The cancellous bone beneath the articular cartilage in a synovial joint:

1. provides a smooth surface for articulating

2. absorbs shocks and helps protect the joint

3. holds together the bones of the synovial joint

4. secretes synovial fluid

Assertion: In the human body, an example of a second-class lever is found in the lower leg when someone stands on tiptoes.
Reason: The axis is formed by the metatarsophalangeal joints, the resistance is the weight of the body, and the force is applied to the calcaneus bone (heel) by the gastrocnemius and soleus muscles through the Achilles tendon.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

The joint that is weak inferiorly and is most likely to be dislocated is:

1. knee joint

2. hip joint

3. shoulder joint

4. elbow

The articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage but their stability is due to the presence of:

1. fascia.

2. joint capsule.

3. tendon sheath.

4. aponeurosis.