Skeleton

Question 1

Human skeletom

Answer 1

It is endoskeleton, internal skeleton composed of bone and cartilage which are formed by living cells

Question 2

What do bine a d cartilage contain

Answer 2

Conrain non living mineral substances sucha s calcium phosphates and calcium carbonates

Question 3

Bones

Answer 3

Hard, rigid and non elastic tissues

Question 4

Cartilage

Answer 4

Softer than bones, less rigid and slightly elastic

Question 5

Axial skelefon

Answer 5

Has skull and vertebral column, ribs and sternum

Question 6

Appendicular skeleton

Answer 6

Pectoral gridle: shoulder and arms

Pelvic gridle: hip and legs

Question 7

1.Fuction of skeletal system

Answer 7

Support

• raise the bodu from ground
• arrangemnt of bones fives shape to body as whoel
• rigid skelton to support soft parts of body

Question 8

2.Fuction of skeletal system

Answer 8

Movemnt

• the skelton is jointdd to allow movemnt
• movemnt is acheived by muscles are connected tk the boned
• the bonss act as levers and the muscles contract to pull them in different positions

Question 9

3.Fuction of skeletal system

Answer 9

Protection
To protect the delicate parts of the body e.g.
Cranium protects the brain
Vertebral colum protects the spinal cord
Rib cage protects the heart and the lungs0

Question 10

4.Fuction of skeletal system

Answer 10

Production

Of red abd white blood cells in the bone marrow

Question 11

Types of joints
What are joints
How are they classified

Answer 11

Where two bones meet a joint is formed
Bones can move in relatio to one another at joints
Joints ars classified according ti the degtee of movemnt oissible between the articulating surface

Question 12

1.Types of joints

Answer 12

Fixed joint
No movemnt permitted
Structures between the bines of the skull
Pelvic gridle

Question 13

2.Types of joints

Answer 13

Gliding joint
Limited sliding movemnt
The vertebrae of vertebral column
Wrist

Question 14

3.Types of joints

Answer 14

Pivot joint
Allows nodding and limited head rotation
Neck

Question 15

4.Types of joints

Answer 15

Hinge joint
Allows movemnt in 1 plane
Elbow , knee

Question 16

5.Types of joints

Answer 16

Ball and socket

Question 17

5.Types of joints

Answer 17

Nall and socker
Allows mkbemnt on 2 planes
Shoulder and hip

Question 18

Bendinb the forearm

Answer 18

.. biceps(flexor) contract and become shorter abd thucker
..triceps(extensor) relax
..ilna and radius pill closer to the humerus

Question 19

Straightening the forearm

Answer 19

Triceps contract and becime shorter and thucker
Biceos relax
Ulna and radius pull away fro the humerus

Question 20

How are skeletal muscles attached to bones and hwk they woek

Answer 20

Attached to the projections or ridges in the bones of the forarm by tendons which are non elastic cords that anchor muscles to bones.
One end of the muscle must be attached to the bone that is to be moved while the other end is anchored to part of the skeleton that is to be held stationary with respect to the moving part

Question 21

How is the movemnt in forearms brought

Answer 21

Movement in foreaem is brought about by the alternate contraction and relaxation of a pair of antagonistic muscles in the forearm

In the forarm the anaygonsitsic pair of flexor extensor muscles are arranged in such a way that when they contract they pull in opposite directions

Question 22

Structure of forearm

Answer 22

Forarm is made of humerus, the upper arm ,ulna and radius

the wrist and the hand is made of small carpal bones metacarpal and phalanges
The humerus forms a ball and socket joint with the scapula of the shoulder and hinge joint is formed between humerus and ulna at elbow