Question

Belly of a muscle is
A. Upper part of muscle
B. Middle part of muscle
C. Lower part of muscle
D. None of the above

Answer 1

Muscles are specialized tissues that are responsible for the movement of body parts. They are soft tissues and muscle cells are called the myocytes. The muscle is made up of two parts namely the muscle origin and muscle insertion. The muscle also contains a bulging portion known as the muscle belly. The muscle belly is the sum of all muscle fibres in any muscle.

Complete answer:
Option A) upper part of muscle: The upper part of the muscle is also known as the origin of muscle. It is the attachment site and it doesn't move during contraction. The origin of a muscle will be on the proximal bone or the one closest to the core of the body. The upper part is not the belly of a muscle.
Option A is incorrect.
Option B) middle part of muscle: The middle part of the muscle is bulged in shape and it is called the belly. It is present in between the tendons. The total muscle fibre in any muscle group together to form the muscle belly.
Option B is correct.
Option C) lower part of muscle: The lower part of muscle is also called the insertion. It is the point at which a muscle is attached to a bone moved by that muscle. The insertion of a muscle will be on the distal bone or the bone furthest from the core of the body.
Option C is incorrect.
Option D) none of the above: This option is wrong since the correct answer i.e., the upper part of muscle is given in the options.
Option D is incorrect.

Hence, Option B) Middle part of the muscle is the correct answer.

Note:
A human body contains more than $630$ muscles. The cells of the muscle are called myocytes. They contain unique proteins called actin and myosin which help in the contraction and relaxation of muscles. Based on the location, muscles can be classified into three types. The Striated or Skeletal Muscles, Non-Striated or Smooth Muscles and the Cardiac Muscles.