The skeletal muscle, responsible for voluntary contraction is composed of 1) Myofilaments 2) Myofibrilles 3) Muscle fibers 4) Muscle (from the left to the right in the image)
<h3>
What is the composition of the skeletal muscle?</h3>
The elements composing the skeletal muscle are,
- Myofilaments ⇒ Actine and miosine
- Sarcomere ⇒ It is the functional unit with the contractile apparatus. Composed of the Z band, A and I bands, and H zone.
- Myofibrilles ⇒ They have the Functional units
- Muscle fibers ⇒ Surrounded by endomysium
- Fascicle ⇒ Group of fibers surrounded by perimysium.
- Muscle ⇒ Group of fascicles surrounded by epimysium.
The sarcomere is the contractile unit in a skeletal muscle. The thick myosin myofilaments are located in the central region of the sarcomere, which corresponds to the A band.
Thin filaments united to the Z lines, extends to the interior of the A band until they reach the border of the H band.
The I band is formed solely of thin actin filaments, belonging to two sarcomeres adjacent to a Z line.
When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in length of the sarcomere.
- The H line and the I band get shorter.
- The Z lines get closer to the A band, meaning that they get closer to each other. The A band keeps constant in length.
- This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.
For a better understanding about muscle contraction, look at the attached files.
From the left to the right,
1) Myofilaments
2) Myofibrilles
3) Muscle fibers
4) Muscle
You can learn more about skeletal muscle structure at
brainly.com/question/11246024
brainly.com/question/12213587
#SPJ1
Answer:
Si refrigeramos o congelamos el alimento, las bacterias presentes en ellos tendrán un metabolismo más lento, incluso llegando al punto de la muerte por encima de temperaturas a las cuales no les es posible vivir. Es importante mantener la cadena de frío para que las bacterias no tengan lugar a su reproducción.
Explanation:
Las distintas bacterias que pueden estar presentes en los alimentos tienen distintos parámetros que hacen que sea posible su vida y reproducción. En cuanto a la temperatura, es un factor muy importante ya que podemos encontrar bacterias termolábiles o termoresistentes según puedan vivir en las variaciones de temperatura. La mayoría de ellas no resiste temperaturas frías de refrigeramiento o congelamiento, motivo por el cual los alimentos se conservan así. De esta forma reducimos el riesgo de padecer Enfermedades de Transmisión Alimentaria. La cadena de frío por su parte permite que esa temperatura sea constante a lo largo de todo el procesamiento, transporte y disposición de los alimentos.
Answer:
Genetic engineering has been applied in numerous fields including research, medicine, industrial biotechnology and agriculture. In research GMOs are used to study gene function and expression through loss of function, gain of function, tracking and expression experiments.
Explanation:
A common birth defect characterized by an opening between the upper lip and the nose is called Cleft Lip. Cleft lip happens during the early stage of pregnancy. This occurs when there is an unsuccessful connection in the face and lip area while the fetus is developing inside the womb. Both cleft lip and cleft palate are successfully treated with surgery.
Hello mate,
___________
may be ...All the information needed to mqke proteins is coded in DNA by ♢♢♢adenine, thymine, cytosine and guanine.
__________
I hope it will help you :-)
