its only given this association by virtue of the arrangement of the filaments ( same goes for the I band)
I band; Thin filaments are made up of actin  and are at the edges of a sarcomere and this is what makes up the I band. They are generally lighter in appearance ( even lighter than the A band). On the I band is a darker area that serves as a midline interruption for each I band and this is called the Z disc
NOTE;  From a Z disc to another Z disc serves as the demarcation of a sarcomere

Comments

Post a Comment

Popular posts from this blog

PICK YOURSELF UP AND START ALL OVER !

By -
Image
PICK YOURSELF UP AND START ALL OVER!!! Have you ever failed before?...well, I have...and these failures are lesser known stories....you see, we have all failed and we will all fail at some point...especially as medical students. I remember my first 'failure' in preclinicals. It was in my first anatomy dissection practical...I was excited, I always was then and in came the brilliant Dr Ashaolu  to introduce us to anatomy dissection. Several human bones were placed in front of us that day and we all watched in amazement how these contoured brown sticks were from actual people that lived. Dr Ashaolu beckoned to my class rep (Titilola) and asked her to point out the best 'student' in class and for some reason, she called two (2) of us and up we stood. He turned to me, and briskly said- "describe the bone in front of you!"...I went into shock. All I could see was some 'fan shaped bone with a weirdly shaped handle and uneven lines'. I was dumbstr...
Read more

ANTI - FOOTBALL???

By -
Anti – Football (Football without its beauty)         The just concluded UEFA EURO 2016 will be remembered for many occurrences like the violence between English and Russian fans, the surprising display of Iceland, the handball-like displays of two German footballers in the knockout stages of the competition and Cristiano Ronaldo’s theatrics from the touchline in the final match between Portugal and France. However, one disturbing part of the competition that would always be noted in the record books was Portugal’s display of Anti – Football in the final match of the competition. They were just so defensive and lacking flair in the final third especially after Ronaldo’s injury. Other teams like Iceland were also thought to have deployed negative football tactics with Ronaldo’s tongue lashing towards the little country termed unnecessary and an act of arrogance. Fernando Santos’ Portugal team were singled out for criticism because they playe...
Read more

A Short PDF on clinical correlates of the cardiovascular system

By -
CLINICAL CORELLATES OF CARDIOVASCULAR SYSTEM 1. During pregnancy of Mrs Ade, ultrasound scan was carried out on the baby and an abnormal  heart beat (ARRHYTHMIA) was discovered. Further scans [MRI and x-ray] were carried out. After  the birth of the baby, it was discovered that the baby had bluish lip, skin & fingers, also low birth  weight, feeding and breathing difficulties. It was concluded that the symptoms were as a result  of early heart structure development problems which interfered with the flow of blood. The  disease was confirmed to be CONGENITAL HEART DISEASE which could result from lots of factors  i.e. infection in mother during 1st trimester, congenital defect of foetus body and could be  hereditary. Since the disease was not serious enough for HEART TRANSPLANT or  CATHETERIZATION (a medical procedure in which a tube is directed to the heart through a part  of the body to administer treatment or make d...
Read more