Muscular System 1

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 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 neurotransmitter that signals muscle contraction is called...

• Ach

• Myosin

• Actin

• Calcium

The mechanism of muscle contraction.

• 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

Calcium:

• causes ATP binding to actin

• increases the action potential along the sarcolemma

• binds to proteins on myosin

• triggers the binding of myosin to actin

The functional unit of the muscle cell is the: 

• Sarcomere

• Osteon

• Myofilament

• Muscle fiber

enzyme that breaks down the muscle cell neurotransmitter and ends the impulse

• lactase

• sucrase

• lipase

• acetylcholinterase