Locomotion and Movement · Question 36

Stimulation of a muscle fiber by a motor neuron occurs at

1. the neuromuscular junction
2. the transverse tubules
3. the myofibril
4. the sarcoplasmic reticulum.

Select the correct statement with respect to locomotion in humans.

1. The vertebral column has 10 thoracic vertebrae.
2. The joint between adjacent vertebrae is a fibrous joint.
3. A decreased level of progesterone causes osteoporosis in old people.
4. Accumulation of uric acid crystals in joints causes their inflammation.

The H-zone in the skeletal muscle fibre is due to

1. the central gap between actin filaments extending through myosin filaments in the A-band
2. extension of myosin filaments in the central portion of the A-band
3. the absence of myofibrils in the central portion of A-band
4. the central gap between myosin filaments in the A-band.

The characteristic and an example of a synovial joint in humans is

1. array|l|l| Characteristics & Examples \ Fluid filled synovial cavity & Joint between atlas \ between two bones & and axis \ array
2. array|l|l| Characteristics & Examples \ Lymph filled between two & Gliding joint between \ bones, limited movement & carpals \ array
3. array|l|l| Characteristics & Examples \ Fluid cartilage between two & Knee joint \ bones, limited movements & \ array
4. array|l|l| Characteristics & Examples \ Fluid filled between two & Skull bones \ joints, provides cushion & \ array

During muscle contraction in humans, the

1. sarcomere does not shorten
2. A band remains same
3. A, H and I bands shorten
4. actin filaments shorten.

Select the correct statement with respect to disorders of muscles in humans.

1. Failure of neuromuscular transmission in myasthenia gravis can prevent normal swallowing.
2. Accumulation of urea and creatine in the joints causes their inflammation.
3. An overdose of vitamin D causes osteoporosis.
4. Rapid contractions of skeletal muscles cause muscle dystrophy.

Which one of the following pairs of chemical substances, is correctly categorised ?

1. Secretin and rhodopsin - Polypeptide hormones
2. Pepsin and prolactin - Two digestive enzymes secreted in stomach
3. Troponin and myosin - Complex proteins in striated muscles
4. Calcitonin and thymosin - Thyroid hormones

Select the correct statement regarding the specific disorder of muscular or skeletal system.

1. Muscular dystrophy – Age related shortening of muscles
2. Osteoporosis – Decrease in bone mass and higher chances of fractures with advancing age
3. Myasthenia gravis – Autoimmune disorder which inhibits sliding of myosin filaments
4. Gout – Inflammation of joints due to extra deposition of calcium

Three of the following pairs of the human skeletal parts are correctly matched with their respective inclusive skeletal category and one pair is not matched. Identify the non-matching pair.

1. array|l|l| Pair of skeletal parts & Category \ Sternum and ribs & Axial skeleton \ array
2. array|l|l| Pair of skeletal parts & Category \ Clavicle and glenoid & Pelvic girdle \ array
3. array|l|l| Pair of skeletal parts & Category \ Humerus and ulna & Appendicular skeleton \ array
4. array|l|l| Pair of skeletal parts & Category \ Malleus and stapes & Ear ossicles \ array

Which one of the following pairs of structures is correctly matched with their correct description?

1. Structure Tibia and fibula, Description Both form parts of knee joint
2. Structure Shoulder joint and elbow joint, Description Ball and socket type of joint
3. Structure Cartilage and cornea, Description No blood supply but do require oxygen for respiratory need
4. Structure Premolars and molars, Description 20 in all and 3-rooted