B5 The Living Body

Question 1

Describe the different forms of internal skeletons

Answer 1

• Made only of cartilage (sharks)

- Made mainly of bone with some cartilage (humans)

Question 2

Describe the different types of fractures

Answer 2

• Compound (the bone penetrates the skin)
• Simple ( the bone doesn’t penetrate the skin)
• Green Stick (the bone is bent but not broken)

Question 3

Describe the term joint

Answer 3

A joint is the place where two or more bones meet and are joined together by ligaments. The bones are able to move due to the presence of muscles.

Question 4

Give an example of a:

• Fixed joint
• Hinge joint
• Ball and socket joint

Answer 4

• Skull
• Knee, Elbow
• Shoulder, Hip

Question 5

Identification of ulna, radius, humerus, biceps, triceps

Answer 5

Done

Question 6

Advantages of internal skeleton over external skeleton (4)

Answer 6

• Grows with the body
• Easy to attach muscles
• Provide framework to the body
• Flexibility is improved

Question 7

Describe the structure of a long bone

Answer 7

• Head with the covering of cartilage

- Shaft containing bone marrow with blood vessels