Locomotion and Movement · Question 33

Sliding filament theory can be best explained as

1. actin and myosin filaments do not shorten but rather slide past each other
2. when myofilaments slide past each other, myosin filaments shorten while actin filaments do not shorten
3. when myofilaments slide past each other actin filaments shorten while myosin filaments do not shorten
4. actin and myosin filaments shorten and slide past each other.

Glenoid cavity articulates

1. clavicle with scapula
2. humerus with scapula
3. clavicle with acromion
4. scapula with acromion.

Select the correct matching of the type of the joint with the example in human skeletal system.

1. Cartilaginous – Between frontal and parietal
2. Pivot joint – Between third and fourth cervical vertebrae
3. Hinge joint – Between humerus and pectoral girdle
4. Gliding joint – Between carpals

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