Skeletal and Muscular Systems

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Skeletal and Muscular Systems — Free MYP2 Sciences Practice Questions

1QuestionFunctions of the Human SkeletonConcept Practice

2 marks~3 minCriterion A

The diagram shows a human skeleton with one bone structure labeled A.

Identify the name of structure A. [1]

Describe one function of structure A in the human body. [1]

Solutions

2QuestionFunctions of the Human SkeletonAssessment Practice

4 marks~6 minCriterion D

A PE teacher says running on concrete causes micro-damage (tiny cracks) to bones, so teenagers should run on grass instead.

Identify two functions of the human skeleton. [1]

Explain why a teenager's bones may recover from micro-damage caused by running on concrete. [1]

Compare the strengths and limitations of the PE teacher's advice. [2]

Solutions

3QuestionProtection Support and MovementAssessment Practice

5 marks~8 minCriterion B

The table below shows the bone mineral density (BMD — a measure of how much mineral is packed into bone) and the breaking force for four animal bones.

BMD ( $\text{g/cm}^2$ )	0.5	0.8	1.1	1.4
Breaking force (N)	200	320	440	560

Identify the relationship between BMD and breaking force shown in the table. [1]

Calculate the increase in breaking force for every

0.1\ \text{g/cm}^2

increase in BMD. Show your working. [2]

A bone with a BMD of

1.0\ \text{g/cm}^2

is placed under a load of 500 N. Using your answer from (b), estimate the breaking force of this bone, then explain whether it is likely to break. [2]

Solutions

4QuestionFunctions of the Human SkeletonAssessment Practice

6 marks~9 minCriterion C

A student tests two chicken leg bones of similar size. One bone is left raw; the other is baked at

200^\circ\text{C}

for 30 minutes. A machine records the force needed to break each bone and the bone's mass.

Raw bone — mass:

12.5\ \text{g}

; force at fracture:

340\ \text{N}

Baked bone — mass:

11.8\ \text{g}

; force at fracture:

480\ \text{N}

Calculate the force-to-mass ratio (N/g) for each bone. [2]

Describe what the difference in force-to-mass ratios tells you about the effect of baking on bone strength. [2]

Compare the conclusion "baking makes bones stronger" with the limitations of this investigation. [2]

Solutions

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