Muscular System

Do all cardiac muscle fibers all contract at the same time?


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2009-07-29 03:17:18
2009-07-29 03:17:18

No. The heart muscle contracts in sections, first the top (atrium) then the bottom (ventricle). But when it is working properly, the heart muscle fibers contract together in large groups.

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The heart is composed of cardiac muscle fibers. It is the same thing.

You call it as cardiac muscles. The muscle fibers contract rhythmically. The muscle fibers are attached to each other end to end. This facilitates the conduction of the impulse. The muscle fiber can be stimulated to give you contraction of the the same.

Yes, It does. :) Cardiac muscle have a nucleus, same as skeletal muscle and smooth muscle

There are two types of cardiac muscle cells, those that contract and those that set the rhythm. Both are basically the same cell.

Heart muscle is striated but not in the same way that skeletal muscle is. Cardiac muscle is a type of involuntary striated muscle found only in the walls of the heart.Cardiac and skeletal muscle are similar in that both appear to be striated in that they contain sarcomeres. In striated muscle, such as skeletal and cardiac muscle, the actin and myosin filaments each have a specific and constant length on the order of a few micrometers, far less than the length of the elongated muscle cell (a few millimeters in the case of human skeletal muscle cells).The filaments are organized into repeated subunits along the length. These subunits are called sarcomeres. The sarcomeres are what give skeletal and cardiac muscles their striated appearance of narrow dark and light bands, because of the parallel arrangement of the actin and myosin filaments.However, cardiac muscle has unique features relative to skeletal muscle. For one, the myocytes are much shorter and are narrower than the skeletal muscle cells, being about 0.1 millimeters long and 0.02 millimeters wide .Furthermore, while skeletal muscles are arranged in regular, parallel bundles, cardiac muscle connects at branching, irregular angles.Anatomically, the muscle fibers are typically branched like a tree branch. In addition, cardiac muscle fibers connect to other cardiac muscle fibers through intercalcated discs and form the appearance of a syncytium (continuous cellular material).These intercalcated discs, which appear as irregularly-spaced dark bands between myocytes, are a unique and prominent feature of cardiac muscle .

which has more nuclei per cell skeletal muscle or cardiac muscle? I guess that they both have the same number of nuclei.

Yes, biologists often refer to skeletal muscle cells as fibers, although they aren't the same as plant fibers.

Most body movements involve isotonic muscle contractions: the muscle fibers either lengthen or shorten as they contract.An isometric contraction involves the muscle fibers staying the same length. Holding something steady, or pushing against a brick wall, are examples of isometric contraction.

Skeletal muscleBranchiomeric muscle (the same as skeletal muscle but different embryology)Cardiac muscle

the striated portions of the intrafusal fiber contract to keep the spindle taut at different muscle lengths. If the whole muscle is stretched, the muscle spindle is also stretched, triggering sensory nerve impulses on its nerve fiber. These sensory fibers synapse in the spinal chord with lower motor neurons leading back to the same muscle. Impulses triggered by stretch of the muscle spindle contract the skeletal muscle.

Cells that are the same form tissues. Muscle cells form muscle tissue.

The proteins that form the visible striations in skeletal and cardiac muscle are not organized the same way in smooth muscle. It contacts in a similar way but much more slowly and in waves. Some of the proteins are different ones but still produce movement.

You get stronger. The individual muscle fibers become thicker with more myofibrils inside them. The number of muscle cells stays the same, contrary to popular belief that you grow more muscle fibers, this is not true.

This is not possible. The spinal cord is wired so that when an extensor muscle contracts, a flexor muscle must relax. It is not possible to contract antagonizing muscle groups at the same time.

technically muscle fibres are classified as red or white but they are the same thing

Cardiac muscle is involuntary because its muscles related to the heart and if they were voluntary you would have to mentally tell your heart to pump each time. Smooth muscle tissue is involuntary because of the same reason as cardiac but instead it is located in areas such as hollow organs in the body, blood vessels,bladder, uterus,digestive tract.

Uhh, no uncontrolled muscle contraction occurs in smooth and cardiac muscles... there are many differences between these two types of muscles; controlled and uncontrolled muscle contraction.....

in the cardiac cicle, the cardiac muscle work the same time as it rest. is not true that never tires. and if you eat meat, at the end only give to the bodye aminoacids, the cardiac tissue need glucose and oxigen EVERY time it works! otherwise harth attack is available.

Yes, it means that you will gain more myofibrils per muscle fiber. A muscle fiber is a muscle cell, and everybody has about the same number. When you train your muscles, they will develop more myofibrils inside the muscle cells. So you cannot change the number of muscle fibers, or cells, but you can change the number of fibers, or myofibrils, inside them. The end result is more muscle density, not more muscle cells.

Cardiac Muscle it can be found in the heart it is called Involuntary because its contraction does not require conscious effort. It is also Striated in the same way as skeletal muscle.Hope I helped!!!

The answer to your homework-assignment is:3 types of muscle-tissue occurs in the human body:Smooth muscle (not discussed in this answer)Skeletal muscleCardiac muscleCardiac and skeletal muscle will look more or less the same seen through the lens of a microscope, because they are both striated. However, there are small differences which we wont get into here. Physiologically as well as anatomically (at cell level) there are several other important differences.The most obvious reason however is this: While you can move skeletal muscle voluntarily, i.e. clenching your fist or flexing your biceps, you cannot voluntarily move cardiac muscle. It is self-governing and under higher control from the central nervous system.And the type of muscle used in the heart - yes you guessed it - Cardiac Muscle.

Same way as all the other cells. Delivered by the blood through capillaries.

ofcourse not; slow twitch muscle fibers are: * smaller in diameter * red in color * depend on oxidative phosphorylation for their ATP supply * are highly vascularized (better blood supply) * have more mitochondria * more myoglobin fast twitch muscle fibers * larger * white * glycolysis is the source of ATP * less vascularized * less mitochondria * less myoglobin

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