Zoology - Locomotion and Movement Question with Solution | TestHub
Read the following statements (I-III) about human skeletal system and select the option that correctly justify the statements.
I. In man, vertebral column has 33 bones organized as 28 bones.
II. Pectoral girdle is made up of two bones only.
III. Osteoporosis is characterized by micro-architectural deterioration of the bone.
Options:
Answer:
Solution:
Our vertebral column is formed by 26 vertebrae with a central hollow portion (neural canal) through which the spinal cord passes. First vertebra is the atlas and it articulates with the occipital condyles. The vertebral column is differentiated into cervical (7), thoracic (12), lumbar (5), sacral (1-fused) and coccygeal (1-fused) regions starting from the skull.
Osteoporosis is a disease, in which bones loses minerals and fibres from its matrix. Imbalance of hormones like calcitonin, parathyroid and sex hormones, deficiencies of calcium and vitamin-D are the main causes of osteoporosis.
Pectoral girdle helps in the articulation of the upper limbs with the axial skeleton. The girdle is formed of two halves consisting of a clavicle and a scapula.
