Medical / boiology question about cardiac muscle?

Question

Medical Or Biology question regarding organelle and cardiac muscle?
I need help in answering this question:
1. Cardiac muscle is likely to require a large amount of a particular organelle.
i. identify the organelle likely to be present in cardiac muscle. Justify your answer

Answer 1

This is the nearest explanation ,i can find to the relationship between cardiac muscle and organelle ( mitochondria)
I hope this helps you

>^,,^<
--------------------------------------------------------------------------------

Although skeletal and cardiac muscle are similar in many ways, there are important physiological differences that make cardiac muscle much less prone to fatigue.
As you point out in your question, the build-up of lactic acid plays a major role in muscle fatigue. Lactic acid is a by-product of an anaerobic form of muscle metabolism (one lacking oxygen).
Cardiac muscle has the advantage of being supplied with oxygen from the blood stream via the coronary artery. This artery is large, and is one of the first places oxygenated blood travels to after it leaves heart. As a result, the blood supply to cardiac muscle cells is very rich in oxygen, making unnecessary for the heart to switch to anaerobic metabolism to produce ATP.

Another important difference between cardiac and skeletal muscle that is important in preventing cardiac muscle fatigue,
is the relative number of mitochondria, an organelle ,
important in energy production.
In general, cardiac muscle cells,
have many more mitochondria than skeletal muscle cells. Because it is mitochondria that produce ATP ,while utilizing oxygen (aerobic metabolism),
cardiac muscle cells are able to produce more ATP per cell, when oxygen is in good supply, than skeletal muscle cells can.

I hope these points have answered your excellent question. To be honest, it is not a question that I had personally thought about before you asked it, so I very much enjoyed composing this answer.

-------------------------------------------------------------------------------
Muscle Physiology and Anatomy ..
. Cardiac muscle contraction never stops... Calcium ions are stored in a special organelle called Sarcoplasmic Reticulum. ...
www.bergen.org/ACADEMY/Bio/AnP/AnP1/AnP1Tri2/FIGS/MUSCLE/muscle.html
-
Re: Why does cardiac muscle not fatigue?
Although skeletal and cardiac muscle are similar in many ways, there are ... fatigue is the relative number of mitochondria, an organelle important in energy ...
www.madsci.org/posts/archives/jul99/933090515.Me.r.html


list of muscles
MITOCHONDRIA - organelle where respiration takes place ... three main types: a) skeletal muscle. b) smooth muscle. c) cardiac muscle ..
.www.poohbah.ndo.co.uk/apmuscle.htm

Answer 2

ceprn is spot on. i'll try and clarify just a little. angina = a medical term meaning a lack of oxygen to heart muscle. if the oxygen supply is restored then no permanent damage heart attack = myocardial infarction = where angina continues to a stage where actual death of heart muscle occurs. this is irreversible and the body fills the dead tissue with scar tissue forever leaving a weakness. this will depend in the amount of dead muscle and where the dead muscle is cardiac arrest = a condition where the heart stops pumping efficiently. usually meaning VF (ventricular fibrillation) where the main pumping chambers of the heart just quiver and dont do anything useful. but technically there are other types of 'arrests' out there. a large enough heart attack can trigger a cardiac arrest. cardiac asthma = new term to me but i'm sold by the definition of it being due to fluid in the lungs from the heart not pumping properly; the heart and lungs are closely tied together. if the heart is damaged from previous heart attacks, or if you have another condition that causes it to not pump blood as well, then you will have cardiac asthma. (cardiac asthma is not a common UK term. i assume it is a USA term)

Answer 3

mitochondria.....that is what produces the atp needed for conductile cells to contract without stimulation thus causing your heart to beat without nervous input