Test: Locomotion & Movement - 2 - NEET MCQ

Pivot joint: Between atlas and axis called atlanto-axial joint.

Muscle fibres have properties of excitability, elasticity and contractility but conductivity is not present in muscles fibers. These fibres help in movement of different body parts.

Hip bone or pelvic girdle consists of two coxal bones. Each coxal bone is formed by the fusion of three bones- ilium, ischium and pubis

Aging will be characterized by decreased muscle size and increased muscle fat. With aging muscle loose its contractile and elasticity nature. Fats are deposited in muscle fibres the further decrease contracting ability.

Myoglobin is found to be highly abundant in muscles of whales and seals. Myoglobin being oxygen and iron binding protein allowing organisms to hold their breathe longer underwater.

Muscular dystrophy is a genetic disorder and genetically inherited. It may also occurs due to mutated dystrophin gene and nutritional defects at the pre-netal age. Males are more affected by MD although females can be carriers of it.

Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins.

Humans possess 26 vertebrae in the vertebral column. These vertebrae are divided into five different regions, namely the cervical (7), thoracic (12), lumbar (5), sacral (1-fused) and coccygeal (1-fused) regions.

Artificial joints are made up of metal and plastic. The figure shown above shows artificial joint in the knee.

The upright posture in human is facilitated by massive hind limbs bones that makes broad feet and pelvis to withhold the weight of whole body.

Hypoparathryrodism is the condition in which body secretes abnormally low level of parathyroid hormone. This deficiency may lead to hypocalcemia and tatany.

The label x is H-zone, y is I band and z is A band.

Statement 1: Each pectoral girdle has two pairs of bones: a pair of clavicles and a pair of scapulae. The pectoral girdle, also known as the shoulder girdle, is a skeletal structure that connects the upper limb to the axial skeleton.
Statement 2: The head of the humerus bone articulates with the glenoid cavity of the pectoral girdle.
Hence both are correct.

Tetany is caused due to rapid spasms (wild contractions) in muscle due to low Ca++ inbody fluid.

The chemical energy is converted into mechanical energy during muscle contraction and the chemical is a neurotransmitter. In a contracted muscle, volume remains the same and a contracted muscle becomes shorter and thicker.

Hip bone is called as innominate bone, kneebone is called as patella, collarbone is called as clavicle and immovable joint is called suture.

During vigorous exercise, lactic acid accumulates in muscles cells to meet the energy requirement of muscle cell. Lactic acid is formed due to insufficient availability of oxygen. Breathing rate increases due to the high  rate of metabolism. The increased metabolic rate needs a huge amount of oxygen, which can be provided by increasing the rate of respiration.

Myasthenia gravis is an auto immune disorder affecting neuromuscular junction leading to fatigue, weakening and paralysis of skeletal muscle.

• The light bands contain actin and is called Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains myosin.
• Actin filaments are thinner as compared to the myosin filaments, hence are commonly called thin and thick filaments respectively.
• In the centre of each ‘I’ band is an elastic fibre called ‘Z’ line which bisects it.