MYTUTOR SUBJECT ANSWERS

608 views

Describe the effect of calcium ions on tropomyosin and actin in skeletal muscle.

Within the muscle fibre tropomyosin is wrapped around actin filaments and it blocks the binding sites for the myosin-heads.

When calcium ion concentration increases, calcium ions bind to sites on the tropomyosin (troponin-c sites) and this causes a conformational change in shape.

This change in tropomyosin’s shape exposes the myosin-head binding sites on the actin filaments and allows cross-bridge binding to occur.

This then allows the actin and myosin fibres to slide over each other and shorten (contract) the muscle fibre.  This is known as Sliding Filament Theory.  

Aaron H. Mentoring -Medical School Preparation- tutor, Mentoring -Per...

2 years ago

Answered by Aaron, an A Level Human Biology tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

29 SUBJECT SPECIALISTS

£24 /hr

Benjamin W.

Degree: Medicine (Bachelors) - Oxford, Balliol College University

Subjects offered:Human Biology, Science+ 9 more

Human Biology
Science
Maths
History of Art
Chemistry
Biology
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Medical School Preparation-

“I am a friendly first year medical student studying at Oxford Uni! I am very flexible and I have a wide range of experience across many subjects and levels.”

£20 /hr

Victoria Marie M.

Degree: Neuroscience (Bachelors) - Cardiff University

Subjects offered:Human Biology, Chemistry+ 2 more

Human Biology
Chemistry
Biology
-Personal Statements-

“My name is Victoria and I’m currently studying Neuroscience. I’m passionate about my subject and hope that I will be able to help.”

MyTutor guarantee

£20 /hr

Michal D.

Degree: Medicine (Bachelors) - Newcastle University

Subjects offered:Human Biology, Chemistry+ 4 more

Human Biology
Chemistry
Biology
.UKCAT.
-Personal Statements-
-Medical School Preparation-

“I am a third year Medical Student at Newcastle University, currently undertaking a clinical placement year in hospital. While at Sixth form I was able to gain experience in tuition by helping out other students in their GCSEs and A-Le...”

About the author

Aaron H.

Currently unavailable: for regular students

Degree: Graduate Entry Medicine (MB ChB) (Bachelors) - Bristol University

Subjects offered:Human Biology, -Personal Statements-+ 1 more

Human Biology
-Personal Statements-
-Medical School Preparation-

“A little about me: After graduating with a BSc degree in Physiological Science (how the body works) I applied to study medicine as a graduate and am now studying to be a doctor at the University of Bristol.  I am fascinated by how th...”

You may also like...

Posts by Aaron

Describe the effect of calcium ions on tropomyosin and actin in skeletal muscle.

Describe the roles of DNA and RNA in determining the sequence of amino acids in proteins.

Explain how voltage-gated sodium ion channels on the membranes of neurones generate an action potential.

People with AF often also have narrowing of the valve between the left atrium and the left ventricle. This causes the wall of the left atrium to become thicker. Suggest why.

Other A Level Human Biology questions

What is the Role of the Liver during the Metabolism of Food Products?

What is X-linked recessive inheritance?

What is a Vitamin?

What is the role of a vitamin in the body?

View A Level Human Biology tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok