Muscle Contraction Review

What two chemicals are necessary for muscle contraction to occur?

• Niacin and Potassium
• Calcium and ATP
• Sodium and Potassium
• Ach and Potassium

Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.  

• Muscle cell
• Motor Neuron
• Sensory Neuron
• None of the above

What is the structure that stores the Calcium in the muscle cell.  

• Sarcoplasm
• Sarcolemma
• Sarcoplasmic Reticulum
• Myoglobin

The neurotransmitter that signals muscle contraction is called...

• Acytelcholine
• Myosin
• ATP
• Calcium

What is necessary for the myosin to release the actin?

• ATP
• ADP
• Calcium
• Sodium

What does calcium do to the actin?

• Covers myosin binding sites
• Uncovers myosin binding sites
• Covers actin binding sites
• Uncovers actin binding sites

_______________ - muscles change length as they contract. It can either shorten the muscle or lengthen it. 

• Isometric contractions
• Isotonic contractions
• Concentric contraction
• Eccentric contraction

_______________ - muscle contract, but stay the same length. An example is the muscles in the vertebral column that maintain the body's posture. 

• Isometric contractions
• Isotonic contractions
• Eccentric contractions
• Concentric contraction

A wall sit is an example of which type of contraction?

• Eccentric
• Concentric
• Isometric

Z represents

• Dendrite
• Axon Terminal
• Neurotransmitters
• Synapse