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Mostly muscle cells

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Cameron Hirthe

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3y ago

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Do skeletal muscle fibers contain sarcomeres whereas smooth muscle fibers do not?

Yes, skeletal muscle fibers contain sarcomeres, which are the repeating units responsible for muscle contractions. In contrast, smooth muscle fibers do not have sarcomeres in the same organized structure but still have contractile proteins.


Does cardiac muscle and heart have the same relationship?

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


Is a muscle cell a fiber?

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


What kind of muscle makes your heart?

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.


What happens to a muscle in the body when it gets longer?

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.


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

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.


How are your skeletal smooth and cardiac muscles the same?

All three types of muscles are composed of muscle fibers that contract in response to nerve signals. They are all involved in movement and support the body's structure. Additionally, they each contain proteins called actin and myosin that are responsible for muscle contraction.


Does increased muscle density mean more myofibrils per muscle fiber?

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.


What is a pennate muscle?

Pennate MusclesIn a pennate muscle, the fascicles form a common angle with the tendon. Because the muscle cells pull at an angle, contracting pennate muscles do not move their tendons as far as parallel muscles do. But a pennate muscle contains more muscle fibers--and, as a result, produces more tension--than does a parallel muscle of the same size. (Tension production is proportional to the number of contracting sarcomeres; the more muscle fibers, the more myofibrils and sarcomeres.)


How is skeletal muscle adapted for its role in the body?

Skeletal muscle is striated and composed of long, multinucleated fibers that can contract and relax to generate movement. It contains numerous mitochondria to produce energy for muscle contractions, and is innervated by motor neurons to enable voluntary control. Additionally, muscle fibers have a high density of myofibrils, which contain actin and myosin filaments that slide past each other to facilitate muscle contraction.


Are the most body movements isotonic or isometric?

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.


How is new skeletal muscle formed?

New skeletal muscle is generally not produced after the body has fully matured. The number of individual muscle cell fibers does not change throughout life. Take Arnold Schwarzenegger for example, before he developed, and after he lost, his Olympian physique he had the same number of muscle cells throughout the entire time, even to his 'saggy' present day condition. When muscles become larger or smaller, as seen from the exterior of the body, they only change in thickness, not in number. Through the division and fusion of satellite cells