Synovial Joint

Question 1

What is the structure and function of a ligament

Answer 1

• a tough band of slightly elastic connective tissue

- connects bone to bone and stabilises the joint during movement

Question 2

What is the structure and function of the synovial fluid

Answer 2

• lubricating liquid contained within the joint cavity

- reduces friction and nourishes articulated cartilage

Question 3

What is the structure and function of articulate cartilage

Answer 3

• smooth tissue which covers the surface of articulating bones
• absorbs shock and allows friction free movement

Question 4

What is the structure and function of the joint capsule

Answer 4

• a fibrous sac with an inner synovial membrane

- enclosed and strengthens the joint secreting synovial fluid

Question 5

What is the structure and function of a bursa

Answer 5

• a closed fluid filled sac found where tendons rub over bones
• reduces friction between tendons and bones

Question 6

How does skeletal muscle contract

Answer 6

• nerve impulse initiated at the motor neurone cell body
• nerve impulse conducted down the axon of the motor neurone by a nerve action potential to the synaptic cleft
• neurotransmitter is secreted into the synaptic cleft to conduct the nerve impulse across the gap
• if the electrical charge is above threshold the muscle fibre will contract
• this happens in all or none law