{"id":19384,"date":"2022-05-17T10:30:57","date_gmt":"2022-05-17T05:00:57","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=19384"},"modified":"2023-11-10T11:40:06","modified_gmt":"2023-11-10T06:10:06","slug":"frank-icse-solutions-class-9-biology-skeletal-system","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/frank-icse-solutions-class-9-biology-skeletal-system\/","title":{"rendered":"Frank ICSE Solutions for Class 9 Biology – The Skeletal System"},"content":{"rendered":"
PAGE NO:162 <\/strong><\/span><\/p>\n Solution 1:<\/strong><\/span> Solution 2:<\/strong><\/span> Solution 3:<\/strong><\/span> Solution 4:<\/strong><\/span> Solution 5:<\/strong><\/span><\/p>\n Solution 6:<\/strong><\/span> Solution 7:<\/strong><\/span> Solution 8:<\/strong><\/span> \u00a0Axial skeleton:<\/strong> This consists of skull, vertebral column, sternum and ribs. Human skull has 22 bones of which 8 are present in the cranium and 14 on the face. Brain is present in the cavity called cranium. In the occipital region is an opening called foramen magnum through which spinal cord passes. Cranium has 8 bones which covers the brain from all sides. Sternum and Ribs<\/strong> Solution 9:<\/strong><\/span> Solution 10:<\/strong><\/span> Solution 11:<\/strong><\/span> Importance of pelvic girdle:<\/strong><\/p>\n Solution 12:<\/strong><\/span> Solution 13:<\/strong><\/span> Solution 14:<\/strong><\/span> \u00a0Sternum and Ribs:<\/strong> Solution 15:<\/strong><\/span> Solution 16:<\/strong><\/span> Solution 17:<\/strong><\/span><\/p>\n Solution 18:<\/strong><\/span> Solution 19:<\/strong><\/span> Solution 20:<\/strong><\/span> Solution 21:<\/strong><\/span> Solution 22:<\/strong><\/span> Solution 23:<\/strong><\/span> Solution 24:<\/strong><\/span><\/p>\n Solution 25:<\/strong><\/span><\/p>\n (b) Bicep muscles and triceps are antagonistic muscles. PAGE NO:163 <\/strong><\/span><\/p>\n Solution 26:<\/strong><\/span><\/p>\n Biology<\/a>Chemistry<\/a>Physics<\/a>Maths<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" Frank ICSE Solutions for Class 9 Biology – The Skeletal System PAGE NO:162 Solution 1: Bones of skull, vertebral column, sternum and ribs. Solution 2: Longest bone – Femur Smallest bone – Stapes of middle ear. Solution 3: There are seven cervical vertebrae. First vertebra is called atlas, second is axis while the rest are … Read more<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[172,6442,3034],"tags":[6813,6808,6807,6823,6822,6866,6824,6811,6821],"yoast_head":"\n
\nBones of skull, vertebral column, sternum and ribs.<\/p>\n
\nLongest bone – Femur
\nSmallest bone – Stapes of middle ear.<\/p>\n
\nThere are seven cervical vertebrae. First vertebra is called atlas, second is axis while the rest are called typical cervical vertebrae.<\/p>\n
\nThe skeletal system performs the following functions in an animal:<\/p>\n\n
\n
\nThe various parts of a human skeleton are:<\/strong><\/p>\n\n
\n<\/p>\n
\nOn the basis of position, endoskeleton is divided into two main parts:<\/p>\n
\n\u00a0Facial bones:<\/strong> These bones form the face and protect the sensory organs present in the head. It has 14 bones.
\nVertebral Column:<\/strong>
\nIt makes the axis of the body and provides support like a pillar. Vertebral column is divided into following five parts:<\/p>\n\n
\nSternum is the bone at the mid-ventral line of the thorax to which most of the ribs are attached at their ventral ends. Ribs are formed by vertebral and sterna part. First seven pairs of ribs are called true ribs. These are joined on one side with sternum and on second side with thorax.
\nAppendicular skeleton<\/strong>: It consists of limbs, shoulder or pectoral girdle and hip or pelvic girdles and bones of limbs.<\/p>\n\n
\n
\n<\/p>\n
\n<\/p>\n
\nImportance of pectoral girdle:<\/strong><\/p>\n\n
\n
\nThe place of joining of two or more than two bones is called joint.<\/p>\n
\nFlexor<\/strong> is a muscle that causes bending of a limb or other part e.g. thigh muscle.
\nExtensor<\/strong> is the muscle that causes the straightening of a limb or other part. E.g. for extending the foot
\nLevator<\/strong> is the muscle that raises any part of the body.
\nRotator<\/strong> is a muscle that rotates one part on another.<\/p>\n
\nAxial skeleton: This consists of skull, vertebral column, sternum and ribs. Human skull has 22 bones of which 8 are present in the cranium and 14 on the face. Brain is present in the cavity called cranium. In the occipital region is an opening called foramen magnum through which spinal cord passes. Cranium has 8 bones which covers the brain from all sides.
\nFacial bones:<\/strong> These bones form the face and protect the sensory organs present in the head. It has 14 bones.
\nVertebral Column:<\/strong>
\nIt makes the axis of the body and provides support like a pillar. Vertebral column is divided into following five parts:<\/p>\n\n
\nSternum is the bone at the mid-ventral line of the thorax to which most of the ribs are attached at their ventral ends. Ribs are formed by vertebral and sterna part. First seven pairs of ribs are called true ribs. These are joined on one side with sternum and on second side with thorax.
\n\u00a0Appendicular skeleton:<\/strong> It consists of limbs, shoulder or pectoral girdle and hip or pelvic girdles and bones of limbs.<\/p>\n\n
\nForelimbs consists of one humerus (anterior arm bone), one radius and one ulna (posterior arm bones), 8 carpals (wrist bones), 5 metacarpals ( palm bones) and 14 phalanges (finger bones).
\nHindlimb consists of one femur bone or thigh bone, one tibia and fibula which are bones of the leg, 8 tarsals (bones of ankle), 5 metatarsals (bones of feet), and 14 phalanges (bones of fingers).<\/p>\n
\nThe three levers found in the human skeleton are:<\/strong><\/p>\n\n
\n
\nIn a ball and socket joint, the ball of one bone is fitted into the socket of another bone such that the ball can move in the socket. Such a joint always involves a long bone, which can move in all planes. This type of joint is found in pectoral girdle, glenoid cavity, femur and acetabulum of pelvic girdle.<\/p>\n
\nForelimbs consists of one humerus (anterior arm bone), one radius and one ulna (posterior arm bones), 8 carpals (wrist bones), 5 metacarpals (palm bones) and 14 phalanges (finger bones).
\nHind limb consists of one femur bone or thigh bone, one tibia and fibula which are bones of the leg, 8 tarsal (bones of ankle), 5 metatarsals (bones of feet), and 14 phalanges (bones of fingers).<\/p>\n
\nBiceps muscles first contract to bend the arm, following which the triceps muscles act to straighten the arm. Thus act in opposite ways and are antagonistic muscles, since they counteract each other’s action. The muscles of biceps are called flexor muscle while that of the triceps is the extensor muscle. This whole coordination of muscular action is under the nerve impulse and brain control.<\/p>\n
\nMuscles which counteract each other’s actions are known as antagonistic muscles. Biceps and triceps are two such muscles.<\/p>\n
\nBiceps cause bending of a limb or other part. Triceps cause straightening of a limb or other part.<\/p>\n
\nStriped, Unstriped and cardiac muscles.<\/p>\n\n
\n2- synovial cavity
\n3- synovial fluid
\n4- synovial membrane<\/li>\n<\/ol>\n\n
\n(c) Bicep muscles.
\n(d) Shoulder bones.
\n(e) Ball and socket joint.<\/p>\n\n