of a white blood cell ranges from to days. These are destroyed in the lymphatic system. XI Std Biology-Zoology Glossary Comments: • There are pairs of ribs. • Each rib is connected dorsally to the vertebral column and ventrally to the sternum.
. HUMERUS BONE . PELVIC GIRDLE . RIB CAGE III.
Identify and comment on the given bone/joint ‘C’. Identification: The given specimen/picture kept for identification is the human – humerus bone. Identification: The given specimen kept for identification is the human pelvic girdle . Identification: The given specimen kept for identification is the human ribcage .
Comments: • It is found between the shoulder and elbow. • The head of humerus articulates with the glenoid cavity of the pectoral girdle. • The other end of the humerus articulates with the two forearm bones namely the radius and ulna. Comments: • It is composed of hip bones called coxal bones together with the sacrum and coccyx.
• It is a heavy structure specialized for weight bearing. • Each coxal bone consists of fused bones namely the ilium, ischium and pubis. • At the point of fusion of the bones, a socket called acetabulum is present. • The acetabulum is meant for the articulation of the lower limbs.
Head of humerus Shaft Coronoid fossa Ilium Coccyx Pubic arch Ischium 7UXHULEV )DOVHULEV )ORDWLQJULEV 6WHUQXP 9HUWHEUDOERQH XI Std Biology-Zoology Glossary Comments: • It is a type of synovial joint. • In this type, the ball shaped rounded bone fits into the cup like depression of another bone. • It allows multi directional movements and rotation. • This type of joints are found between the upper arm and shoulder and between the upper leg and hip.
Comments: • It is a disorder in which the adrenal glands do not produce enough hormones. • It is caused due to hyposecretion of glucocorticoids and mineralocorticoids from the adrenal cortex. • Muscular weakness, low BP,