Coordinated Movement in Muscles

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Describe how a pair of muscles work antagonistically to each other
As one of the muscles in the pairs contracts, the other muscle will relax to allow movement.
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Provide an example of a synovial joint and describe what it is
Elbow joint. Synovial joint is the most flexible of all joints.
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Function of the tendons
The tendons connect bone to muscle. They are very strong and inelastic.
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Purpose of the ligaments
The ligaments hold the bones in place in the joint.
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What does the articular cartilage do?
Acts as a shock absorber.
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Function of the synovial fluid
This lubricates the joints. Allows ease of movement of the bones at the joints.
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Purpose of the synovial membrane
Joins with the fibrous capsule to form the articular capsule.
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How do the triceps and biceps work?
They work antagonistically to each other in order to move the forearm at the elbow.
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1st step of the operation of the neuromuscular junction.
Impulses arriving at the junction cause vesicles to fuse with the pre-synaptic membrane and release acetylcholine into the gap.
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2nd step of neuromuscular junction
Acetylcholine binds to receptors of muscle fibre membrane (sarcolemma) causing depolarisation.
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3rd step
Depolarisation wave travel down the tubules (T system).
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4th stage
T system depolarisation leads to Ca2+ release from stores in sarcoplasmic reticulum (specialised endoplasmic reticulum).
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5th step of operation at neuromuscular junction
Ca2+ binds to proteins in the muscle, leading to contraction.
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6th stage
Acetylcholinesterase in the gap rapidly breaks down acetylcholine so contraction only occurs when impulses arrive continuously.
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Other cards in this set

Card 2

Front

Provide an example of a synovial joint and describe what it is

Back

Elbow joint. Synovial joint is the most flexible of all joints.

Card 3

Front

Function of the tendons

Back

Preview of the front of card 3

Card 4

Front

Purpose of the ligaments

Back

Preview of the front of card 4

Card 5

Front

What does the articular cartilage do?

Back

Preview of the front of card 5
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