Tag: the muscular system and digestive system in human beings

• Ingestion is the consumption of a substance by an organism.
• This is accomplished by taking in the substance through the mouth into the gastrointestinal tract, such as through eating or drinking.
  Hence, the correct answer is A.

Nutrition or food intake in paramecium of nutrition in amoeba is holozoic that is, amoeba is heterotrophic.

The seeds of Arachis hypogea (family-Papileonaceae) contain 40-50% oil contents. On. hydrogenation it yields vegetable ghee. It is very important non-drying oil used for cooking and also as illuminant and lubricant in soap industry.

• Each myofibril(a unit of the muscle cell) has alternate dark and light bands on it.
  
• The light bands contain actin and are called I-band or Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains myosin.
  
•  In the center of each ‘I’ band is an elastic fibre called ‘Z’ line which bisects it. The thin filaments are firmly attached to the ‘Z’ line.
  
• The ‘A’ and ‘I’ bands are arranged alternately throughout the length of the myofibrils. 
  
• The sarcomere is considered as the functional unit of contraction. The portion of the myofibril between two successive ‘Z’ lines is considered as a sarcomere. Hence sarcomere is the distance between two Z lines.
• So, the correct answer is 'Two Z-lines'.

• Each myofibril(a unit of the muscle cell) has alternate dark and light bands on it.
  
• The light bands contain actin and are called I-band or Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains myosin.
  
•  In the center of each ‘I’ band is an elastic fibre called ‘Z’ line which bisects it. The thin filaments are firmly attached to the ‘Z’ line.
  
•  The ‘A’ and ‘I’ bands are arranged alternately throughout the length of the myofibrils. 
  
• The sarcomere is considered as the functional unit of contraction. The portion of the myofibril between two successive ‘Z’ lines is considered as a sarcomere. Hence The functional unit of the contractile system of a striated muscle is sarcomere.
• So, the correct answer is 'Sarcomere'.

Syncytial cell is a cell that is multinucleated. It contains more than one nuclei. It is resulted from multiple cell fusions of uninuclear cells. The muscle fibre is a syncytial cell as it has multiple nuclei, in which each nucleus has originated from single myoblast.

• Aryepiglotticus is a muscle of the larynx running in the aryepiglottic fold from the arytenoid cartilage to the epiglottis.
• Hiltons' muscle is a muscle in which the nerve supplying the muscles extending directly across and acting at a given joint not only supplies the muscle but also innervates the joint and the skin overlying the muscle.
• Aryepiglotticus muscle is a Hiltons' muscle.
• So, the correct answer is 'Aryepiglotticus'.
  

• The 650 muscles in the body support movement  controlling  walking, talking, sitting, standing, eating and other daily functions that people consciously perform .
•  also help to maintain posture and circulate blood and other substances throughout the body.  so , option A is  correct