Muscular Quiz 3

Function of a sarcomere

• Made up of myofilaments

• The basic contractile unit of muscle contraction

• An organelle

• An organ

What two chemicals are necessary for muscle contraction to occur?

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

___ and ___ are regulatory (control) proteins bound to actin.

• Troponin and tropomyosin

• Myosin and actin

• Calcium and Oxygen

• Glycogen and hemoglobin

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

• Muscle cell
• Neuron
• Gland
• None of the above

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

• Sarcoplasm
• Sarcolemma
• Sarcoplasmic Reticulum
• Myoglobin

The "theory" of muscle contraction. (How we describe the process)

• sarcoplasmic reticulum

• fasciitis

• sliding filament mechanism

• muscle cramps

Region where a motor neuron comes in close contact with a muscle cell.

• neurotransmitter
• muscular dystrophy
• muscle tension
• neuromuscular junction

What protein is wrapped around actin that prevents it from contacting myosin

• Troponin
• Tropomyosin
• Calcium
• None of the above

An action potential is:

• an electrical signal sent in neurons and muscle fibers used to transmit messages.
• an electrical signal sent only in muscle fibers used to create a contraction.
• a property of muscle fibers that allows contraction to occur.
• a specialized structure found within the muscle fiber that is used for contraction.

During the first phase of contraction, what leaves the neuron and binds to the muscle fiber?

• A neurotransmitter called Acetylcholine (ACh)
• Calcium ions
• Sodium ions
• An action potential